SELECT * FROM information_schema.columns WHERE table_schema = 'mysql' ORDER BY table_schema, table_name, column_name; TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME ORDINAL_POSITION COLUMN_DEFAULT IS_NULLABLE DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH NUMERIC_PRECISION NUMERIC_SCALE CHARACTER_SET_NAME COLLATION_NAME COLUMN_TYPE COLUMN_KEY EXTRA PRIVILEGES COLUMN_COMMENT NULL mysql columns_priv Column_name 5 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql columns_priv Column_priv 7 NO set 31 93 NULL NULL utf8 utf8_general_ci set('Select','Insert','Update','References') select,insert,update,references NULL mysql columns_priv Db 2 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql columns_priv Host 1 NO char 60 180 NULL NULL utf8 utf8_bin char(60) PRI select,insert,update,references NULL mysql columns_priv Table_name 4 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql columns_priv Timestamp 6 CURRENT_TIMESTAMP NO timestamp NULL NULL NULL NULL NULL NULL timestamp select,insert,update,references NULL mysql columns_priv User 3 NO char 16 48 NULL NULL utf8 utf8_bin char(16) PRI select,insert,update,references NULL mysql db Alter_priv 13 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Alter_routine_priv 19 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Create_priv 8 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Create_routine_priv 18 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Create_tmp_table_priv 14 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Create_view_priv 16 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Db 2 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql db Delete_priv 7 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Drop_priv 9 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Execute_priv 20 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Grant_priv 10 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Host 1 NO char 60 180 NULL NULL utf8 utf8_bin char(60) PRI select,insert,update,references NULL mysql db Index_priv 12 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Insert_priv 5 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Lock_tables_priv 15 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db References_priv 11 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Select_priv 4 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Show_view_priv 17 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db Update_priv 6 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql db User 3 NO char 16 48 NULL NULL utf8 utf8_bin char(16) PRI select,insert,update,references NULL mysql func dl 3 NO char 128 384 NULL NULL utf8 utf8_bin char(128) select,insert,update,references NULL mysql func name 1 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql func ret 2 0 NO tinyint NULL NULL 3 0 NULL NULL tinyint(1) select,insert,update,references NULL mysql func type 4 NULL NO enum 9 27 NULL NULL utf8 utf8_general_ci enum('function','aggregate') select,insert,update,references NULL mysql help_category help_category_id 1 NULL NO smallint NULL NULL 5 0 NULL NULL smallint(5) unsigned PRI select,insert,update,references NULL mysql help_category name 2 NULL NO char 64 192 NULL NULL utf8 utf8_general_ci char(64) UNI select,insert,update,references NULL mysql help_category parent_category_id 3 NULL YES smallint NULL NULL 5 0 NULL NULL smallint(5) unsigned select,insert,update,references NULL mysql help_category url 4 NULL NO char 128 384 NULL NULL utf8 utf8_general_ci char(128) select,insert,update,references NULL mysql help_keyword help_keyword_id 1 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI select,insert,update,references NULL mysql help_keyword name 2 NULL NO char 64 192 NULL NULL utf8 utf8_general_ci char(64) UNI select,insert,update,references NULL mysql help_relation help_keyword_id 2 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI select,insert,update,references NULL mysql help_relation help_topic_id 1 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI select,insert,update,references NULL mysql help_topic description 4 NULL NO text 65535 65535 NULL NULL utf8 utf8_general_ci text select,insert,update,references NULL mysql help_topic example 5 NULL NO text 65535 65535 NULL NULL utf8 utf8_general_ci text select,insert,update,references NULL mysql help_topic help_category_id 3 NULL NO smallint NULL NULL 5 0 NULL NULL smallint(5) unsigned select,insert,update,references NULL mysql help_topic help_topic_id 1 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI select,insert,update,references NULL mysql help_topic name 2 NULL NO char 64 192 NULL NULL utf8 utf8_general_ci char(64) UNI select,insert,update,references NULL mysql help_topic url 6 NULL NO char 128 384 NULL NULL utf8 utf8_general_ci char(128) select,insert,update,references NULL mysql host Alter_priv 12 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Alter_routine_priv 18 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Create_priv 7 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Create_routine_priv 17 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Create_tmp_table_priv 13 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Create_view_priv 15 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Db 2 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql host Delete_priv 6 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Drop_priv 8 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Execute_priv 19 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Grant_priv 9 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Host 1 NO char 60 180 NULL NULL utf8 utf8_bin char(60) PRI select,insert,update,references NULL mysql host Index_priv 11 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Insert_priv 4 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Lock_tables_priv 14 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host References_priv 10 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Select_priv 3 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Show_view_priv 16 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql host Update_priv 5 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql proc body 11 NULL NO longblob 4294967295 4294967295 NULL NULL NULL NULL longblob select,insert,update,references NULL mysql proc comment 16 NO char 64 192 NULL NULL utf8 utf8_bin char(64) select,insert,update,references NULL mysql proc created 13 CURRENT_TIMESTAMP NO timestamp NULL NULL NULL NULL NULL NULL timestamp select,insert,update,references NULL mysql proc db 1 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql proc definer 12 NO char 77 231 NULL NULL utf8 utf8_bin char(77) select,insert,update,references NULL mysql proc is_deterministic 7 NO NO enum 3 9 NULL NULL utf8 utf8_general_ci enum('YES','NO') select,insert,update,references NULL mysql proc language 5 SQL NO enum 3 9 NULL NULL utf8 utf8_general_ci enum('SQL') select,insert,update,references NULL mysql proc modified 14 0000-00-00 00:00:00 NO timestamp NULL NULL NULL NULL NULL NULL timestamp select,insert,update,references NULL mysql proc name 2 NO char 64 192 NULL NULL utf8 utf8_general_ci char(64) PRI select,insert,update,references NULL mysql proc param_list 9 NULL NO blob 65535 65535 NULL NULL NULL NULL blob select,insert,update,references NULL mysql proc returns 10 NO char 64 192 NULL NULL utf8 utf8_general_ci char(64) select,insert,update,references NULL mysql proc security_type 8 DEFINER NO enum 7 21 NULL NULL utf8 utf8_general_ci enum('INVOKER','DEFINER') select,insert,update,references NULL mysql proc specific_name 4 NO char 64 192 NULL NULL utf8 utf8_general_ci char(64) select,insert,update,references NULL mysql proc sql_data_access 6 CONTAINS_SQL NO enum 17 51 NULL NULL utf8 utf8_general_ci enum('CONTAINS_SQL','NO_SQL','READS_SQL_DATA','MODIFIES_SQL_DATA') select,insert,update,references NULL mysql proc sql_mode 15 NO set 431 1293 NULL NULL utf8 utf8_general_ci set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE') select,insert,update,references NULL mysql proc type 3 NULL NO enum 9 27 NULL NULL utf8 utf8_general_ci enum('FUNCTION','PROCEDURE') PRI select,insert,update,references NULL mysql procs_priv Db 2 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql procs_priv Grantor 6 NO char 77 231 NULL NULL utf8 utf8_bin char(77) MUL select,insert,update,references NULL mysql procs_priv Host 1 NO char 60 180 NULL NULL utf8 utf8_bin char(60) PRI select,insert,update,references NULL mysql procs_priv Proc_priv 7 NO set 27 81 NULL NULL utf8 utf8_general_ci set('Execute','Alter Routine','Grant') select,insert,update,references NULL mysql procs_priv Routine_name 4 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql procs_priv Routine_type 5 NULL NO enum 9 27 NULL NULL utf8 utf8_bin enum('FUNCTION','PROCEDURE') PRI select,insert,update,references NULL mysql procs_priv Timestamp 8 CURRENT_TIMESTAMP NO timestamp NULL NULL NULL NULL NULL NULL timestamp select,insert,update,references NULL mysql procs_priv User 3 NO char 16 48 NULL NULL utf8 utf8_bin char(16) PRI select,insert,update,references NULL mysql tables_priv Column_priv 8 NO set 31 93 NULL NULL utf8 utf8_general_ci set('Select','Insert','Update','References') select,insert,update,references NULL mysql tables_priv Db 2 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql tables_priv Grantor 5 NO char 77 231 NULL NULL utf8 utf8_bin char(77) MUL select,insert,update,references NULL mysql tables_priv Host 1 NO char 60 180 NULL NULL utf8 utf8_bin char(60) PRI select,insert,update,references NULL mysql tables_priv Table_name 4 NO char 64 192 NULL NULL utf8 utf8_bin char(64) PRI select,insert,update,references NULL mysql tables_priv Table_priv 7 NO set 90 270 NULL NULL utf8 utf8_general_ci set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter','Create View','Show view') select,insert,update,references NULL mysql tables_priv Timestamp 6 CURRENT_TIMESTAMP NO timestamp NULL NULL NULL NULL NULL NULL timestamp select,insert,update,references NULL mysql tables_priv User 3 NO char 16 48 NULL NULL utf8 utf8_bin char(16) PRI select,insert,update,references NULL mysql time_zone Time_zone_id 1 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI auto_increment select,insert,update,references NULL mysql time_zone Use_leap_seconds 2 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('Y','N') select,insert,update,references NULL mysql time_zone_leap_second Correction 2 NULL NO int NULL NULL 10 0 NULL NULL int(11) select,insert,update,references NULL mysql time_zone_leap_second Transition_time 1 NULL NO bigint NULL NULL 19 0 NULL NULL bigint(20) PRI select,insert,update,references NULL mysql time_zone_name Name 1 NULL NO char 64 192 NULL NULL utf8 utf8_general_ci char(64) PRI select,insert,update,references NULL mysql time_zone_name Time_zone_id 2 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned select,insert,update,references NULL mysql time_zone_transition Time_zone_id 1 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI select,insert,update,references NULL mysql time_zone_transition Transition_time 2 NULL NO bigint NULL NULL 19 0 NULL NULL bigint(20) PRI select,insert,update,references NULL mysql time_zone_transition Transition_type_id 3 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned select,insert,update,references NULL mysql time_zone_transition_type Abbreviation 5 NO char 8 24 NULL NULL utf8 utf8_general_ci char(8) select,insert,update,references NULL mysql time_zone_transition_type Is_DST 4 0 NO tinyint NULL NULL 3 0 NULL NULL tinyint(3) unsigned select,insert,update,references NULL mysql time_zone_transition_type Offset 3 0 NO int NULL NULL 10 0 NULL NULL int(11) select,insert,update,references NULL mysql time_zone_transition_type Time_zone_id 1 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI select,insert,update,references NULL mysql time_zone_transition_type Transition_type_id 2 NULL NO int NULL NULL 10 0 NULL NULL int(10) unsigned PRI select,insert,update,references NULL mysql user Alter_priv 17 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Alter_routine_priv 28 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Create_priv 8 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Create_routine_priv 27 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Create_tmp_table_priv 20 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Create_user_priv 29 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Create_view_priv 25 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Delete_priv 7 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Drop_priv 9 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Execute_priv 22 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user File_priv 13 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Grant_priv 14 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Host 1 NO char 60 180 NULL NULL utf8 utf8_bin char(60) PRI select,insert,update,references NULL mysql user Index_priv 16 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Insert_priv 5 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Lock_tables_priv 21 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user max_connections 36 0 NO int NULL NULL 10 0 NULL NULL int(11) unsigned select,insert,update,references NULL mysql user max_questions 34 0 NO int NULL NULL 10 0 NULL NULL int(11) unsigned select,insert,update,references NULL mysql user max_updates 35 0 NO int NULL NULL 10 0 NULL NULL int(11) unsigned select,insert,update,references NULL mysql user max_user_connections 37 0 NO int NULL NULL 10 0 NULL NULL int(11) unsigned select,insert,update,references NULL mysql user Password 3 NO char 41 41 NULL NULL latin1 latin1_bin char(41) select,insert,update,references NULL mysql user Process_priv 12 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user References_priv 15 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Reload_priv 10 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Repl_client_priv 24 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Repl_slave_priv 23 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Select_priv 4 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Show_db_priv 18 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Show_view_priv 26 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Shutdown_priv 11 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user ssl_cipher 31 NULL NO blob 65535 65535 NULL NULL NULL NULL blob select,insert,update,references NULL mysql user ssl_type 30 NO enum 9 27 NULL NULL utf8 utf8_general_ci enum('','ANY','X509','SPECIFIED') select,insert,update,references NULL mysql user Super_priv 19 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user Update_priv 6 N NO enum 1 3 NULL NULL utf8 utf8_general_ci enum('N','Y') select,insert,update,references NULL mysql user User 2 NO char 16 48 NULL NULL utf8 utf8_bin char(16) PRI select,insert,update,references NULL mysql user x509_issuer 32 NULL NO blob 65535 65535 NULL NULL NULL NULL blob select,insert,update,references NULL mysql user x509_subject 33 NULL NO blob 65535 65535 NULL NULL NULL NULL blob select,insert,update,references ########################################################################## # Show the quotient of CHARACTER_OCTET_LENGTH and CHARACTER_MAXIMUM_LENGTH ########################################################################## SELECT DISTINCT CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML, DATA_TYPE, CHARACTER_SET_NAME, COLLATION_NAME FROM information_schema.columns WHERE table_schema = 'mysql' AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH = 1 ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML; COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME 1.0000 blob NULL NULL 1.0000 longblob NULL NULL 1.0000 char latin1 latin1_bin 1.0000 text utf8 utf8_general_ci SELECT DISTINCT CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML, DATA_TYPE, CHARACTER_SET_NAME, COLLATION_NAME FROM information_schema.columns WHERE table_schema = 'mysql' AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH <> 1 ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML; COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME 3.0000 char utf8 utf8_bin 3.0000 enum utf8 utf8_bin 3.0000 char utf8 utf8_general_ci 3.0000 enum utf8 utf8_general_ci 3.0000 set utf8 utf8_general_ci SELECT DISTINCT CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML, DATA_TYPE, CHARACTER_SET_NAME, COLLATION_NAME FROM information_schema.columns WHERE table_schema = 'mysql' AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH IS NULL ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML; COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME NULL bigint NULL NULL NULL int NULL NULL NULL smallint NULL NULL NULL timestamp NULL NULL NULL tinyint NULL NULL --> CHAR(0) is allowed (see manual), and here both CHARACHTER_* values --> are 0, which is intended behavior, and the result of 0 / 0 IS NULL SELECT CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, CHARACTER_OCTET_LENGTH, CHARACTER_SET_NAME, COLLATION_NAME, COLUMN_TYPE FROM information_schema.columns WHERE table_schema = 'mysql' ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION; COL_CML TABLE_SCHEMA TABLE_NAME COLUMN_NAME DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH CHARACTER_SET_NAME COLLATION_NAME COLUMN_TYPE 3.0000 mysql columns_priv Host char 60 180 utf8 utf8_bin char(60) 3.0000 mysql columns_priv Db char 64 192 utf8 utf8_bin char(64) 3.0000 mysql columns_priv User char 16 48 utf8 utf8_bin char(16) 3.0000 mysql columns_priv Table_name char 64 192 utf8 utf8_bin char(64) 3.0000 mysql columns_priv Column_name char 64 192 utf8 utf8_bin char(64) NULL mysql columns_priv Timestamp timestamp NULL NULL NULL NULL timestamp 3.0000 mysql columns_priv Column_priv set 31 93 utf8 utf8_general_ci set('Select','Insert','Update','References') 3.0000 mysql db Host char 60 180 utf8 utf8_bin char(60) 3.0000 mysql db Db char 64 192 utf8 utf8_bin char(64) 3.0000 mysql db User char 16 48 utf8 utf8_bin char(16) 3.0000 mysql db Select_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Insert_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Update_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Delete_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Create_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Drop_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Grant_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db References_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Index_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Alter_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Create_tmp_table_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Lock_tables_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Create_view_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Show_view_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Create_routine_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Alter_routine_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql db Execute_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql func name char 64 192 utf8 utf8_bin char(64) NULL mysql func ret tinyint NULL NULL NULL NULL tinyint(1) 3.0000 mysql func dl char 128 384 utf8 utf8_bin char(128) 3.0000 mysql func type enum 9 27 utf8 utf8_general_ci enum('function','aggregate') NULL mysql help_category help_category_id smallint NULL NULL NULL NULL smallint(5) unsigned 3.0000 mysql help_category name char 64 192 utf8 utf8_general_ci char(64) NULL mysql help_category parent_category_id smallint NULL NULL NULL NULL smallint(5) unsigned 3.0000 mysql help_category url char 128 384 utf8 utf8_general_ci char(128) NULL mysql help_keyword help_keyword_id int NULL NULL NULL NULL int(10) unsigned 3.0000 mysql help_keyword name char 64 192 utf8 utf8_general_ci char(64) NULL mysql help_relation help_topic_id int NULL NULL NULL NULL int(10) unsigned NULL mysql help_relation help_keyword_id int NULL NULL NULL NULL int(10) unsigned NULL mysql help_topic help_topic_id int NULL NULL NULL NULL int(10) unsigned 3.0000 mysql help_topic name char 64 192 utf8 utf8_general_ci char(64) NULL mysql help_topic help_category_id smallint NULL NULL NULL NULL smallint(5) unsigned 1.0000 mysql help_topic description text 65535 65535 utf8 utf8_general_ci text 1.0000 mysql help_topic example text 65535 65535 utf8 utf8_general_ci text 3.0000 mysql help_topic url char 128 384 utf8 utf8_general_ci char(128) 3.0000 mysql host Host char 60 180 utf8 utf8_bin char(60) 3.0000 mysql host Db char 64 192 utf8 utf8_bin char(64) 3.0000 mysql host Select_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Insert_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Update_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Delete_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Create_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Drop_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Grant_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host References_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Index_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Alter_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Create_tmp_table_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Lock_tables_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Create_view_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Show_view_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Create_routine_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Alter_routine_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql host Execute_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql proc db char 64 192 utf8 utf8_bin char(64) 3.0000 mysql proc name char 64 192 utf8 utf8_general_ci char(64) 3.0000 mysql proc type enum 9 27 utf8 utf8_general_ci enum('FUNCTION','PROCEDURE') 3.0000 mysql proc specific_name char 64 192 utf8 utf8_general_ci char(64) 3.0000 mysql proc language enum 3 9 utf8 utf8_general_ci enum('SQL') 3.0000 mysql proc sql_data_access enum 17 51 utf8 utf8_general_ci enum('CONTAINS_SQL','NO_SQL','READS_SQL_DATA','MODIFIES_SQL_DATA') 3.0000 mysql proc is_deterministic enum 3 9 utf8 utf8_general_ci enum('YES','NO') 3.0000 mysql proc security_type enum 7 21 utf8 utf8_general_ci enum('INVOKER','DEFINER') 1.0000 mysql proc param_list blob 65535 65535 NULL NULL blob 3.0000 mysql proc returns char 64 192 utf8 utf8_general_ci char(64) 1.0000 mysql proc body longblob 4294967295 4294967295 NULL NULL longblob 3.0000 mysql proc definer char 77 231 utf8 utf8_bin char(77) NULL mysql proc created timestamp NULL NULL NULL NULL timestamp NULL mysql proc modified timestamp NULL NULL NULL NULL timestamp 3.0000 mysql proc sql_mode set 431 1293 utf8 utf8_general_ci set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE') 3.0000 mysql proc comment char 64 192 utf8 utf8_bin char(64) 3.0000 mysql procs_priv Host char 60 180 utf8 utf8_bin char(60) 3.0000 mysql procs_priv Db char 64 192 utf8 utf8_bin char(64) 3.0000 mysql procs_priv User char 16 48 utf8 utf8_bin char(16) 3.0000 mysql procs_priv Routine_name char 64 192 utf8 utf8_bin char(64) 3.0000 mysql procs_priv Routine_type enum 9 27 utf8 utf8_bin enum('FUNCTION','PROCEDURE') 3.0000 mysql procs_priv Grantor char 77 231 utf8 utf8_bin char(77) 3.0000 mysql procs_priv Proc_priv set 27 81 utf8 utf8_general_ci set('Execute','Alter Routine','Grant') NULL mysql procs_priv Timestamp timestamp NULL NULL NULL NULL timestamp 3.0000 mysql tables_priv Host char 60 180 utf8 utf8_bin char(60) 3.0000 mysql tables_priv Db char 64 192 utf8 utf8_bin char(64) 3.0000 mysql tables_priv User char 16 48 utf8 utf8_bin char(16) 3.0000 mysql tables_priv Table_name char 64 192 utf8 utf8_bin char(64) 3.0000 mysql tables_priv Grantor char 77 231 utf8 utf8_bin char(77) NULL mysql tables_priv Timestamp timestamp NULL NULL NULL NULL timestamp 3.0000 mysql tables_priv Table_priv set 90 270 utf8 utf8_general_ci set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter','Create View','Show view') 3.0000 mysql tables_priv Column_priv set 31 93 utf8 utf8_general_ci set('Select','Insert','Update','References') NULL mysql time_zone Time_zone_id int NULL NULL NULL NULL int(10) unsigned 3.0000 mysql time_zone Use_leap_seconds enum 1 3 utf8 utf8_general_ci enum('Y','N') NULL mysql time_zone_leap_second Transition_time bigint NULL NULL NULL NULL bigint(20) NULL mysql time_zone_leap_second Correction int NULL NULL NULL NULL int(11) 3.0000 mysql time_zone_name Name char 64 192 utf8 utf8_general_ci char(64) NULL mysql time_zone_name Time_zone_id int NULL NULL NULL NULL int(10) unsigned NULL mysql time_zone_transition Time_zone_id int NULL NULL NULL NULL int(10) unsigned NULL mysql time_zone_transition Transition_time bigint NULL NULL NULL NULL bigint(20) NULL mysql time_zone_transition Transition_type_id int NULL NULL NULL NULL int(10) unsigned NULL mysql time_zone_transition_type Time_zone_id int NULL NULL NULL NULL int(10) unsigned NULL mysql time_zone_transition_type Transition_type_id int NULL NULL NULL NULL int(10) unsigned NULL mysql time_zone_transition_type Offset int NULL NULL NULL NULL int(11) NULL mysql time_zone_transition_type Is_DST tinyint NULL NULL NULL NULL tinyint(3) unsigned 3.0000 mysql time_zone_transition_type Abbreviation char 8 24 utf8 utf8_general_ci char(8) 3.0000 mysql user Host char 60 180 utf8 utf8_bin char(60) 3.0000 mysql user User char 16 48 utf8 utf8_bin char(16) 1.0000 mysql user Password char 41 41 latin1 latin1_bin char(41) 3.0000 mysql user Select_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Insert_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Update_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Delete_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Create_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Drop_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Reload_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Shutdown_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Process_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user File_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Grant_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user References_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Index_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Alter_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Show_db_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Super_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Create_tmp_table_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Lock_tables_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Execute_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Repl_slave_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Repl_client_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Create_view_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Show_view_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Create_routine_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Alter_routine_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user Create_user_priv enum 1 3 utf8 utf8_general_ci enum('N','Y') 3.0000 mysql user ssl_type enum 9 27 utf8 utf8_general_ci enum('','ANY','X509','SPECIFIED') 1.0000 mysql user ssl_cipher blob 65535 65535 NULL NULL blob 1.0000 mysql user x509_issuer blob 65535 65535 NULL NULL blob 1.0000 mysql user x509_subject blob 65535 65535 NULL NULL blob NULL mysql user max_questions int NULL NULL NULL NULL int(11) unsigned NULL mysql user max_updates int NULL NULL NULL NULL int(11) unsigned NULL mysql user max_connections int NULL NULL NULL NULL int(11) unsigned NULL mysql user max_user_connections int NULL NULL NULL NULL int(11) unsigned