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51 lines
1.8 KiB
Plaintext
51 lines
1.8 KiB
Plaintext
SET sql_mode=ORACLE;
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SELECT SUBSTR('abc',2,1),SUBSTR('abc',1,1), SUBSTR('abc',0,1) FROM dual;
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SUBSTR('abc',2,1) SUBSTR('abc',1,1) SUBSTR('abc',0,1)
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b a a
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SELECT SUBSTR('abc',2),SUBSTR('abc',1), SUBSTR('abc',0) FROM dual;
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SUBSTR('abc',2) SUBSTR('abc',1) SUBSTR('abc',0)
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bc abc abc
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SELECT SUBSTR(null,2,1),SUBSTR(null,1), SUBSTR(null,0) FROM dual;
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SUBSTR(null,2,1) SUBSTR(null,1) SUBSTR(null,0)
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NULL NULL NULL
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SELECT SUBSTR('abc',-2),SUBSTR('abc',-1), SUBSTR('abc',-0) FROM dual;
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SUBSTR('abc',-2) SUBSTR('abc',-1) SUBSTR('abc',-0)
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bc c abc
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SELECT SUBSTR('abc',-2,1),SUBSTR('abc',-1,1), SUBSTR('abc',-0,1) FROM dual;
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SUBSTR('abc',-2,1) SUBSTR('abc',-1,1) SUBSTR('abc',-0,1)
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b c a
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SELECT SUBSTR('abc',null) FROM dual;
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SUBSTR('abc',null)
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NULL
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SELECT SUBSTR('abc',2,null),SUBSTR('abc',1,null), SUBSTR('abc',0,null) FROM dual;
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SUBSTR('abc',2,null) SUBSTR('abc',1,null) SUBSTR('abc',0,null)
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NULL NULL NULL
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SELECT SUBSTR('abc',2,0),SUBSTR('abc',1,0), SUBSTR('abc',0,0) FROM dual;
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SUBSTR('abc',2,0) SUBSTR('abc',1,0) SUBSTR('abc',0,0)
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create table t1 (c1 varchar(10),start integer, length integer);
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INSERT INTO t1 VALUES ('abc', 1, 1);
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INSERT INTO t1 VALUES ('abc', 0, 1);
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INSERT INTO t1 VALUES (null, 1, 1);
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INSERT INTO t1 VALUES (null, 0, 1);
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select substr(c1,start,length) from t1;
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substr(c1,start,length)
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a
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a
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NULL
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NULL
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drop table t1;
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EXPLAIN EXTENDED SELECT SUBSTR('abc',2,1) ;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select substr_oracle('abc',2,1) AS "SUBSTR('abc',2,1)"
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CREATE VIEW v1 AS SELECT SUBSTR('abc',2,1) ;
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SHOW CREATE VIEW v1;
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View Create View character_set_client collation_connection
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v1 CREATE VIEW "v1" AS select substr_oracle('abc',2,1) AS "SUBSTR('abc',2,1)" latin1 latin1_swedish_ci
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SELECT * FROM v1;
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SUBSTR('abc',2,1)
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b
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DROP VIEW v1;
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