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Docs/manual.texi: Updated replication section mysql-test/r/null_key.result: Added test UPDATE/DELETE with IS NULL on unique key mysql-test/t/null_key.test: Added test UPDATE/DELETE with IS NULL on unique key mysys/Makefile.am: Removed -f from $CP as this is not portable Fixed rule for testhash sql/field.cc: Safety fix sql/opt_range.cc: Fixed bug with UPDATE/DELETE on UNIQUE key which could be NULL sql/opt_range.h: Fixed bug with UPDATE/DELETE on UNIQUE key which could be NULL
94 lines
3.8 KiB
Plaintext
94 lines
3.8 KiB
Plaintext
#
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# Check null keys
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drop table if exists t1;
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create table t1 (a int, b int not null,unique key (a,b),index(b)) type=myisam;
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insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
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explain select * from t1 where a is null;
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explain select * from t1 where a is null and b = 2;
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explain select * from t1 where a is null and b = 7;
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explain select * from t1 where a=2 and b = 2;
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explain select * from t1 where a<=>b limit 2;
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explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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explain select * from t1 where (a is null or a = 7) and b=7;
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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explain select * from t1 where a > 1 and a < 3 limit 1;
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explain select * from t1 where a > 8 and a < 9;
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select * from t1 where a is null;
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select * from t1 where a is null and b = 7;
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select * from t1 where a<=>b limit 2;
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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select * from t1 where (a is null or a = 7) and b=7;
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10));
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explain select * from t1 where a is null and b = 2;
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explain select * from t1 where a is null and b = 2 and c=0;
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explain select * from t1 where a is null and b = 7 and c=0;
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explain select * from t1 where a=2 and b = 2;
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explain select * from t1 where a<=>b limit 2;
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explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
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explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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explain select * from t1 where a > 1 and a < 3 limit 1;
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explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 1;
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explain select * from t1 where a > 8 and a < 9;
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explain select * from t1 where b like "6%";
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select * from t1 where a is null;
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select * from t1 where a is null and b = 7 and c=0;
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select * from t1 where a<=>b limit 2;
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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select * from t1 where (a is null or a = 7) and b=7 and c=0;
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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select * from t1 where b like "6%";
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drop table t1;
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#
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# The following failed for Matt Loschert
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#
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DROP TABLE IF EXISTS t1,t2;
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CREATE TABLE t1 (
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id int(10) unsigned NOT NULL auto_increment,
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uniq_id int(10) unsigned default NULL,
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PRIMARY KEY (id),
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UNIQUE KEY idx1 (uniq_id)
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) TYPE=MyISAM;
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CREATE TABLE t2 (
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id int(10) unsigned NOT NULL auto_increment,
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uniq_id int(10) unsigned default NULL,
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PRIMARY KEY (id)
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) TYPE=MyISAM;
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INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
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INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
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#
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# Check IS NULL optimization
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#
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explain select id from t1 where uniq_id is null;
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explain select id from t1 where uniq_id =1;
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#
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# Check updates
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#
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UPDATE t1 SET id=id+100 where uniq_id is null;
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UPDATE t2 SET id=id+100 where uniq_id is null;
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select id from t1 where uniq_id is null;
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select id from t2 where uniq_id is null;
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#
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# Delete all records from each table where the uniq_id field is null
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#
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DELETE FROM t1 WHERE uniq_id IS NULL;
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DELETE FROM t2 WHERE uniq_id IS NULL;
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#
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# Select what is left -- notice the difference
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#
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SELECT * FROM t1 ORDER BY uniq_id, id;
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SELECT * FROM t2 ORDER BY uniq_id, id;
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DROP table t1,t2;
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