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Merge work:/home/bk/mysql

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into mysql.sashanet.com:/home/sasha/src/bk/mysql
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2001-04-10 10:21:27 -06:00
parent 9b55716a5b 494a3a0fc7
commit 6b464d84ce
9 changed files with 197 additions and 75 deletions
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28
mysql-test/r/null_key.result
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@ -92,3 +92,31 @@ NULL 9 0
NULL 9 0
a b c
6 6 0
table type possible_keys key key_len ref rows Extra
t1 ref idx1 idx1 5 const 1 where used
table type possible_keys key key_len ref rows Extra
t1 const idx1 idx1 5 const 1
id
101
102
105
106
109
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id
101
102
105
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109
110
id uniq_id
3 1
4 2
7 3
8 4
id uniq_id
3 1
4 2
7 3
8 4

46
mysql-test/t/null_key.test
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@ -45,3 +45,49 @@ select * from t1 where (a is null or a = 7) and b=7 and c=0;
select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
select * from t1 where b like "6%";
drop table t1;
#
# The following failed for Matt Loschert
#
DROP TABLE IF EXISTS t1,t2;
CREATE TABLE t1 (
id int(10) unsigned NOT NULL auto_increment,
uniq_id int(10) unsigned default NULL,
PRIMARY KEY (id),
UNIQUE KEY idx1 (uniq_id)
) TYPE=MyISAM;
CREATE TABLE t2 (
id int(10) unsigned NOT NULL auto_increment,
uniq_id int(10) unsigned default NULL,
PRIMARY KEY (id)
) TYPE=MyISAM;
INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
#
# Check IS NULL optimization
#
explain select id from t1 where uniq_id is null;
explain select id from t1 where uniq_id =1;
#
# Check updates
#
UPDATE t1 SET id=id+100 where uniq_id is null;
UPDATE t2 SET id=id+100 where uniq_id is null;
select id from t1 where uniq_id is null;
select id from t2 where uniq_id is null;
#
# Delete all records from each table where the uniq_id field is null
#
DELETE FROM t1 WHERE uniq_id IS NULL;
DELETE FROM t2 WHERE uniq_id IS NULL;
#
# Select what is left -- notice the difference
#
SELECT * FROM t1 ORDER BY uniq_id, id;
SELECT * FROM t2 ORDER BY uniq_id, id;
DROP table t1,t2;