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			99 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
			
		
		
	
	
			99 lines
		
	
	
		
			3.0 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
| drop table if exists t1;
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| CREATE TABLE t1 (id CHAR(12) not null, PRIMARY KEY (id));
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| insert into t1 values ('000000000001'),('000000000002');
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| explain select * from t1 where id=000000000001;
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| id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
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| 1	SIMPLE	t1	index	PRIMARY	PRIMARY	12	NULL	2	Using where; Using index
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| select * from t1 where id=000000000001;
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| id
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| 000000000001
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| delete from t1 where id=000000000002;
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| select * from t1;
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| id
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| 000000000001
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| drop table t1;
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| SELECT 'a' = 'a ';
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| 'a' = 'a '
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| 1
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| SELECT 'a\0' < 'a';
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| 'a\0' < 'a'
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| 1
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| SELECT 'a\0' < 'a ';
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| 'a\0' < 'a '
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| 1
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| SELECT 'a\t' < 'a';
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| 'a\t' < 'a'
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| 1
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| SELECT 'a\t' < 'a ';
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| 'a\t' < 'a '
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| 1
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| CREATE TABLE t1 (a char(10) not null);
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| INSERT INTO t1 VALUES ('a'),('a\0'),('a\t'),('a ');
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| SELECT hex(a),STRCMP(a,'a'), STRCMP(a,'a ') FROM t1;
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| hex(a)	STRCMP(a,'a')	STRCMP(a,'a ')
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| 61	0	0
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| 6100	-1	-1
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| 6109	-1	-1
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| 61	0	0
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| DROP TABLE t1;
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| SELECT CHAR(31) = '', '' = CHAR(31);
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| CHAR(31) = ''	'' = CHAR(31)
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| 0	0
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| SELECT CHAR(30) = '', '' = CHAR(30);
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| CHAR(30) = ''	'' = CHAR(30)
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| 0	0
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| create table t1 (a tinyint(1),b binary(1));
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| insert into t1 values (0x01,0x01);
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| select * from t1 where a=b;
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| a	b
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| Warnings:
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| Warning	1292	Truncated incorrect DOUBLE value: '\x01'
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| select * from t1 where a=b and b=0x01;
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| a	b
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| Warnings:
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| Warning	1292	Truncated incorrect DOUBLE value: '\x01'
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| drop table if exists t1;
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| CREATE TABLE  t1 (b int(2) zerofill, c int(2) zerofill);
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| INSERT INTO t1 (b,c) VALUES (1,2), (1,1), (2,2);
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| SELECT CONCAT(b,c), CONCAT(b,c) = '0101' FROM t1;
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| CONCAT(b,c)	CONCAT(b,c) = '0101'
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| 0102	0
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| 0101	1
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| 0202	0
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| EXPLAIN EXTENDED SELECT b,c FROM t1 WHERE b = 1 AND CONCAT(b,c) = '0101';
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| id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
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| 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
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| Warnings:
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| Note	1003	select `test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` where ((`test`.`t1`.`b` = 1) and (concat('01',`test`.`t1`.`c`) = '0101'))
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| SELECT b,c FROM t1 WHERE b = 1 AND CONCAT(b,c) = '0101';
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| b	c
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| 01	01
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| CREATE TABLE t2 (a int);
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| INSERT INTO t2 VALUES (1),(2);
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| SELECT a, 
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| (SELECT COUNT(*) FROM t1 
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| WHERE b = t2.a AND CONCAT(b,c) = CONCAT('0',t2.a,'01')) x 
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| FROM t2 ORDER BY a;
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| a	x
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| 1	1
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| 2	0
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| EXPLAIN EXTENDED 
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| SELECT a, 
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| (SELECT COUNT(*) FROM t1 
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| WHERE b = t2.a AND CONCAT(b,c) = CONCAT('0',t2.a,'01')) x 
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| FROM t2 ORDER BY a;
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| id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
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| 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using filesort
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| 2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
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| Warnings:
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| Note	1276	Field or reference 'test.t2.a' of SELECT #2 was resolved in SELECT #1
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| Note	1276	Field or reference 'test.t2.a' of SELECT #2 was resolved in SELECT #1
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| Note	1003	select `test`.`t2`.`a` AS `a`,(select count(0) from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t2`.`a`) and (concat(`test`.`t1`.`b`,`test`.`t1`.`c`) = concat('0',`test`.`t2`.`a`,'01')))) AS `x` from `test`.`t2` order by `test`.`t2`.`a`
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| DROP TABLE t1,t2;
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| CREATE TABLE t1 (a TIMESTAMP);
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| INSERT INTO t1 VALUES (NOW()),(NOW()),(NOW());
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| SELECT * FROM t1 WHERE a > '2008-01-01' AND a = '0000-00-00';
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| a
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| DROP TABLE t1;
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| End of 5.0 tests
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