File: key_diff.result

package info (click to toggle)
mariadb 1%3A11.8.3-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 772,520 kB
  • sloc: ansic: 2,414,714; cpp: 1,791,394; asm: 381,336; perl: 62,905; sh: 49,647; pascal: 40,897; java: 39,363; python: 20,791; yacc: 20,432; sql: 17,907; xml: 12,344; ruby: 8,544; cs: 6,542; makefile: 6,145; ada: 1,879; lex: 1,193; javascript: 996; objc: 80; tcl: 73; awk: 46; php: 22
file content (52 lines) | stat: -rw-r--r-- 820 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
 
drop table if exists t1;
CREATE TABLE t1 (
a char(5) NOT NULL,
b char(4) NOT NULL,
KEY (a),
KEY (b)
);
INSERT INTO t1 VALUES ('A','B'),('b','A'),('C','c'),('D','E'),('a','a');
select * from t1,t1 as t2;
a	b	a	b
A	B	A	B
b	A	A	B
C	c	A	B
D	E	A	B
a	a	A	B
A	B	b	A
b	A	b	A
C	c	b	A
D	E	b	A
a	a	b	A
A	B	C	c
b	A	C	c
C	c	C	c
D	E	C	c
a	a	C	c
A	B	D	E
b	A	D	E
C	c	D	E
D	E	D	E
a	a	D	E
A	B	a	a
b	A	a	a
C	c	a	a
D	E	a	a
a	a	a	a
explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	
1	SIMPLE	t2	ref	b	b	16	test.t1.a	1	Using index condition
select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
a	b	a	b
A	B	a	a
A	B	b	A
C	c	C	c
a	a	a	a
a	a	b	A
b	A	A	B
select * from t1 where a='a';
a	b
A	B
a	a
drop table t1;