join.result

来自「视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.」· RESULT 代码 · 共 861 行 · 第 1/3 页

cust	20
drop table t1,t2;
CREATE TABLE t1 (ID INTEGER NOT NULL PRIMARY KEY, Value1 VARCHAR(255));
CREATE TABLE t2 (ID INTEGER NOT NULL PRIMARY KEY, Value2 VARCHAR(255));
INSERT INTO t1 VALUES (1, 'A');
INSERT INTO t2 VALUES (1, 'B');
SELECT * FROM t1 NATURAL JOIN t2 WHERE 1 AND (Value1 = 'A' AND Value2 <> 'B');
ID	Value1	Value2
SELECT * FROM t1 NATURAL JOIN t2 WHERE 1 AND Value1 = 'A' AND Value2 <> 'B';
ID	Value1	Value2
SELECT * FROM t1 NATURAL JOIN t2 WHERE (Value1 = 'A' AND Value2 <> 'B') AND 1;
ID	Value1	Value2
drop table t1,t2;
CREATE TABLE t1 (a int);
CREATE TABLE t2 (b int);
CREATE TABLE t3 (c int);
SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3;
a	b	c
DROP TABLE t1, t2, t3;
create table t1 (i int);
create table t2 (i int);
create table t3 (i int);
insert into t1 values(1),(2);
insert into t2 values(2),(3);
insert into t3 values (2),(4);
select * from t1 natural left join t2;
i
1
2
select * from t1 left join t2 on (t1.i=t2.i);
i	i
1	NULL
2	2
select * from t1 natural left join t2 natural left join t3;
i
1
2
select * from t1 left join t2 on (t1.i=t2.i) left join t3 on (t2.i=t3.i);
i	i	i
1	NULL	NULL
2	2	2
select * from t3 natural right join t2;
i
2
3
select * from t3 right join t2 on (t3.i=t2.i);
i	i
2	2
NULL	3
select * from t3 natural right join t2 natural right join t1;
i
1
2
select * from t3 right join t2 on (t3.i=t2.i) right join t1 on (t2.i=t1.i);
i	i	i
NULL	NULL	1
2	2	2
select * from t1,t2 natural left join t3 order by t1.i,t2.i,t3.i;
i	i
1	2
1	3
2	2
2	3
select * from t1,t2 left join t3 on (t2.i=t3.i) order by t1.i,t2.i,t3.i;
i	i	i
1	2	2
1	3	NULL
2	2	2
2	3	NULL
select t1.i,t2.i,t3.i from t2 natural left join t3,t1 order by t1.i,t2.i,t3.i;
i	i	i
1	2	2
1	3	NULL
2	2	2
2	3	NULL
select t1.i,t2.i,t3.i from t2 left join t3 on (t2.i=t3.i),t1 order by t1.i,t2.i,t3.i;
i	i	i
1	2	2
1	3	NULL
2	2	2
2	3	NULL
select * from t1,t2 natural right join t3 order by t1.i,t2.i,t3.i;
i	i
1	4
1	2
2	4
2	2
select * from t1,t2 right join t3 on (t2.i=t3.i) order by t1.i,t2.i,t3.i;
i	i	i
1	NULL	4
1	2	2
2	NULL	4
2	2	2
select t1.i,t2.i,t3.i from t2 natural right join t3,t1 order by t1.i,t2.i,t3.i;
i	i	i
1	NULL	4
1	2	2
2	NULL	4
2	2	2
select t1.i,t2.i,t3.i from t2 right join t3 on (t2.i=t3.i),t1 order by t1.i,t2.i,t3.i;
i	i	i
1	NULL	4
1	2	2
2	NULL	4
2	2	2
drop table t1,t2,t3;
CREATE TABLE t1 (a int, b int default 0, c int default 1);
INSERT INTO t1 (a) VALUES (1),(2),(3),(4),(5),(6),(7),(8);
INSERT INTO t1 (a) SELECT a + 8 FROM t1;
INSERT INTO t1 (a) SELECT a + 16 FROM t1;
CREATE TABLE t2 (a int, d int, e int default 0);
INSERT INTO t2 (a, d) VALUES (1,1),(2,2),(3,3),(4,4);
INSERT INTO t2 (a, d) SELECT a+4, a+4 FROM t2;
INSERT INTO t2 (a, d) SELECT a+8, a+8 FROM t2;
EXPLAIN
SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e
ORDER BY t1.b, t1.c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	32	Using temporary; Using filesort
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	16	Using where
SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e
ORDER BY t1.b, t1.c;
e
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DROP TABLE t1,t2;
create table t1 (c int, b int);
create table t2 (a int, b int);
create table t3 (b int, c int);
create table t4 (y int, c int);
create table t5 (y int, z int);
create table t6 (a int, c int);
insert into t1 values (10,1);
insert into t1 values (3 ,1);
insert into t1 values (3 ,2);
insert into t2 values (2, 1);
insert into t3 values (1, 3);
insert into t3 values (1,10);
insert into t4 values (11,3);
insert into t4 values (2, 3);
insert into t5 values (11,4);
insert into t6 values (2, 3);
create algorithm=merge view v1a as
select * from t1 natural join t2;
create algorithm=merge view v1b(a,b,c) as
select * from t1 natural join t2;
create algorithm=merge view v1c as
select b as a, c as b, a as c from t1 natural join t2;
create algorithm=merge view v1d(b, a, c) as
select a as c, c as b, b as a from t1 natural join t2;
create algorithm=merge view v2a as
select t1.c, t1.b, t2.a from t1 join (t2 join t4 on b + 1 = y) on t1.c = t4.c;
create algorithm=merge view v2b as
select t1.c as b, t1.b as a, t2.a as c
from t1 join (t2 join t4 on b + 1 = y) on t1.c = t4.c;
create algorithm=merge view v3a as
select * from t1 natural join t2 natural join t3;
create algorithm=merge view v3b as
select * from t1 natural join (t2 natural join t3);
create algorithm=merge view v4 as
select * from v2a natural join v3a;
select * from (t1 natural join t2) natural join (t3 natural join t4);
b	c	a	y
1	3	2	11
1	3	2	2
select * from (t1 natural join t2) natural left join (t3 natural join t4);
b	c	a	y
1	10	2	NULL
1	3	2	11
1	3	2	2
select * from (t3 natural join t4) natural right join (t1 natural join t2);
b	c	a	y
1	10	2	NULL
1	3	2	11
1	3	2	2
select * from (t1 natural left join t2) natural left join (t3 natural left join t4);
b	c	a	y
1	10	2	NULL
1	3	2	11
1	3	2	2
2	3	NULL	NULL
select * from (t4 natural right join t3) natural right join (t2 natural right join t1);
b	c	a	y
1	10	2	NULL
1	3	2	11
1	3	2	2
2	3	NULL	NULL
select * from t1 natural join t2 natural join t3 natural join t4;
c	b	a	y
3	1	2	11
3	1	2	2
select * from ((t1 natural join t2) natural join t3) natural join t4;
c	b	a	y
3	1	2	11
3	1	2	2
select * from t1 natural join (t2 natural join (t3 natural join t4));
c	b	a	y
3	1	2	11
3	1	2	2
select * from t5 natural right join (t4 natural right join ((t2 natural right join t1) natural right join t3));
y	c	b	a	z
11	3	1	2	4
2	3	1	2	NULL
NULL	10	1	2	NULL
select * from (t1 natural join t2), (t3 natural join t4);
b	c	a	c	b	y
1	10	2	3	1	11
1	10	2	3	1	2
1	3	2	3	1	11
1	3	2	3	1	2
select * from t5 natural join ((t1 natural join t2), (t3 natural join t4));
y	z	b	c	a	c	b
11	4	1	10	2	3	1
11	4	1	3	2	3	1
select * from  ((t1 natural join t2),  (t3 natural join t4)) natural join t5;
y	b	c	a	c	b	z
11	1	10	2	3	1	4
11	1	3	2	3	1	4
select * from t5 natural join ((t1 natural join t2) cross join (t3 natural join t4));
y	z	b	c	a	c	b
11	4	1	10	2	3	1
11	4	1	3	2	3	1
select * from  ((t1 natural join t2) cross join (t3 natural join t4)) natural join t5;
y	b	c	a	c	b	z
11	1	10	2	3	1	4
11	1	3	2	3	1	4
select * from (t1 join t2 using (b)) join (t3 join t4 using (c)) using (c);
c	b	a	b	y
3	1	2	1	11
3	1	2	1	2
select * from (t1 join t2 using (b)) natural join (t3 join t4 using (c));
b	c	a	y
1	3	2	11
1	3	2	2
select a,b,c from (t1 natural join t2) natural join (t3 natural join t4)
where b + 1 = y or b + 10 = y group by b,c,a having min(b) < max(y) order by a;
a	b	c
2	1	3
select * from (t1 natural join t2) natural left join (t3 natural join t4)
where b + 1 = y or b + 10 = y group by b,c,a,y having min(b) < max(y) order by a, y;
b	c	a	y
1	3	2	2
1	3	2	11
select * from (t3 natural join t4) natural right join (t1 natural join t2)
where b + 1 = y or b + 10 = y group by b,c,a,y having min(b) < max(y) order by a, y;
b	c	a	y
1	3	2	2
1	3	2	11
select * from t1 natural join t2 where t1.c > t2.a;
b	c	a
1	10	2
1	3	2
select * from t1 natural join t2 where t1.b > t2.b;
b	c	a
select * from t1 natural left join (t4 natural join t5) where t5.z is not NULL;
c	b	y	z
3	1	11	4