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DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a INT, b INT, c INT, UNIQUE (A), UNIQUE(B));
INSERT t1 VALUES (1,2,10), (3,4,20);
INSERT t1 VALUES (5,6,30) ON DUPLICATE KEY UPDATE c=c+100;
SELECT * FROM t1;
a b c
1 2 10
3 4 20
5 6 30
INSERT t1 VALUES (5,7,40) ON DUPLICATE KEY UPDATE c=c+100;
SELECT * FROM t1;
a b c
1 2 10
3 4 20
5 6 130
INSERT t1 VALUES (8,4,50) ON DUPLICATE KEY UPDATE c=c+1000;
SELECT * FROM t1;
a b c
1 2 10
3 4 1020
5 6 130
INSERT t1 VALUES (1,4,60) ON DUPLICATE KEY UPDATE c=c+10000;
SELECT * FROM t1;
a b c
1 2 10010
3 4 1020
5 6 130
INSERT t1 VALUES (1,9,70) ON DUPLICATE KEY UPDATE c=c+100000, b=4;
ERROR 23000: Duplicate entry '4' for key 2
SELECT * FROM t1;
a b c
1 2 10010
3 4 1020
5 6 130
TRUNCATE TABLE t1;
INSERT t1 VALUES (1,2,10), (3,4,20);
INSERT t1 VALUES (5,6,30), (7,4,40), (8,9,60) ON DUPLICATE KEY UPDATE c=c+100;
SELECT * FROM t1;
a b c
1 2 10
3 4 120
5 6 30
8 9 60
INSERT t1 SET a=5 ON DUPLICATE KEY UPDATE b=0;
SELECT * FROM t1;
a b c
1 2 10
3 4 120
5 0 30
8 9 60
INSERT t1 VALUES (2,1,11), (7,4,40) ON DUPLICATE KEY UPDATE c=c+VALUES(a);
SELECT *, VALUES(a) FROM t1;
a b c VALUES(a)
1 2 10 NULL
3 4 127 NULL
5 0 30 NULL
8 9 60 NULL
2 1 11 NULL
explain extended SELECT *, VALUES(a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,values(`test`.`t1`.`a`) AS `VALUES(a)` from `test`.`t1`
explain extended select * from t1 where values(a);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1`
DROP TABLE t1;
create table t1(a int primary key, b int);
insert into t1 values(1,1),(2,2),(3,3),(4,4),(5,5);
select * from t1;
a b
1 1
2 2
3 3
4 4
5 5
insert into t1 values(4,14),(5,15),(6,16),(7,17),(8,18)
on duplicate key update b=b+10;
affected rows: 7
info: Records: 5 Duplicates: 2 Warnings: 0
select * from t1;
a b
1 1
2 2
3 3
4 14
5 15
6 16
7 17
8 18
replace into t1 values(5,25),(6,26),(7,27),(8,28),(9,29);
affected rows: 9
info: Records: 5 Duplicates: 4 Warnings: 0
select * from t1;
a b
1 1
2 2
3 3
4 14
5 25
6 26
7 27
8 28
9 29
drop table t1;
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