MYSQL:更新表时出错
我已经写了下面的查询来更新mysql表MYSQL:更新表时出错,mysql,sql,select,join,sql-update,Mysql,Sql,Select,Join,Sql Update,我已经写了下面的查询来更新mysql表 update table1 set val_col = 'TRUE' where id IN( SELECT ID FROM table1 a INNER JOIN table2 b ON a.a_id = b.a_id WHERE a.create_dt >= '2017-01-07' AND b.check_status = 'FAIL' AND b.check_type = 'check1' AN
update table1
set val_col = 'TRUE'
where id IN(
SELECT ID
FROM table1 a INNER JOIN
table2 b
ON a.a_id = b.a_id
WHERE a.create_dt >= '2017-01-07' AND
b.check_status = 'FAIL' AND
b.check_type = 'check1' AND
b.timestamp_val = (SELECT MAX(b2.timestamp_val)
FROM table2 b2
WHERE b2.a_id = b.a_id AND
b2.check_status = b.check_status AND
b2.check_type = b.check_type
));
我犯了一个错误
您不能在FROM子句中指定更新的目标表“table1”
错误很明显,说明您正在尝试更新table1
,但table1
也在where子句中使用。因此,创建一个内部选择并对其进行别名处理应该可以做到这一点
update table1
set val_col = 'TRUE'
where id IN(
select * from (
SELECT ID
FROM table1 a INNER JOIN
table2 b
ON a.a_id = b.a_id
WHERE a.create_dt >= '2017-01-07' AND
b.check_status = 'FAIL' AND
b.check_type = 'check1' AND
b.timestamp_val = (SELECT MAX(b2.timestamp_val)
FROM table2 b2
WHERE b2.a_id = b.a_id AND
b2.check_status = b.check_status AND
b2.check_type = b.check_type
)) aliasTable1);
只需使用
连接
:
UPDATE table1 t1 JOIN
(SELECT ID
FROM table1 a INNER JOIN
table2 b
ON a.a_id = b.a_id
WHERE a.create_dt >= '2017-01-07' AND
b.check_status = 'FAIL' AND
b.check_type = 'check1' AND
b.timestamp_val = (SELECT MAX(b2.timestamp_val)
FROM table2 b2
WHERE b2.a_id = b.a_id AND
b2.check_status = b.check_status AND
b2.check_type = b.check_type
)
) tt
ON t1.id = tt.id
set t1.val_col = 'TRUE';
我想你也可以简化逻辑