Question

如何在使用限制时使用联接进行更新

错误 - 非法使用限制运算符

UPDATE  
     table1  
INNER JOIN table2 ON table1.id = table2.id  
SET  
     table1.field = 'your_value'
WHERE  
     table1.id = table2.id  
LIMIT 1500

Answer 1

可能的解决方案，它有点像黑客

SET @tmp_c = 0;
UPDATE
    table1
INNER JOIN table2 ON table1.id = table2.id
INNER JOIN table3 ON table2.id = table3.id
SET
    table1.remove_date = NOW() - INTERVAL 5 MONTH
WHERE
    table1.active = 1
AND
    (IF (table1.active = 1, @tmp_c := @tmp_c + 1 , 0 )) //This is to only increment the counter if the whole where matches
AND
    @tmp_c <= 15 //Start ignoring row items as soon as it exceeds the limit amount

Answer 2

如果您想要限制，则应使用子选择并加入此

UPDATE  table1  
INNER JOIN ( select * from table1 
INNER JOIN table2 ON table1.id = table2.id  
LIMIT 1500 ) t on t.id = table1.id
SET  table1.field = 'your_value'

插入加入限制 - Mysql

2 个答案: