mysql - count in mysql更新mysql查询，错误支持

Question

你好需要更新从...开始

 SELECT 
     tA.id, count(*) c
FROM
    tA
        join
    tA ON tB.id = tA.id
where
    tA.id = 5
GROUP BY tA.id
having c > 1;

我有一个一对多的关系模型。但需要在更新中包含计数

   UPDATE tA
        join
    tA ON tB.id = tA.id 
set 
    cnt = 5;

假设这是计数的结果

其中“c”是第一个选择计数...可能是。

UPDATE tA
        join
    tA ON tB.id = tA.id 
set 
    cnt = (SELECT 
            count(*) c
        FROM
            tA
                join
            tA ON tB.id = tA.id
        WHERE
            tA.id = 5
        GROUP BY tA.id
        having c > 1);

说查询语法也不支持..thnk

Answer 1

UPDATE  tA
        INNER JOIN
        (
            SELECT  tA.id, COUNT(*) totalCount
            FROM    tA INNER JOIN tB ON tB.id = tA.id
            WHERE   tA.id = 5
            GROUP   BY tA.id
            HAVING  COUNT(*) > 1
        ) b ON tA.id = b.id
SET     tA.cnt = b.totalCount