計數在MySQL更新MySQL查詢，誤差支持

Question

你好需要更新的開始..

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; 

我有一個關係模型一對多。但需要包括在更新

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

假設這是計數

，其中「C」是第一選擇計數結果的個性化......而定。

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); 

說的查詢語法也不支持.. 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