如何摺疊這個嵌套的MySQL查詢？

Question

SELECT num, COUNT(num) AS amt 
FROM table 
WHERE num IN (
    SELECT num 
    FROM table 
    WHERE id IN (1,2,3)) 
GROUP BY num 
HAVING amt > 1 

另外，我怎樣才能得到

'777'=> '2'

..代替

'NUM'=> '777'
'amt'=>'2'

結果？

感謝

Answer 1

您不能在聚合列做了where，你必須使用having那些。

SELECT t1.num, 
     COUNT(t1.num) AS amt 
FROM `table` t1 
INNER JOIN `table` t2 ON (t1.num = t2.num) 
WHERE t2.id IN (1,2,3) 
GROUP BY t1.num 
HAVING amt > 1