3
目前我在做一個查詢,有3子查詢,
所有查詢都在同一個表,
所有查詢有不同的where子句在同一張桌子上查詢4個更好的方法?
我曾經想過做一組然而,這會破壞SUM ()
這裏是查詢
SELECT SUM(club) AS club,
(SELECT COUNT(id) FROM action_6_members WHERE SUBSTR(CODE, 1, 1) = '9') AS 5pts,
(SELECT COUNT(id) FROM action_6_members WHERE SUBSTR(CODE, 1, 1) = 'A') AS 10pts,
(SELECT COUNT(id) FROM action_6_members WHERE SUBSTR(CODE, 1, 1) NOT IN('9', 'A')) AS General
FROM action_6_members;
這裏是解釋
id select_type table type rows Extra 1 PRIMARY action_6_members ALL 1471 4 SUBQUERY action_6_members ALL 1471 Using where 3 SUBQUERY action_6_members ALL 1471 Using where 2 SUBQUERY action_6_members ALL 1471 Using where
我想這樣做類似的東西, 的但後來我結了數百行,所有與俱樂部的部分價值, ,我需要任何不以9開頭的代碼或分組爲一組 – Hailwood 2010-08-12 01:23:30
我可以這樣做: 'SELECT SUM(club)AS club,COUNT(1)FROM action_6_members GROUP BY IF(SUBSTR(CODE,1, 1)= 9,1,IF(SUBSTR(CODE,1,1)='A',2,3));'但是我仍然以部分值爲結束總和 – Hailwood 2010-08-12 01:28:18