問題描述

有兩張表 (只是用來表示結(jié)構(gòu))

name code1 --------11 --------21 --------32----------52----------42.code num1-------22 ------ 33------ 44-------55--------6

我想 獲得name-----sum(num) 這樣的數(shù)據(jù)求大神 提點(diǎn)

問題解答

select name,sum(num) from A inner join B on A.code =B.code group by name

SELECT SUM(num) FROM 2 WHERE code IN (SELECT code FROM 1 WHERE name = 1)

select 2.num from 1 inner join 2 2 on 2.code=1.code