Question

我有一个表，我试图将Col A的总和加到所有行的2个小数位（有一个id列ID），满足以下条件：

1）还有另一行具有匹配的Col B

2）它在Col C和Col D

中有一对唯一的值

Answer 1

试试这个：

SELECT ROUND(SUM(ColA), 2) AS ColA_Sum

FROM datatable t

WHERE EXISTS (
    SELECT 1
    FROM datatable t2
    WHERE t2.ID <> t.ID -- Another row must have different id
    AND t2.ColB = t.ColB -- Matching Column B

)

AND EXISTS (
    SELECT 1
    FROM datatable t3
    WHERE t3.ColC = t.ColC -- Same Column C
    AND t3.ColD = t.ColD -- Same Column D
    HAVING COUNT(*) = 1 -- Only 1 row with such values
)

Answer 2

我认为它可能很简单：

SELECT ROUND(SUM(t.cola), 2) AS cola_sum
FROM t
WHERE cola = colb
AND NOT EXISTS
(SELECT 1
 FROM t t2
 WHERE t2.colc = t.colc
 AND t2.cold = t.cold
 GROUP BY colc, cold
 HAVING COUNT(*) > 1)

在此查看测试：http://rextester.com/BSVW57900

获取满足多个条件的SQL查询行的总和

2 个答案: