Question

关于this question，如果使用该查询来计算某些数据，我会遇到问题。如何使它可以计算ex的数据。从2010-01到2010-05？

使用后查询show为null。这是我的疑问：

SELECT id, Line, COUNT( Serial_number ) AS Qty,
       SUM(S), SUM(A), SUM(B), SUM(C),
       (SUM( S ) + SUM( A ) + SUM( B ) * 0.4 + SUM( C ) * 0.1) / COUNT( Serial_number ) AS QP
FROM `inspection_report`

Answer 1

SELECT id, Line, COUNT( Serial_number ) AS Qty,
       SUM(S), SUM(A), SUM(B), SUM(C),
       (SUM( S ) + SUM( A ) + SUM( B ) * 0.4 + SUM( C ) * 0.1) / COUNT( Serial_number ) AS QP
FROM `inspection_report`
WHERE `thedate` BETWEEN '2010-01-01' AND '2010-06-00'

MySQL：计算从A月到B月的数据

1 个答案: