Question

有没有办法在不同的日期组合中使用查询，而无需单独更改每个组合的日期？

例如，而不是：

SELECT COUNT(X) FROM [TABLE] 
WHERE date1 = '21-01-2017' and date2 = '22-01-2017'

SELECT COUNT(X) FROM [TABLE] 
WHERE date1 = '22-01-2017' and date2 = '23-01-2017'

SELECT COUNT(X) FROM [TABLE] 
WHERE date1 = '23-01-2017' and date2 = '24-01-2017'

输出：

23
7
25

所以，我想在一个查询中知道组合的输出：

date1 = '21-01-2017' and date2 = '22-01-2017'

date1 = '22-01-2017' and date2 = '23-01-2017'

date1 = '23-01-2017' and date2 = '24-01-2017'

在最理想的情况下，我不想手动更改每个日期，但有类似的内容：

的每个组合

((Date1 between '21-01-2017' and '23-01-2017') x
(Date2 between '22-01-2017' and '24-01-2017'))

Answer 1

您可以对每个日期范围使用Case-When：

 SELECT 
    COUNT ( CASE WHEN DATE1 BETWEEN '21-01-2017' AND '22-01-2017' then 1 ELSE NULL END) AS COL_21_01,
    COUNT ( CASE WHEN DATE1 BETWEEN '22-01-2017' AND '23-01-2017' then 1 ELSE NULL END) AS COL_22_01

FROM [Table]

你会得到这样的：

COL_22_01 | COL_22_01

6 | 56

多个日期的输出（独立）

1 个答案: