Question

我有这样的查询：

SELECT DATEDIFF(minute,t.Paydate,t.DelDate) as Mtime 
       FROM Transaction_tbl t WHERE Locid=6

这将返回如下结果：

Mtime
8
2
10
20
15
7
6

但是，在那个查询中，我必须给出条件，就像我想要显示结果一样只有不到10分钟或不到15分钟。我还有一个位置的表格。在那里，我有一个 timeinterval 列，数据类型时间（0）。实际上这个值我想在同一个查询中传递。那么如何重写我的查询显示结果不到10分钟呢？

Answer 1

在AND子句中添加WHERE条件：

SELECT  
    DATEDIFF(MINUTE, t.Paydate, t.DelDate) AS Mtime 
FROM Transaction_tbl t 
WHERE 
    Locid = 6
    AND DATEDIFF(MINUTE,t.Paydate,t.DelDate) < 10

根据您的新疑点：

SELECT  
    DATEDIFF(MINUTE, t.Paydate, t.DelDate) AS Mtime,
    COUNT(*) AS Count 
FROM Transaction_tbl t 
WHERE 
    Locid = 6
GROUP BY Mtime
HAVING DATEDIFF(MINUTE, t.Paydate, t.DelDate) < 10

你可以做这样的事情

SELECT  
   case when ( DATEDIFF(MINUTE, t.Paydate, t.DelDate)<10) then DATEDIFF(MINUTE, t.Paydate, t.DelDate) else null end AS lessthan10,
case when ( DATEDIFF(MINUTE, t.Paydate, t.DelDate)>10) then DATEDIFF(MINUTE, t.Paydate, t.DelDate) else null end AS greaterthan10,
    COUNT(*) AS Count 
FROM Transaction_tbl t 
WHERE 
    Locid = 6
GROUP BY Mtime
HAVING DATEDIFF(MINUTE, t.Paydate, t.DelDate) < 10

Answer 2

试试这个。

WITH CTE(Mtime) As (
select DATEDIFF(minute,t.Paydate,t.DelDate) as Mtime 
from Transaction_tbl  t
)
Select Mtime from 
CTE
Where Mtime < 10

参考：Using Common Table Expressions

选择日期时间差（以分钟为单位）小于特定分钟数

2 个答案: