Question

我有一个包含以下列的表：

date | station

Date是datetime列。

Station只是1到110之间的数字。

我需要返回上个月的1到26之间的最频繁站点值。我今天已经做到了，并且可以正常工作（下面的代码）。但是我不知道整个月该怎么做。

SELECT count(1) 
FROM   table    
WHERE  YEAR(Time_Stamp) = YEAR(GETDATE())   AND
       MONT(Time_Stamp) = MONTH(GETDATE()) AND
       DAY(Time_Stamp) = DAY(GETDATE())   AND 
       station BETWEEN 1 AND 26 
GROUP BY station
ORDER BY count(1) desc

Answer 1

只需使用WHERE子句中的数据列：

SELECT   COUNT(*), station
FROM t
WHERE station BETWEEN 1 AND 26
AND date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), -1))
AND date <  DATEADD(DAY, 1, EOMONTH(GETDATE(),  0))
GROUP BY station
ORDER BY COUNT(*) DESC

EOMONTH需要SQL Server 2012或更高版本。

获取两个日期之间的最频繁值

1 个答案: