Question

我想要TotalVisitedTime时间的总和，但它是别名列，那么我怎么能得到它呢？

Select CONVERT(varchar(6), DATEDIFF(second, [Start], [End])/3600)
   + ':'
   + RIGHT('0' + CONVERT(varchar(2), (DATEDIFF(second, [Start], [End]) % 3600) / 60), 2)
   + ':'
   + RIGHT('0' + CONVERT(varchar(2), DATEDIFF(second, [Start], [End]) % 60), 2) AS TotalVisitedTime
FROM [Table Name]

注意：[开始]和[结束]是列名称。

Answer 1

SELECT SUM(TotalVisitedTime)
FROM (    
    -- AS PER @Alex Aza,  @Andriy M     
        SELECT 1234 AS TotalVisitedTime
     ) AS OuterTable

Answer 2

我认为总结秒数然后进行你想要做的转换是有意义的。

SELECT  CONVERT(varchar(6), diff/3600)
    + ':'
    + RIGHT('0' + CONVERT(varchar(2), (diff % 3600) / 60), 2)
    + ':'
    + RIGHT('0' + CONVERT(varchar(2), diff % 60), 2) AS TotalVisitedTime
FROM 
(
    select sum(DATEDIFF(second, [Start], [End]) diff
    from [Table Name]
) tt

如何从SQL中的别名列获取sum（）

2 个答案: