Sql server sqlserver中与日期时间相关的查询

执行上述查询时，结果集的格式如下

DECLARE @PreviousMonthStart DATETIME
DECLARE @PreviousMonthEnd DATETIME

SET @PreviousMonthStart = DATEADD(m,DATEDIFF(m,0,GETDATE())-1,0)
SET @PreviousMonthEnd = DATEADD(ms,-2,DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))

PRINT @PreviousMonthStart
PRINT @PreviousMonthEnd

Mar  1 2017 12:00AM
Mar 31 2017 11:59PM

但我需要以下格式的结果集

DECLARE @PreviousMonthStart DATETIME
DECLARE @PreviousMonthEnd DATETIME

SET @PreviousMonthStart = DATEADD(m,DATEDIFF(m,0,GETDATE())-1,0)
SET @PreviousMonthEnd = DATEADD(ms,-2,DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))

PRINT @PreviousMonthStart
PRINT @PreviousMonthEnd

Mar  1 2017 12:00AM
Mar 31 2017 11:59PM

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任何帮助

t-sql的结果都是您想要的，但是因为您使用的是

PRINT

查看结果，所以它在打印之前将结果强制转换为varchar

如果您只是选择而不是打印，它将显示您想要查看的内容

2017-04-01 00:00:00.000

---

您可以在print语句中添加带有声明变量的

CONVERT

DECLARE @PreviousMonthStart DATETIME
DECLARE @PreviousMonthEnd DATETIME

SET @PreviousMonthStart = DATEADD(m,DATEDIFF(m,0,GETDATE())-1,0)
SET @PreviousMonthEnd = DATEADD(ms,-2,DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))


SELECT @PreviousMonthStart      -- Result: 2017-03-01 00:00:00.000
SELECT @PreviousMonthEnd        -- Result: 2017-03-31 23:59:59.997

PRINT @PreviousMonthStart       -- Result: Mar  1 2017 12:00AM  
PRINT @PreviousMonthEnd         -- Result: Mar 31 2017 11:59PM

输出：

DECLARE @PreviousMonthStart DATETIME
DECLARE @PreviousMonthEnd DATETIME

SET @PreviousMonthStart = DATEADD(m,DATEDIFF(m,0,GETDATE())-1,0)
SET @PreviousMonthEnd = DATEADD(ms,-2,DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))

PRINT CONVERT(VARCHAR(25),@PreviousMonthStart,120)
PRINT CONVERT(VARCHAR(25),@PreviousMonthEnd,120)

它们在

datetime

s时没有格式。出于显而易见的原因，只有那些

print

s必须将它们转换为字符串。只要将它们保留为

datetime

s，它们就没有格式，也就没有格式问题。