如何找到两个日期之间的天数 [英] How to find the number of days between two dates

问题描述

我有一个基本查询:

SELECT dtCreated
    , bActive
    , dtLastPaymentAttempt
    , dtLastUpdated
    , dtLastVisit
FROM Customers
WHERE (bActive = 'true') 
    AND (dtLastUpdated > CONVERT(DATETIME, '2012-01-0100:00:00', 102))

我想在输出中添加另一列...让我们称其为差异"以找出dtcreated"和dtlastupdated"之间的天数 例如，如果记录 1 的 dtcreated 为 1/1/11 和 dtlastupdated 是 1/1/12，差异"列将是365".

I want to add another column to the output... lets call it "Difference" to find out the number of days between 'dtcreated' and 'dtlastupdated' So for example if record 1 has a dtcreated of 1/1/11 and dtlastupdated is 1/1/12 the "Difference" column would be "365".

这可以在查询中完成吗?

Can this be accomplished in a query?

推荐答案

您可以使用 DATEDIFF:

You would use DATEDIFF:

declare @start datetime
declare @end datetime

set @start = '2011-01-01'
set @end = '2012-01-01'

select DATEDIFF(d, @start, @end)

results = 365

对于您的查询:

SELECT dtCreated
    , bActive
    , dtLastPaymentAttempt
    , dtLastUpdated
    , dtLastVisit
    , DATEDIFF(d, dtCreated, dtLastUpdated) as Difference
FROM Customers
WHERE (bActive = 'true') 
    AND (dtLastUpdated > CONVERT(DATETIME, '2012-01-0100:00:00', 102))

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