SQL Server中的IF或THEN
我在谷歌上搜索了一下,取得了一些进展,但我似乎无法正确理解语法。我认为应该是这样的:SQL Server中的IF或THEN,sql,sql-server,Sql,Sql Server,我在谷歌上搜索了一下,取得了一些进展,但我似乎无法正确理解语法。我认为应该是这样的: SELECT IF(Substring(dbo.LIMIT_HIST.ID,8,5) = '.0010' OR Substring(dbo.LIMIT_HIST.ID,8,5) = '.0020' Left(dbo_LIMIT_HIST.ID,18),"")) AS IDs FROM dbo.LIMIT_HIST INNER JOIN dbo.CUSTOMER ON
SELECT
IF(Substring(dbo.LIMIT_HIST.ID,8,5) = '.0010' OR
Substring(dbo.LIMIT_HIST.ID,8,5) = '.0020'
Left(dbo_LIMIT_HIST.ID,18),"")) AS IDs
FROM
dbo.LIMIT_HIST INNER JOIN
dbo.CUSTOMER ON
dbo.LIMIT_HIST.LIABILITY_NUMBER = dbo.CUSTOMER.CUSTOMER_CODE
有人能把我推到正确的方向吗?
谢谢 看起来您需要一个案例陈述
SELECT
CASE
WHEN Substring(dbo.LIMIT_HIST.ID,8,5) = '.0010'
OR Substring(dbo.LIMIT_HIST.ID,8,5) = '.0020'
THEN Left(dbo_LIMIT_HIST.ID,18)
ELSE ''
END AS IDs
FROM
dbo.LIMIT_HIST INNER JOIN
dbo.CUSTOMER ON
dbo.LIMIT_HIST.LIABILITY_NUMBER = dbo.CUSTOMER.CUSTOMER_CODE
sql中做什么的语法?嘿,为什么在“.0020”之后没有AND或or和Left?在谷歌搜索时,我看到了一个Case…When的例子,但我看到了更多If…Then的例子。非常混乱。但现在它有了意义。If-then通常在select之外用于控制代码的逻辑流。是在SQL 2012中引入的,在本例中可以替换CASE语句,因为您只有一个WHEN。但是,我很高兴你们都清理干净了!