如果没有行匹配，则返回一个值 [英] Return a value if no rows match

问题描述

[authorityID] (TinyInt)列将永远不会是null.

如果没有行，我要返回一个15.在下面的查询中，如果没有行，我什么也没得到:

What I want is to return a 15 if there are no rows. With the query below I get nothing if there are no rows:

select top 1 isnull([authorityID],15) 
from [docAuthority] with (nolock) 
where [grpID] = 0 and [sID] = 42

推荐答案

SELECT  authorityId = isnull(( SELECT   [authorityID]
                               FROM     [docAuthority] WITH ( NOLOCK )
                               WHERE    [grpID] = 0
                                        AND [sID] = 42
                             ), 15)

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