@@sqlserver CASE WHEN
1.case when 的用法
(1)简单Case函数
CASE sex
WHEN '1' THEN '男'
WHEN '2' THEN '女'
ELSE '其他'
END
(2)--Case搜索函数
CASE WHEN sex = '1' THEN '男'
WHEN sex = '2' THEN '女'
ELSE '其他'
END
2.case when 代码
1.case when 用在取字段名上 select id,username (case when f.answerer is not null then 1 else 0 end) as isAnswer f from user 2.根据区间进行选择值 select case when type in (1,2) then 1 when type in (3,4) then 2 when type in (5,6,7,8) then 3 when type in (9,10,11,12,13,14,15) then 4 when type in (16,17,18) then 5 when type in (19,20,21,22,23,24,25) then 6 when type in (26,27,28,29) then 7 when type in (30,31) then 8 when type in (32) then 9 else 9 end type,userID from plat_teacher_BonusPoints_record with(nolock) where cwareID=#cwareID# and status=1
3.isEqual 的用法(用在where查询条件下)
<isEqual prepend="and" property="selectTime" compareValue="1"> datediff(week,createTime,getdate())=0 </isEqual> <isEqual prepend="and" property="selectTime" compareValue="2"> datediff(month,createTime,GETDATE())=0 </isEqual>
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原文链接:https://blog.csdn.net/Michaeles/article/details/85279851