首先建立一个表如下:
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BirthDay datetime not null
Age 通过公式计算得出
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以上是表的两个字段,通过BirthDay字段的数据自动生成Age字段
Age字段的公式如下:
(case when (datediff(year,[BirthDay],getdate()) <> 0) then (ltrim(datediff(year,[BirthDay],getdate())) + '岁') else (case when (datediff(month,[BirthDay],getdate()) <> 0) then (ltrim(datediff(month,[BirthDay],getdate())) + '月') else (case when (datediff(day,[BirthDay],getdate()) <> 0) then (ltrim(datediff(day,[BirthDay],getdate())) + '天') else '' end) end) end)
这样子产生的数据就是通过填写的日期计算的。
下面是一个简单的SQL语句:
1 SELECT * , 2 ( CASE WHEN ( DATEDIFF ( year , [ BirthDay ] , GETDATE ()) <> 0 ) 3 THEN ( LTRIM ( DATEDIFF ( year , [ BirthDay ] , GETDATE ())) + ' 岁 ' ) 4 ELSE ( CASE WHEN ( DATEDIFF ( month , [ BirthDay ] , GETDATE ()) <> 0 ) 5 THEN ( LTRIM ( DATEDIFF ( month , [ BirthDay ] , GETDATE ())) 6 + ' 月 ' ) 7 ELSE ( CASE WHEN ( DATEDIFF ( day , [ BirthDay ] , 8 GETDATE ()) <> 0 ) 9 THEN ( LTRIM ( DATEDIFF ( day , [ BirthDay ] , 10 GETDATE ())) + ' 天 ' ) 11 ELSE '' 12 END ) 13 END ) 14 END ) 15 FROM Test
以上是进行测试的代码