首先建立一個表如下:
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BirthDay datetime not null
Age 通過公式計算得出
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以上是表的兩個字段,通過BirthDay字段的數據自動生成Age字段
Age字段的公式如下:
(case when (datediff(year,[BirthDay],getdate()) <> 0) then (ltrim(datediff(year,[BirthDay],getdate())) + '歲') 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)
這樣子產生的數據就是通過填寫的日期計算的。
下面是一個簡單的SQL語句:
1 SELECT * , 2 ( CASE WHEN ( DATEDIFF(year, [BirthDay], GETDATE()) <> 0 ) 3 THEN ( LTRIM(DATEDIFF(year, [BirthDay], GETDATE())) + '歲' ) 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
以上是進行測試的代碼