小编Zwi*_*k44的帖子

现在已经坚持了一段时间了.假设我有一个Client像这里的表:

Name   BirthDayNum   BirthMonthNum   BirthYearNum
--------------------------------------------------
John       23             12             1965
Jane        4              9             1975
Joe         6              3             1953

目前我正在使用这种语法计算年龄:(对不起,如果难以阅读)

DATEDIFF(year, CONVERT(datetime, CAST(client.BirthMonthNum AS varchar(2)) 
+ '-' + CAST(client.BirthDayNum AS varchar(2)) 
+ '-' + CAST(client.BirthYearNum AS varchar(4)), 101), GETDATE()) 
- (CASE WHEN dateadd(YY, DATEDIFF(year, CONVERT(datetime, CAST(client.BirthMonthNum AS varchar(2)) 
+ '-' + CAST(client.BirthDayNum AS varchar(2)) 
+ '-' + CAST(client.BirthYearNum AS varchar(4)), 101), GETDATE()), 
CONVERT(datetime, CAST(client.BirthMonthNum AS varchar(2)) 
+ '-' + CAST(client.BirthDayNum AS varchar(2)) 
+ '-' + CAST(client.BirthYearNum AS varchar(4)), 101)) …