SQL查询【根据生日计算ji】

select Case when DateDiff(Year, BirthDate, GetDate()) > 0 then DateDiff(Year, BirthDate, GetDate())
                    when DateDiff(Month, BirthDate, GetDate()) > 0 then DateDiff(MONTH, BirthDate, GetDate())
                    When DATEDIFF(DAY, BirthDate, GetDate()) > 0 then DateDiff(DAY, BirthDate, GetDate()) end Age,
           Case When DateDiff(Year, BirthDate, GetDate()) > 0 then ‘岁‘
                    When DateDiff(Month, BirthDate, GetDate()) > 0 then ‘月‘
                    When DATEDIFF(DAY, BirthDate, GetDate()) > 0 then ‘日‘ end AgeUnit, BirthDate BirthDate
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原文：https://www.cnblogs.com/meitai/p/9175782.html