? ? ? ? ? ? ? ? ? ? ? ? ? ?計(jì)算兩個(gè)時(shí)間列的差值

需求描述

需求：對(duì)EMP表里員工KING和SMITH的hiredate入職時(shí)間差，這里單位是分鐘、小時(shí)、天、周、月、年.

解決方法:通過DATEDIFF函數(shù)來完成.

注: 數(shù)據(jù)庫數(shù)據(jù)集SQL腳本詳見如下鏈接地址

員工表結(jié)構(gòu)和數(shù)據(jù)初始化SQL腳本

SQL代碼

-- Mysql： SELECT B.ename b_Ename,B.HIREDATE b_hiredate,A.ename a_Ename, A.HIREDATE a_hiredate, TIMESTAMPDIFF(MINUTE,A.HIREDATE,B.HIREDATE) minute_diff, TIMESTAMPDIFF(HOUR,A.HIREDATE,B.HIREDATE) hour_diff, DATEDIFF(B.HIREDATE,A.HIREDATE) day_diff, TIMESTAMPDIFF(WEEK,A.HIREDATE,B.HIREDATE) week_diff,TIMESTAMPDIFF(MONTH,A.HIREDATE,B.HIREDATE) month_diff, TIMESTAMPDIFF(YEAR,A.HIREDATE,B.HIREDATE) year_diff FROM emp A,emp B WHERE A.ename = 'SMITH' AND B.ename = 'KING'

執(zhí)行結(jié)果

-- SQL Server： SELECT B.ename b_Ename,B.HIREDATE b_hiredate,A.ename a_Ename, A.HIREDATE a_hiredate ,DATEDIFF(MINUTE,A.HIREDATE,B.HIREDATE) minute_Diff ,DATEDIFF(HOUR,A.HIREDATE,B.HIREDATE) hour_Diff ,DATEDIFF(DAY,A.HIREDATE,B.HIREDATE) day_Diff ,DATEDIFF(WEEK,A.HIREDATE,B.HIREDATE) week_Diff ,DATEDIFF(MONTH,A.HIREDATE,B.HIREDATE) month_Diff ,DATEDIFF(YEAR,A.HIREDATE,B.HIREDATE) year_Diff FROM emp A,emp B WHERE A.ename = 'SMITH' AND B.ename = 'KING'

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