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  • 8.3 确定两个日期之间的工作日数目

    问题:给定两个日期,求它们之间(包括这两个日期本身)有多少个”工作“日。
    select sum(case
                 when date_format(
                 date_add(jones_hd,interval t500.id - 1, 'DY'),'%a')
                 in ('SAT', 'SUN') 
                 then 0 else 1
               end) as days
      from (select max(case
                         when ename = 'BLAKE' then
                          hiredate
                       end) as blake_hd,
                   max(case
                         when ename = 'JONES' then
                          hiredate
                       end) as jones_hd
              from emp
             where ename in ('BLAKE', 'JONES')) x,
           t500
     where t500.id <= datediff(blake_hd, jones_hd) + 1 ;

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  • 原文地址:https://www.cnblogs.com/liang545621/p/7523298.html
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