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个人休假是10天。我需要的剩余休假从总事假扣除即10天从mysql中给定日期减去天数
SELECT id, firstname,lastname,join_date, completion_date,title, leave_from,leave_to, Given_leave_Days,Taken_Leave_Days,Remaining_Leave_Days FROM (SELECT T1.id,T1.firstname,T1.lastname,T1.join_date,T1.completion_date,T0.title,T2.leave_from,T2.leave_to,T2.user_id,T0.Leave_Days as Given_leave_Days,SUM(DATEDIFF(T2.leave_to,T2.leave_from)+1) AS Taken_Leave_Days ,T0.Leave_Days - SUM(DATEDIFF(T2.leave_to,T2.leave_from)+1) as 'Remaining_Leave_Days' FROM users_leave_request T2 INNER JOIN users T1 ON T2.user_id = T1.id INNER JOIN leave_type T0 ON T2.leave_type_id = T0.id GROUP BY T1.id, T1.firstname, T1.lastname, T1.join_date,T1.completion_date,T0.title,T2.leave_from,T2.leave_to,Given_leave_Days order by firstname) A
我不得不结果显示在前端。
如果你想修改数据库字段,你这样做都是错误的。修改是使用'UPDATE'完成的,而不是'SELECT'。尝试在网上寻找,告诉我们一些努力(至少)试图解决它,然后如果它仍然无法工作,或者你有任何问题,回到这里,你会得到帮助 –