如何使用mysql获取工作日数

Question

我必须找到使用mysql的工作日数。我正在使用此查询，但这并没有给我正确的结果

 SELECT ((DATEDIFF('2015-05-31', '2015-05-01')) -((WEEK('2015-05-31') - WEEK('2015-05-01')) * 2) - 
(case when weekday('2015-05-31') = 6 then 1 else 0 end) - (case when weekday('2015-05-01') = 5 then 1 else 0 end))
as DifD ;

作为输出给出19，营业日数应为20 有人请帮忙

Answer 1

试试这个！

SET @i=-1;
SELECT SUM(CASE WHEN(WEEKDAY(ADDDATE('2015-05-01', INTERVAL @i:=@i+1 DAY))) < 5 THEN 1 ELSE 0 END) AS `business_days`
FROM `table`
WHERE @i < DATEDIFF('2015-05-31', '2015-05-01');

希望这个答案有所帮助！