mysql统计总数条件判断的方法介绍

需求说明 出勤天数统计时 如果上班打卡 下班没打卡则这条打卡记录应该排除在外

count 配合 case when then 1 else null end 完成出勤天数统计

SELECT

COUNT(CASE WHEN way=0 AND sign_out_time IS NOT NULL THEN 1 ELSE NULL END) AS 'waibu',

COUNT(CASE WHEN way=1 AND sign_in_time IS NOT NULL THEN 1 ELSE NULL END) AS 'neibu'

FROM tb_sign_record WHERE user_id=5