此代码工作正常，但执行时间很长，因为attendance_03与working_schedule_03具有相同的行数，因为working_schedule_03的转换计划如8 ：00,9：00等等，attendance_03基于其已故员工，attendance_03拥有员工的实际时间，现在我想要的是将多个列中的一些值组合在一起working_schedule_03列emp_id列和t_in（班次计划）列的t_in表，因为attendance_03未修复，员工每周更改计划，其他人已修复计划和最后一个列它具有“常规”值并取消组合“休息日”值，因此 SELECT
a.emp_id, COUNT(a.a_id) AS Cymon, b.t_in AS mt_in, c.last_name, c.first_name, e.dept_name, e.dept_id, f.l_id, f.loc
FROM
attendance_03 AS a
LEFT JOIN
(SELECT * FROM working_schedule_03 WHERE d BETWEEN 16 AND 31 AND Y = 2015 AND eve="Regular") AS b ON b.emp_id = a.emp_id AND b.d = a.dd
LEFT JOIN
employee_personal_info AS c ON c.emp_id = a.emp_id
LEFT JOIN
employee_information AS d ON d.emp_id = a.emp_id
LEFT JOIN
departments AS e ON e.dept_id = d.department
LEFT JOIN
employee_location AS f ON f.l_id = d.loc
WHERE a.yy = 2015 AND a.dd BETWEEN 16 AND 31 AND b.eve = "Regular" AND e.dept_id != 22
AND
CASE
WHEN b.t_in = "07:00" THEN HOUR(a.t_in) = "07" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "07:30" THEN HOUR(a.t_in) = "07" AND MINUTE(a.t_in) BETWEEN 31 AND 59 OR HOUR(a.t_in) = "08" AND MINUTE(a.t_in) BETWEEN 01 AND 30
WHEN b.t_in = "08:00" THEN HOUR(a.t_in) = "08" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "08:30" THEN HOUR(a.t_in) = "08" AND MINUTE(a.t_in) BETWEEN 31 AND 59 OR HOUR(a.t_in) = "09" AND MINUTE(a.t_in) BETWEEN 01 AND 30
WHEN b.t_in = "09:00" THEN HOUR(a.t_in) = "09" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "10:00" THEN HOUR(a.t_in) = "10" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "13:00" THEN HOUR(a.t_in) = "13" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "15:00" THEN HOUR(a.t_in) = "15" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "16:00" THEN HOUR(a.t_in) = "16" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "17:00" THEN HOUR(a.t_in) = "17" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "19:00" THEN HOUR(a.t_in) = "19" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "19:30" THEN HOUR(a.t_in) = "19" AND MINUTE(a.t_in) BETWEEN 31 AND 59 OR HOUR(a.t_in) = "20" AND MINUTE(a.t_in) BETWEEN 01 AND 30
WHEN b.t_in = "20:00" THEN HOUR(a.t_in) = "20" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "21:00" THEN HOUR(a.t_in) = "21" AND MINUTE(a.t_in) BETWEEN 01 AND 59
WHEN b.t_in = "23:45" THEN HOUR(a.t_in) = "23" AND MINUTE(a.t_in) BETWEEN 46 AND 59 OR HOUR(a.t_in) = "20" AND MINUTE(a.t_in) BETWEEN 01 AND 45
ELSE 0 END
GROUP BY a.emp_id
HAVING COUNT(a.emp_id) > 1
ORDER BY f.loc, e.dept_id, c.last_name ASC
将不会从具有休息日值的前夕列中获取行。谢谢！
working_schedule_03 CREATE TABLE `working_schedule_03` (
`id` mediumint(99) NOT NULL AUTO_INCREMENT,
`start_date` datetime NOT NULL,
`end_date` datetime NOT NULL,
`username` varchar(255) NOT NULL,
`m` varchar(9) NOT NULL,
`d` varchar(9) NOT NULL,
`y` varchar(9) NOT NULL,
`emp_id` varchar(99) NOT NULL,
`eve` varchar(99) NOT NULL,
`t_in` varchar(99) NOT NULL,
`t_out` varchar(99) NOT NULL,
`emp_file` varchar(99) NOT NULL,
`dt_plot` varchar(99) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=612993 DEFAULT CHARSET=latin1
表
attendance_03 CREATE TABLE `attendance_03` (
`a_id` varchar(99) NOT NULL,
`t_in` varchar(99) NOT NULL,
`t_b1_out` varchar(99) NOT NULL,
`t_b1_in` varchar(99) NOT NULL,
`t_lb_out` varchar(99) NOT NULL,
`t_lb_in` varchar(99) NOT NULL,
`t_b2_out` varchar(99) NOT NULL,
`t_b2_in` varchar(99) NOT NULL,
`t_out` varchar(99) NOT NULL,
`mu` varchar(99) NOT NULL,
`status` varchar(99) NOT NULL,
`mm` varchar(99) NOT NULL,
`dd` varchar(99) NOT NULL,
`yy` varchar(99) NOT NULL,
`d_out` int(2) NOT NULL,
`d_b1_out` int(2) NOT NULL,
`d_b1_in` int(2) NOT NULL,
`d_lb_out` int(2) NOT NULL,
`d_lb_in` int(2) NOT NULL,
`d_b2_out` int(2) NOT NULL,
`d_b2_in` int(2) NOT NULL,
`emp_id` varchar(99) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
表
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答案 0 :(得分：1)
添加INDEX会显着加快速度：
working_schedule_03将从INDEX(Y, d, eve)中受益。 attendance_03将从INDEX(emp_id, dd)中受益。 employee_personal_info和employee_information：INDEX(emp_id)。 departments：INDEX(e.dept_id) employee_location：INDEX(f.l_id) 除非您希望“正确”的表格缺少匹配的行，否则请删除LEFT。
AND b.eve = "Regular"的第二次出现是多余的（因为第一次出现）。
子查询说SELECT *。如果你只列出必要的值（emp_id, t_in, d），那么它就会少一些东西。
我嘲笑其他事情：
VARCHAR用于数字。 TIME次。 （但:00秒可能存在问题。）大CASE几乎可以变成
a.t_in＆gt; = b.t_in AND a.in＆lt; b.t_in + INTERVAL 60分钟
检查输出; COUNT(...)可能具有比所需更大的值。