Question

我如何能够最大限度地减少和优化这个mysql查询，从错误中获取更快更安全，请有人帮助我，这样我就可以更快更有效地配置我的SQL查询，并最大限度地减少执行mysql查询的加载时间。加载时间的主要来源是attendance_03和working_schedule_03之间的连接连接，它们将两个表之间的每个ID和日期合作。请帮助我，我真的需要你的帮助。这是我的表格列

SELECT * FROM 
(SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "07:00"
  AND 
    (
      HOUR(attendance_03.t_in) = "07" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    )
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "07:30"
  AND (
    (
      HOUR(attendance_03.t_in) = "07" 
      AND MINUTE(attendance_03.t_in) BETWEEN 31 
      AND 59
    ) 
    OR (
      HOUR(attendance_03.t_in) = "08" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 30
    )
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "08:00"
  AND 
    (
      HOUR(attendance_03.t_in) = "08" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    )
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "08:30"
  AND (
    (
      HOUR(attendance_03.t_in) = "08" 
      AND MINUTE(attendance_03.t_in) BETWEEN 31 
      AND 59
    ) 
    OR (
      HOUR(attendance_03.t_in) = "09" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    )
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "09:00" 
  AND (
    HOUR(attendance_03.t_in) = "09" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "10:00"
  AND (
    HOUR(attendance_03.t_in) = "10" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "13:00"
  AND (
    HOUR(attendance_03.t_in) = "13" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "15:00"
  AND (
    HOUR(attendance_03.t_in) = "15" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "16:00"
  AND (
    HOUR(attendance_03.t_in) = "16" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "17:00"
  AND (
    HOUR(attendance_03.t_in) = "17" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "19:00"
  AND (
    HOUR(attendance_03.t_in) = "19" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "19:30"
  AND (
    (
      HOUR(attendance_03.t_in) = "19" 
      AND MINUTE(attendance_03.t_in) BETWEEN 31 
      AND 59
    ) 
    OR (
      HOUR(attendance_03.t_in) = "20" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 30
    )
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "20:00"
  AND (
    HOUR(attendance_03.t_in) = "20" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "21:00"
  AND (
    HOUR(attendance_03.t_in) = "21" 
    AND MINUTE(attendance_03.t_in) BETWEEN 01 
    AND 59
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1 
UNION
SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN `working_schedule_03`  
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` AND CONCAT(`working_schedule_03`.`m`,`working_schedule_03`.`d`,`working_schedule_03`.`y`) = CONCAT(`attendance_03`.`mm`,`attendance_03`.`dd`,`attendance_03`.`yy`)  
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE `working_schedule_03`.`t_in` = "23:45"
  AND (
    (
      HOUR(attendance_03.t_in) = "23" 
      AND MINUTE(attendance_03.t_in) BETWEEN 46 
      AND 59
    ) 
    OR (
      HOUR(attendance_03.t_in) = "24" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 45
    )
  ) 
  AND attendance_03.yy = 2015 
  AND (attendance_03.dd BETWEEN 01 
    AND 15) 
GROUP BY `attendance_03`.`emp_id` 
HAVING COUNT(attendance_03.emp_id) > 1) AS g 
ORDER BY g.loc,
g.dept_id,
g.last_name ASC

这是我的表出勤率_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

这是我的working_schedule_03表

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=572136 DEFAULT CHARSET=latin1

Answer 1

不将DATE拆分为yy，mm，dd。不使用VARCHAR作为数值。同上时间组件。

将所有相同的JOIN拉出UNION。

索引您正在加入的字段。

请勿使用LEFT，除非＆＃39;正确＆＃39;表可能缺少行。

解决这些问题，然后再回来进行另一次颠簸。

Answer 2

这是我做的优化sql查询。

SELECT 
  `last_name`,
  `first_name`,
  `attendance_03`.`emp_id`,
  `departments`.`dept_name`,
  `departments`.`dept_id`,
  `employee_location`.`loc`,
  `working_schedule_03`.`t_in` AS mt_in,
  COUNT(attendance_03.a_id) AS Cymon 
FROM
  (`attendance_03`) 
  LEFT JOIN 
    (SELECT 
      * 
    FROM
      `working_schedule_03` 
    WHERE `eve` = "Regular" 
      AND `y` = 2015 
    GROUP BY `emp_id`) AS `working_schedule_03` 
    ON `working_schedule_03`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_personal_info` 
    ON `employee_personal_info`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `employee_information` 
    ON `employee_information`.`emp_id` = `attendance_03`.`emp_id` 
  LEFT JOIN `departments` 
    ON `departments`.`dept_id` = `employee_information`.`department` 
  LEFT JOIN `employee_location` 
    ON `employee_location`.`l_id` = `employee_information`.`loc` 
WHERE 
  (SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "07:00" 
    AND (
      HOUR(attendance_03.t_in) = "07" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "07:30" 
    AND (
      (
        HOUR(attendance_03.t_in) = "07" 
        AND MINUTE(attendance_03.t_in) BETWEEN 31 
        AND 59
      ) 
      OR (
        HOUR(attendance_03.t_in) = "08" 
        AND MINUTE(attendance_03.t_in) BETWEEN 01 
        AND 30
      )
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "08:00" 
    AND (
      HOUR(attendance_03.t_in) = "08" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "08:30" 
    AND (
      (
        HOUR(attendance_03.t_in) = "08" 
        AND MINUTE(attendance_03.t_in) BETWEEN 31 
        AND 59
      ) 
      OR (
        HOUR(attendance_03.t_in) = "09" 
        AND MINUTE(attendance_03.t_in) BETWEEN 01 
        AND 59
      )
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "09:00" 
    AND (
      HOUR(attendance_03.t_in) = "09" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "10:00" 
    AND (
      HOUR(attendance_03.t_in) = "10" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "13:00" 
    AND (
      HOUR(attendance_03.t_in) = "13" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "15:00" 
    AND (
      HOUR(attendance_03.t_in) = "15" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "16:00" 
    AND (
      HOUR(attendance_03.t_in) = "16" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "17:00" 
    AND (
      HOUR(attendance_03.t_in) = "17" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "19:00" 
    AND (
      HOUR(attendance_03.t_in) = "19" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "19:30" 
    AND (
      (
        HOUR(attendance_03.t_in) = "19" 
        AND MINUTE(attendance_03.t_in) BETWEEN 31 
        AND 59
      ) 
      OR (
        HOUR(attendance_03.t_in) = "20" 
        AND MINUTE(attendance_03.t_in) BETWEEN 01 
        AND 30
      )
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "20:00" 
    AND (
      HOUR(attendance_03.t_in) = "20" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "21:00" 
    AND (
      HOUR(attendance_03.t_in) = "21" 
      AND MINUTE(attendance_03.t_in) BETWEEN 01 
      AND 59
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1 
  UNION
  SELECT 
    * 
  FROM
    (`attendance_03`) 
  WHERE `working_schedule_03`.`t_in` = "23:45" 
    AND (
      (
        HOUR(attendance_03.t_in) = "23" 
        AND MINUTE(attendance_03.t_in) BETWEEN 46 
        AND 59
      ) 
      OR (
        HOUR(attendance_03.t_in) = "24" 
        AND MINUTE(attendance_03.t_in) BETWEEN 01 
        AND 45
      )
    ) 
    AND attendance_03.yy = 2015 
    AND (attendance_03.dd BETWEEN 01 
      AND 15) 
    AND `employee_location`.`l_id` = 2 
  GROUP BY `attendance_03`.`emp_id` 
  HAVING COUNT(attendance_03.emp_id) > 1)

如何减少我的SQL查询的加载时间并最小化我的代码

2 个答案: