连接的子查询（在/存在）

Posted 2023-02-16

【中文标题】连接的子查询（在/存在）

【英文标题】：Subqueries (in / exists) to Joins

【发布时间】：2015-04-02 05:25:33

【问题描述】：

SELECT *, `o_cheque_request.member_id`, `o_cheque_request.wallet_id`
FROM `o_cheque_request`, `o_member`, o_memberinfo`
WHERE `o_cheque_request.member_id` = `o_member.member_id`
AND `o_member.member_id` = `o_memberinfo.member_id`
AND withdraw_date >='2012-07-21'
AND `o_cheque_request.member_id`
IN (SELECT `member_id` FROM `o_cheque_request` GROUP BY `member_id` HAVING SUM(gross_amount ) <=10000)
GROUP BY `o_cheque_request.withdraw_date`, `o_cheque_request.member_id` ORDER BY `request_id` DESC

这需要 29 秒左右的时间如何减少...使用连接...请大家帮帮我...o_cheque_requestrequest_idbigint(20) 的表结构unsigned NOT NULL auto_increment,wallet_id int(11) NOT NULL 默认 '0',member_id int(10) unsigned NOT NULL 默认 '0',withdraw_date date 默认 NULL, amount int(10) unsigned NOT NULL default '0',gross_amount float(10,2) unsigned NOT NULL default '0.00',admin_charge float(10,2)无符号非空默认'0.00'，tds浮点（10,2）无符号非空默认'0.00'，repurchase浮点（10,2）无符号非空默认'0.00'，net_amount float(10,2) unsigned NOT NULL 默认为 '0.00',withdraw_type varchar(50) 默认为 NULL,bank_name varchar(50) 默认为 NULL,cheque_no varchar(50) 默认 NULL,courier_name varchar(50) 默认 NULL,tracking_no varchar(50) 默认 NULL,cheque_date 日期默认 '0000-00-00', 主键 (request_id), 键member_id (member_id) ) ENGINE=InnoDB 默认字符集=latin1 AUTO_INCREMENT=4738 ;

【问题讨论】：

29 秒获取多少条记录？并请提供您的表结构。

嘿，我在 o_cheque_request 表中有 4000 多个条目...

请以正确的方式提供表结构，并为您在查询中使用的三个表及其内部关系提供。

每个表都有共同的字段名称 member_id 来连接它们

【参考方案1】：

试试这个

 SELECT * FROM (
        SELECT *, `o_cheque_request.member_id`, `o_cheque_request.wallet_id`
        FROM `o_cheque_request`
        JOIN `o_member` ON `o_cheque_request.member_id` = `o_member.member_id`
        JOIN `o_memberinfo` ON `o_member.member_id` = `o_memberinfo.member_id`
        WHERE withdraw_date >='2012-07-21'
        GROUP BY `o_cheque_request.member_id` HAVING SUM(`o_cheque_request.gross_amount` ) <=10000
    ) AS T
    GROUP BY `withdraw_date`, `member_id` ORDER BY `request_id` DESC

【讨论】：

感谢回复，但得到 error :: 您的 SQL 语法有错误；检查与您的 mysql 服务器版本相对应的手册，以在第 1 行的 '( SELECT *, o_cheque_request.member_id, `o_cheque_request.wal' 附近使用正确的语法