Question

我在MySQL中有三个名为users，user_academic_info，department_info的表，我想在这三个表上获得加入结果以获得类似搜索的选项。查询如下：

SELECT full_name, user_id, email, mobile, dept_name
FROM users, department_info
WHERE dept_id = (select dept_id from user_academic_info where ainfo_id = user_id)
AND full_name LIKE '%%'
OR user_id LIKE '%%'
OR email LIKE '%%'
OR mobile LIKE '%%'
OR dept_name LIKE '%%'

它向我展示了所有部门的所有用户，而在数据库中他们只属于一个部门。

Answer 1

请参阅mysql join

SELECT * FROM `users` AS `u`
LEFT JOIN `user_academic_info` AS `ui` ON (
   `u`.`id` = `ui`.`user_id`
)
LEFT JOIN `department_info` AS `di` ON (
   `di`.`dept_id` =`ui`.`dept_id`
)
WHERE `u`.`full_name` LIKE '%%'
OR `u`.`id` = 4

以上查询应该可以获取所有3个表中的所有字段。添加WHERE子句并在字段前添加正确的表名。

用php加入和搜索的mysql

1 个答案: