MySQL-联合查询
引入
SELECT *
FROM `employees`
WHERE `department_id`>90
OR `email` LIKE '%a%'
利用union来做
SELECT * FROM `employees` WHERE `department_id`>90
UNION
SELECT * FROM `employees` WHERE `email` LIKE '%a%'
union语法:
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SELECT *
FROM `employees`
WHERE `department_id`>90
OR `email` LIKE '%a%'
利用union来做
SELECT * FROM `employees` WHERE `department_id`>90
UNION
SELECT * FROM `employees` WHERE `email` LIKE '%a%'
union语法: