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mysql多表查询之_内连接_显示内连接
2022-07-23 12:10:00 【Camellia——】
-- 显示内连接的语法:
-- select 字段名称1,字段名称2...from 表名1 inner(可以省略)join 表名2 on 连接条件
-- 需求:员工表中所有信息同时关联查询部门的部门名称
SELECT
emp.*,
dept.`name`
FROM
emp
INNER JOIN dept
ON emp.`dept_id` = dept.`id` ;
-- 改进:加上别名
SELECT
t1.*,
t2.`name`
FROM
emp t1
JOIN dept t2
ON t1.`dept_id` = t2.`id` ;
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