SQL语句面试题目：多表查询、SQL约束、DDL、DML

1 SQL语句多表查询 例如：按照 department_id 查询 employees(员工表)和 departments(部门表)的信息。 sql 方式一(通用型):SELECT ... FROM ... WHERE 数据库 SELECT e.last_name,e.department_id,d.department_name FROM employees e,departments d

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