SQL語句面試題目：多表查詢、SQL約束、DDL、DML

1 SQL語句多表查詢 例如：按照 department_id 查詢 employees(員工表)和 departments(部門表)的信息。 sql 方式一(通用型):SELECT ... FROM ... WHERE 數據庫 SELECT e.last_name,e.department_id,d.department_name FROM employees e,departments d

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