7-2 结合多个表
内部结合：根据关系情报进行结合演算
文法：
SELECT 选择的列 FROM 表名1 INNER JOIN 表名2
on 表名1.结合键所在列= 表名2.结合键所在列
实例
将社员表和部门表进行内部结合.结合键为 部门编号
SELECT*FROM 社
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