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使用T-SQL实现多表查询-计刚-51CTO博客

 6 years ago
source link: http://blog.51cto.com/13588598/2067797
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表连接的类型:1.内连接(innerjoin):是最常用的一种连接方式,只返回两个数据集合之间匹配关系的行,将位于两个互相交叉的数据集合中重叠部分以内的数据行连接起来。 例子:在表A和表B中使用内连接查询学生姓名,学校和职业。实现方式一: selectA.姓名,A.学校,B.职业fromA,BwhereA.姓名=B.姓名 含义:结果显示表A的姓名和学校,表B的职业,从

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