You can always convert a nested query into an equivalent join.
您始终可以将嵌套查询转换成等价的连接。
The structure of SQL-like nested queries is examined. It is shown that any SQL- like nested query can be decomposed into four basic nested types.
本文分析了SQL类查询语句的基本结构，指出任何一个嵌套结构的SQL类语句都可以由四种基本嵌套类型组成。
The structure of SQL-like nested queries is examined. It is shown that any SQL- like nested query can be decomposed into four basic nested types.
本文分析了SQL类查询语句的基本结构，指出任何一个嵌套结构的SQL类语句都可以由四种基本嵌套类型组成。
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