In order to solve the difficulty of nested structure of SQL, the idea of query block is introduced and the algorithm of changing query block to SQL is realized.
为了解决嵌套结构转换的难点，引进了查询块的概念，实现了查询块向SQL语句转换的算法，并将此转换方法与以前的方法进行了比较。
In order to solve the difficulty of nested structure of SQL, the idea of query block is introduced and the algorithm of changing query block to SQL is realized.
为了解决嵌套结构转换的难点，引进了查询块的概念，实现了查询块向SQL语句转换的算法，并将此转换方法与以前的方法进行了比较。
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