Study on the similarity comparing and knowledge push of SQL code

The lexical and syntax of SQL statement was analyzed in this paper. Firstly, the abstract syntax tree (AST) of SQL statement was established, then, the similarity between the produced AST and the object code in database was analyzed to get the Similarities and differences, finally, the differences knowledge was pushed out. The establishment process of automatic evaluation modeling of database was described in this research, which is provided a basis for further study.