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At first we use the ply package to implement a simple sql interpreter.
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Second, we use Lexer to do lexical analysis, the main task of lexical analysis is to identify the keywords.
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And then, we use Yacc to do grammatical analysis, the main task of grammatical analysis is to identify the expressions which represesnt the functions.
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At last, we implement the functions corresponding to the grammar, all data is stored in txt file.
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