This is an SQL parser, function is not very wide, due to the functional limitations of itself memory database, SQL provide a lot of limit System: 1, the select does not support field values​ ​ , a query for all the fields 2, the relationship between the query only supports AND 3, UPDATE, update a field 4, does not support function

parser_yacc.y
sql_plan.h
说明.txt
parser_lex.l

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