CRUD操做数据库

基本查询语句 SELECT *|字段名 FROM TABLENAME,TABLENAME1... [WHERE 表达式  [GROUP BY 条件] [HAVING 表达式,表达式1,...] [ORDER BY 条件] [LIMIT [<offset>,] <row count>]SELECT [字段1，字段2,...,字段n] FROM [表或试图] WHERE [查询条件]; GROUP B

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