查詢MySql數據庫架構信息：數據庫，表，表字段

/*1.查詢全部數據庫*/ show databases;  /*2.查詢全部數據表*/ select * from information_schema.tables where table_schema='world' /*3.查詢指定表的全部字段*/ select * from information_schema.columns  where table_schema='world' an

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