2020-04-29 使用DQL命令查询数据（一）

SELECT [ALL | DISTINCT] { * | table.* | [ table.field1 [ as alias1] [,table.field2 [as alias2]][,…]] } FROM table_name [ as table_ alias ] [left|out|inner join table_name2] #联合查询 [ WHERE … ] #指定结果需满足的

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