一些SQL语句和关键字（一）

as关键字的做用 as这个关键字的做用的给字段起个别名sql select * from user select username as 帐号 , password as 密码, mingzi as 名字, zhengjianhao as 证件号, dianhua as 电话, zhuceriqi as 注册日期, zhuangtai

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