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Mysql知识点--DQL-基本查询

悄然丝语 2022-01-07 阅读 41

1.别名查询,使用关键词as
select * from student as p;

列起别名:select name as ‘商品名’ ,price ‘价格’ from product;
去掉重复值:select distinct price from product;(去除price这一列重复的值)
select distinct * from student;(去除重复的行)

特殊使用:
select 6-2;
select 6/2;

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