MySQL基础查询子句 where /order by/通配符过滤 like/正则表达式过滤 regexp

##第4章 检索数据 #检索单个列、多个列、全部列 select prod_name from products; select prod_id,prod_name,prod_price from products; select * from products;git #检索不一样的行（惟一行） select vend_id from products; select distinct vend

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