MySQL数据库SQL之查询语句进阶

查询指定字段 select name,age from students; 使用 as 给字段起别名 select id as 序号, name as 名字, gender as 性别 from students; 消除重复行 select distinct gender from students; 条件查询 select * from students where id=1; 模糊查询 lik

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