mySql指令

查询表t1中id字段是1的内容ui select * from t1 where id=1; 结果按id字段升序（默认是升序）code select * from t1 order by id asc; 结果按id字段降序table select * from t1 order by id desc; ALTER : 删除，添加或修改表字段class alter table t1 drop id2

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