如何在MySQL中仅命令一次返回重复的列值？
要在MySQL中仅返回一次列值，我们首先来看一个示例并创建一个表-
create table DemoTable680(Status varchar(100));
使用插入命令在表中插入一些记录-
insert into DemoTable680 values('Busy');
insert into DemoTable680 values('At Work');
insert into DemoTable680 values('Busy');
insert into DemoTable680 values('Blocked');
insert into DemoTable680 values('Offline');
insert into DemoTable680 values('Offline');
insert into DemoTable680 values('Blocked');使用select语句显示表中的所有记录-
select *from DemoTable680;
这将产生以下输出-
+---------+ | Status | +---------+ | Busy | | At Work | | Busy | | Blocked | | Offline | | Offline | | Blocked | +---------+ 7 rows in set (0.00 sec)
以下是在MySQL中仅返回一次重复列值的查询-
select distinct Status from DemoTable680 order by Status;
这将产生以下输出-
+---------+ | Status | +---------+ | At Work | | Blocked | | Busy | | Offline | +---------+ 4 rows in set (0.00 sec)
热门推荐
10 婆婆高寿祝福语大全简短
11 潮汕生日谚语祝福语简短
12 简短朋友旅行祝福语大全
13 永远漂亮祝福语女生简短
14 许愿星姐妹祝福语简短
15 诗词送行祝福语大全简短
16 登上舞台祝福语大全简短
17 婚礼结束聚餐祝福语简短
18 高档的伴娘祝福语简短