SQL语句问题 表A有c,d等字段想获得c字段指不重复的所有记录应该怎么写 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 select c,d from a group by c select * from a where not exists(select 1 from a b where name=b.c and d>b.d) select * from a where c not in (select c from a group by c having count(c)>1) select *from a twhere (select count(1) from tb where c=t.c)=1 tb改为aselect *from a twhere (select count(1) from a where c=t.c)=1 select *from Agroup by c 求助:MySQL Server输入密码后自动关闭! MySQL登陆问题 无法访问Mysql!!!安装了WAMP5,但是无法访问。 variant_t如何输出mysql数据表中的字符串字段 web项目中对mysql服务监控问题 sqlite 高手进来啊 请问如何得到最后一次update操作的记录的id? MySQL支持存储过程调度不? mysql奇怪问题,在线等ing mssql 语句帮忙转成 mysql 数据库新增时间字段问题 IFNULL 怎么用啊
from a t
where (select count(1) from tb where c=t.c)=1
select *
from a t
where (select count(1) from a where c=t.c)=1
from A
group by c