一道面试题 表A中有字段B 其中有重复值(内容) 请计算出重复值(内容)是什么? 有几个? 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 B,count(*)from Agroup by Bhaving count(*)>1 select B,count(*)from Agroup by Bhaving count(*)>1 select B, count(*) [个数]from Agroup by B select B,count(*) from A group by b having count(b)>1 select B,count(*)from Agroup by Bhaving count(*)>1 select count(1),b fromfrom awhere exists(select * from a z where z.b = a.b)group by b这样也可以.嘿嘿,面试的时候多写几种方法应该更好吧? 来晚了只有顶!select B,count(*)from Agroup by Bhaving count(*)>1 删除数据 数据库备份 记录一对多时,在多记录的表中取一条记录 nvarchar 类型 乱码 sql的分组排序问题 自动编号问题~~~急~~在线等 有请高手!!!!!!! 请问go命令是干什么的。 如何把ACCESS数据库导入SQL SERVER 数据追加的问题 in有其他的操作可以替代吗?效率太低了. 分组问题,要按条件进行分组
from A
group by B
having count(*)>1
from A
group by B
having count(*)>1
count(*) [个数]
from A
group by B
from A
group by b
having count(b)>1
from A
group by B
having count(*)>1
from a
where exists(select * from a z where z.b = a.b)
group by b这样也可以.
嘿嘿,面试的时候多写几种方法应该更好吧?
select B,count(*)
from A
group by B
having count(*)>1