sql查询查找重复记录

Question

什么是sql查询,以查找重复记录并以降序显示,基于最高计数和id显示记录.

例如:

得到计数可以完成

select title, count(title) as cnt from kmovies group by title order by cnt desc

结果就像

title cnt

ravi   10
prabhu  9
srinu   6

现在获取结果的查询是什么,如下所示:

ravi
ravi
ravi
...10 times
prabhu
prabhu..9 times
srinu
srinu...6 times

Answer 1

如果您的RDBMS支持OVER子句......

SELECT
   title
FROM
    (
    select
       title, count(*) OVER (PARTITION BY title) as cnt
    from
      kmovies
    ) T
ORDER BY
   cnt DESC

Answer 2

您可以在一个查询中执行此操作:

Select t.Id, t.title, z.dupCount
From yourtable T
Join
   (select title, Count (*) dupCount
    from yourtable 
    group By title
    Having Count(*) > 1) z
   On z.title = t.Title
order By dupCount Desc

Answer 3

此查询使用Group Byand和Having子句允许您为每个重复记录选择(定位和列出).该As子句便于Quantity在select和Order By子句中引用,但实际上并不是获取重复行的一部分.

Select
    Title,
    Count( Title ) As [Quantity]
   From
    Training
   Group By
    Title
   Having 
    Count( Title ) > 1
   Order By
    Quantity desc