sql query for counting the records of particular id and show in column答案

【问题标题】：sql query for counting the records of particular id and show in columnsql query for counting the records of particular id and show in column
【发布时间】：2022-12-01 21:22:40
【问题描述】：

I have a following table:-

declare @tab table(name varchar(10),id int)

insert into @tab values ('A',1),('B',1),('C',1),('D',1),('E',2),('F',2)

I need following output:-

declare @tab1 table(name varchar(10),id int, cnt int)

insert into @tab1 values ('A',1,4),('B',1,4),('C',1,4),('D',1,4),('E',2,2),('F',2,2)
select * from @tab1

I tried following query:-

select name,id,count(*) as cnt
from @tab 
group by name,id

Thanks

【问题讨论】：

Remove sql-server-2012 tag, because it's no longer supported. Also, very unclear question. What do you want, what do you get with the code you've tried? Please, edit

标签： sql sql-server sql-server-2012

【解决方案1】：

Done

;with a as
(
select Id,name, count(*) over (partition by id) cnt

from @tab
)
select Id,name,cnt
from a

【讨论】：

【解决方案2】：

Try this

select name
     , id
     , count(*) over(partition by id) as cnt
from @tab
;

【讨论】：