SQL Server选择具有计数的行到列

假设我在sql server中有下表：

CREATE TABLE [dbo].[Table1](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Title] [nvarchar](max) NOT NULL,
    [Value] [int] NOT NULL,
 CONSTRAINT [PK_Table1] PRIMARY KEY;

，以及表中的这些值：

ID  Title   Value
1     A     1
2     B     2
3     C     3
4     D     4
5     E     1
6     F     1
7     G     3

，并假设每个标题最多可重复3次。我只想从该表中具有重复值的标题中获得以下格式的输出：

Titl1   Title2   Title3  RepeatCount
A      E     F     3
C     G     NULL     2

我编写了一个查询以获取重复项，但不知道如何在单个查询中将输出转换为这种格式。这是获取重复项的查询：

SELECT DISTINCT t1.Title, t1.Value,
      (SELECT Count(Value) from Table1 where Table1.Value = t1.Value) as RepeatCount
FROM Table1 t1 INNER JOIN
     Table1 t2
     ON t1.Title <> t2.Title AND t1.Value = t2.Value
ORDER BY Value

---

有什么想法吗？

我认为这是一个条件聚合查询：

select max(case when seqnum = 1 then title end) as title1,
       max(case when seqnum = 2 then title end) as title2,
       max(case when seqnum = 3 then title end) as title3,
       count(*) as repeatcount
from (select t.*,
             row_number() over (partition by value order by id) as seqnum
      from table1 t
     ) t
group by value
having count(*) > 1;

---

我认为这是一个条件聚合查询：

select max(case when seqnum = 1 then title end) as title1,
       max(case when seqnum = 2 then title end) as title2,
       max(case when seqnum = 3 then title end) as title3,
       count(*) as repeatcount
from (select t.*,
             row_number() over (partition by value order by id) as seqnum
      from table1 t
     ) t
group by value
having count(*) > 1;

---

另一种方法

declare @t table(ID int,Title varchar(20),Value int)
insert into @t values
(1,'A',1)
,(2,'B',2)
,(3,'C',3)
,(4,'D',4)
,(5,'E',1)
,(6,'F',1)
,(7,'G',3)
;With CTE as
(
SELECT *
,ROW_NUMBER()over(partition by Value order by Value)rn 
from @t
)
,CTE1 AS
(
SELECT * 
from cte c
where exists(
select * from cte c1    
where c1.value=c.value and c1.rn>1
)
)


select 
        (select title from cte1 c1 where c.value=c1.value and  rn = 1)title1
       ,(select title from cte1 c1 where c.value=c1.value and  rn = 2) title2
      ,(select title from cte1 c1 where c.value=c1.value and  rn = 3) title3
      ,(select max(rn) from cte1 c1 where c.value=c1.value) RepeatCount
from cte1 c

where rn=1

---

另一种方法

declare @t table(ID int,Title varchar(20),Value int)
insert into @t values
(1,'A',1)
,(2,'B',2)
,(3,'C',3)
,(4,'D',4)
,(5,'E',1)
,(6,'F',1)
,(7,'G',3)
;With CTE as
(
SELECT *
,ROW_NUMBER()over(partition by Value order by Value)rn 
from @t
)
,CTE1 AS
(
SELECT * 
from cte c
where exists(
select * from cte c1    
where c1.value=c.value and c1.rn>1
)
)


select 
        (select title from cte1 c1 where c.value=c1.value and  rn = 1)title1
       ,(select title from cte1 c1 where c.value=c1.value and  rn = 2) title2
      ,(select title from cte1 c1 where c.value=c1.value and  rn = 3) title3
      ,(select max(rn) from cte1 c1 where c.value=c1.value) RepeatCount
from cte1 c

where rn=1