我有一些这样的数据:
row id
1 1
2 36
3 37
4 38
5 50
6 51
我想查询它看起来像这样:
row id group
1 1 1
2 36 2
3 37 2
4 38 2
5 50 3
6 51 3
...这样我就可以在GROUP BY中连续按顺序排列数字。
此外,循环/光标是不可能的,因为我正在处理大量数据,谢谢。
答案 0 :(得分:4)
with
data(row, id) as (
select *
from (
values
(1,1)
,(2,36)
,(3,37)
,(4,38)
,(5,50)
,(6,51)
) as foo(row, id)
),
anchor(row, id) as (
select row, id
from data d1
where not exists(select 0 from data d2 where d2.id = d1.id - 1)
)
select d1.*, dense_rank() over(order by foo.id) as thegroup
from
data d1
cross apply (select max(id) from anchor where anchor.id <= d1.id) as foo(id)
order by
d1.row
;
答案 1 :(得分:3)
;WITH firstrows AS
(
SELECT id, ROW_NUMBER() OVER (ORDER BY id) groupid
FROM Table1 a
WHERE id - 1 NOT IN (SELECT b.id FROM Table1 b)
)
SELECT id,
(
SELECT MAX(b.groupid)
FROM firstrows b
WHERE b.id <= a.id
) groupid
FROM Table1 a
答案 2 :(得分:1)
该解决方案在row
值序列可能存在差距的基础上做了更多必要的工作,并假设应忽略这些差距。
设置测试数据:
DECLARE @table TABLE
(ROW INT,
id INT
)
INSERT @table
SELECT 1,1
UNION SELECT 2,36
UNION SELECT 3,37
UNION SELECT 4,38
UNION SELECT 5,50
UNION SELECT 6,51
输出查询
;WITH grpCTE
AS
(
SELECT ROW, id,
ROW_NUMBER() OVER (ORDER BY ROW
) AS rn
FROM @table
)
,recCTE
AS
(
SELECT ROW, id, rn, 1 AS grp
FROM grpCTE
WHERE rn = 1
UNION ALL
SELECT g.row, g.id, g.rn, CASE WHEN g.id = r.id + 1 THEN r.grp ELSE r.grp + 1 END AS grp
FROM grpCTE AS g
JOIN recCTE AS r
ON g.rn = r.rn + 1
)
SELECT row, id, grp FROM recCTE
答案 3 :(得分:1)
create table #temp
(
IDUnique int Identity(1,1),
ID int,
grp int
)
Insert into #temp(ID) Values(1)
Insert into #temp(ID) Values(36)
Insert into #temp(ID) Values(37)
Insert into #temp(ID) Values(38)
Insert into #temp(ID) Values(50)
Insert into #temp(ID) Values(51)
declare @IDUnique int
declare @PreviousUnique int
declare @ID int
declare @grp int
declare @Previous int
declare @Row int
DECLARE @getAccountID CURSOR SET @getAccountID = CURSOR FOR SELECT Row_Number() Over(Order by IDUnique) Row, IDUnique, ID From #temp
OPEN @getAccountID
FETCH NEXT FROM @getAccountID INTO @Row, @IDUnique, @ID
WHILE @@FETCH_STATUS = 0
BEGIN
IF(@Row = 1)
Begin
update #temp set grp = 1 Where IDUnique = @IDUnique
set @Previous = @ID
set @grp = 1
End
Else If (@Previous + 1 = @ID)
Begin
update #temp set grp = @grp Where IDUnique = @IDUnique
set @Previous = @ID
End
Else
Begin
set @Previous = @ID
set @grp = @grp + 1
update #temp set grp = @grp Where IDUnique = @IDUnique
End
FETCH NEXT FROM @getAccountID INTO @Row, @IDUnique, @ID
END
CLOSE @getAccountID
DEALLOCATE @getAccountID
Select * from #temp
Drop Table #temp
答案 4 :(得分:1)
Select T.Id, T.Row, groupId as "Group", dr FROM tbrows T
Left Outer Join
(
Select min(id) as groupId,DENSE_RANK() over( order by min(id)) as dr, MIN(row-id) as d, Sum(1) as s FROM tbrows
Group BY (row-id)
) U
On (T.Id >= U.groupId) and (T.Id < U.groupId+U.s)
Order By T.Id