按顺序编号分组 [英] Group by numbers that are in sequence
本文介绍了按顺序编号分组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一些这样的数据:
row id
1 1
2 36
3 37
4 38
5 50
6 51
我要查询它看起来像这样:
I would like to query it to look like this:
row id group
1 1 1
2 36 2
3 37 2
4 38 2
5 50 3
6 51 3
...以便我可以按数字连续的方式按GROUP BY.
... so that I can GROUP BY where the numbers are consecutively sequential.
另外,循环/游标也是不可能的,因为我正在处理大量数据,谢谢.
Also, looping/cursoring is out of the question since I'm working with a pretty large set of data, thanks.
推荐答案
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
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