T-SQL : Cleaning up data, merging rows into columns - sql-server

Question

I'm trying to clean up some Active Directory data in SQL Server. I have managed to read the raw LFD file into a table. Now I need to clean up some attributes where values are spread out over multiple rows. I can identify records that need to be appended to the prior record by the fact the have a leading space.
Example:
ID Record IsPartOfPrior
3114 memberOf: 0
3115 CN=Sharepoint-Members-home 1
3116 memberOf: 0
3117 This is 1
3118 part of the 1
3119 next line. 1
Ultimately, I would like to have the following table generated:
ID Record
3114 memberOf:CN=Sharepoint-Members-home
3116 memberOf:This is part of the next line
I could write it through a cursor, setting variables, working with temp tables and populating a table. But there has to be a set based (maybe recursive?) approach to this?
I could use the STUFF method to combine various rows together, but how am I about to group the various sets together? I'm thinking that I first have to define groupID's per record, and then stuff them together per groupID?
Thanks for any help.

Answer 1

Batch with comments below. Should work starting with SQL Server 2008.
--Here I emulate your table
DECLARE #yourtable TABLE (ID int, Record nvarchar(max), IsPartOfPrior bit)
INSERT INTO #yourtable VALUES
(3114,'memberOf:',0),(3115,'CN=Sharepoint-Members-home',1),(3116,'memberOf:',0),(3117,'This is',1),(3118,'part of the',1),(3119,'next line.',1)
--Getting max ID
DECLARE #max_id int
SELECT #max_id = MAX(ID)+1
FROM #yourtable
--We get next prior for each prior record
--And use STUFF and FOR XML PATH to build new Record
SELECT y.ID,
y.Record + b.Record as Record
FROM #yourtable y
OUTER APPLY (
SELECT TOP 1 ID as NextPrior
FROM #yourtable
WHERE IsPartOfPrior = 0 and y.ID < ID
ORDER BY ID ASC
) as t
OUTER APPLY (
SELECT STUFF((
SELECT ' '+Record
FROM #yourtable
WHERE ID > y.ID and ID < ISNULL(t.NextPrior,#max_id)
ORDER BY id ASC
FOR XML PATH('')
),1,1,'') as Record
) as b
WHERE y.IsPartOfPrior = 0
The output:
ID Record
----------- -----------------------------------------
3114 memberOf:CN=Sharepoint-Members-home
3116 memberOf:This is part of the next line.
This will work if ID are numeric and ascending.

Answer 2

Yet another option if 2012+
Example
Declare #YourTable Table ([ID] int,[Record] varchar(50),[IsPartOfPrior] int)
Insert Into #YourTable Values
(3114,'memberOf:',0)
,(3115,'CN=Sharepoint-Members-home',1)
,(3116,'memberOf:',0)
,(3117,'This is',1)
,(3118,'part of the',1)
,(3119,'next line.',1)
;with cte as (
Select *,Grp = sum(IIF([IsPartOfPrior]=0,1,0)) over (Order By ID)
From #YourTable
)
Select ID
,Record = Stuff((Select ' ' +Record From cte Where Grp=A.Grp Order by ID For XML Path ('')),1,1,'')
From (Select Grp,ID=min(ID)from cte Group By Grp ) A
Returns
ID Record
3114 memberOf: CN=Sharepoint-Members-home
3116 memberOf: This is part of the next line.
If it Helps with the Visualization, the cte Produces:
ID Record IsPartOfPrior Grp << Notice Grp Values
3114 memberOf: 0 1
3115 CN=Sharepoint-Members-home 1 1
3116 memberOf: 0 2
3117 This is 1 2
3118 part of the 1 2
3119 next line. 1 2