Comma separated value string and compare against other values

Question

Comma separated value string and compare against other values

SSC Veteran

Points: 272

May 12, 2021 at 8:43 pm

Hey all I have been trying to wrap my head around how to go about doing this for a while now and I'm not really coming up with anything.

Here is my query:

DECLARE @ATID AS VARCHAR(3) = 12
DECLARE @AssetID AS VARCHAR(7) = 306

SELECT 
    tblXDataA.AssetID AS 'LID',
    tblA.AssetID AS 'AID',
    tblEM.[Custom] AS 'ABC/S XML',
    tblEMXData.[Custom] AS 'XData XML',
    tblEM.[Custom].value('(/ABCS/text())[1]', 'varchar(MAX)') AS 'Parsed XML -> ABCS',
    tblEM.[Custom].value('(/ABC/text())[1]', 'varchar(MAX)') AS 'Parsed XML -> ABC',
    tblEMXData.[Custom].value('(/XData/ABC/text())[1]', 'varchar(MAX)') AS 'Parsed XML -> XData'
FROM 
    Asset AS tblA 
JOIN 
    LinkStr AS tblL 
        ON tblL.A_AssetID = tblA.AssetID 
JOIN 
    Asset AS tblXDataA 
        ON tblXDataA.AssetID = tblL.B_AssetID 
JOIN
    EMd AS tblEMXData
        ON tblEMXData.AssetID = tblXDataA.AssetID
JOIN 
    EMd AS tblEM 
        ON tblEM.AssetID = tblA.AssetID 
JOIN 
    LinkStr AS tbLinkStrB 
        ON tblXDataA.AssetID = tbLinkStrB.B_AssetID 
WHERE 
    tblXDataA.ATID = @ATID 
AND 
    tblA.AssetID = @AssetID;

All of that above produces a few columns of output but the main columns are the ABCS and XData:

LID | AID | Parsed XML -> ABCS                                    | Parsed -> XData 
------------------------------------------------------------------------------------------------------------
481 | 306 | Y40GB4DL4-48302343420105-FH3J-8798-11240,05649880-ED43| Y40GB4DL4-48302343420105-FH3J-8798-11240
501 | 306 | Y40GB4DL4-48302343420105-FH3J-8798-11240,05649880-ED43| 05649880-ED43

The above is correct as-is. There are 2 users and therefore the ABCS has a comma delimiter with both users ABCS. The first user that is added is the main user that all other users go under and therefore it has the same user ID for both [306].

The users ABCS are:

User 1 [main] : Y40GB4DL4-48302343420105-FH3J-8798-11240
User 2 [addition]: 05649880-ED43

However, If I delete the last user added [05649880-ED43] then ABCS should only have 1 users ABCS in it instead of 2. But this is how its turning out:

LID | AID | Parsed XML -> ABCS                                    | Parsed -> XData 
------------------------------------------------------------------------------------------------------------
481 | 306 | Y40GB4DL4-48302343420105-FH3J-8798-11240,05649880-ED43| Y40GB4DL4-48302343420105-FH3J-8798-11240

So depending on how many users are added to the main user is what I need to check for to make sure those users who get deleted are not left in the ABCS comma string.

Needing to:

Get each ABCS comma delimited value and compare it to XData(s)

So as the example above it would flow like this taken that the database looks like this:

LID | AID | Parsed XML -> ABCS                                    | Parsed -> XData 
------------------------------------------------------------------------------------------------------------
481 | 306 | Y40GB4DL4-48302343420105-FH3J-8798-11240,05649880-ED43| Y40GB4DL4-48302343420105-FH3J-8798-11240
501 | 306 | Y40GB4DL4-48302343420105-FH3J-8798-11240,05649880-ED43| 05649880-ED43

Is Y40GB4DL4-48302343420105-FH3J-8798-11240 [ABCS] present in [XData]? answer: true
Is 05649880-ED43 [ABCS] present in [XData]? answer: true
Since there are 2 users and 2 rows then that would, of course, return both as TRUE and that would be all.

Now If the added user gets deleted from the main user then the table would look like this and which is what currently is happening:

LID | AID | Parsed XML -> ABCS                                    | Parsed -> XData 
------------------------------------------------------------------------------------------------------------
481 | 306 | Y40GB4DL4-48302343420105-FH3J-8798-11240,05649880-ED43| Y40GB4DL4-48302343420105-FH3J-8798-11240

Is Y40GB4DL4-48302343420105-FH3J-8798-11240 [ABCS] present in [XData]? answer: true
Is 05649880-ED43 [ABCS] present in [XData]? answer: false

Since its true and false then the false users ABCS ID needs to be taken out [DELETED/REMOVED] of the comma separated string. This is what I am unable to find out how to go about doing.

Help would be great!

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The Dixie Flatline SSC Guru Points: 53354 More actions · Answer 1

Couple of ways to solve this. First, you could do the following.

Use the OUTPUT clause in conjuction with your delete to save the deleted AIDs to a temporary table.
Get the list of distinct AIDs from the temp table, and rebuild the comma delimited string for each AIDs
Update the remaining rows with the rebuilt string(s) from step 2

Second, you could just eliminate the [Parsed XML -> ABCS ] column as a persisted column, and just create it on the fly from the data in the various [Parsed -> XData] elements. Unfortunately this would mean reading all rows for each AID before presenting the results.

There may be other approaches, but this is what immediately comes to mind.

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ScottPletcher SSC Guru Points: 101095 More actions · Answer 2

If the delete of the added user is an actual delete from a table, then use an after delete trigger to remove added users from the main row at the time the row is deleted. You don't want to leave inconsistent data in the table even beyond just this one use of the table.

SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".