How can I compare these two strings in SQL Server? - sql

Question

So I need to compare a string against another string to see if any parts of the string match. This would be useful for checking if a list of salespeople IDs against the ones that are listed to a specific GM or if falls outside of that GMs list of IDs:
ID_SP ID_GM NEEDED FIELD (overlap)
136,338,342 512,338,112 338
512,112,208 512,338,112 512,112
587,641,211 512,338,112 null
I'm struggling on how to achieve this. I'm guessing some sort of UDF?
I realize this would be much easier to have done prior to using the for XML path(''), but I'm hoping for a solution that doesn't require me to unravel the data as that will blow up the overall size of the dataset.

Answer 1

No, that is not how you do it. You would go back to the raw data. To get the ids in common:
select tbob.id
from t tbob join
t tmary
on tbob.id = tmary.id and tbob.manager = 'Bob' and tmary.manager = 'Mary';

Answer 2

Since the data set isn't two raw sources, but one 'concatenated field' and a hardcoded string field that is a list of GMIDs (same value for every row) then the correct answer (from the starting point of the question) is to use something like nodes('/M') as Split(a).
Then you get something like this:
ID_SP ID_GM
136 512,338,112
338 512,338,112
342 512,338,112
and can do something like this:
case when ID_GM not like '%'+ID_SP+'%'then 1 else 0 end as 'indicator'
From here you can aggregate back and sum the indicator field and say that if > 0 then the ID_SP exists in the list of ID_GMs
Hope this helps someone else.

Answer 3

-- Try This
Declare #String1 as varchar(100)='512,112,208';
Declare #String2 as varchar(100)='512,338,112';
WITH FirstStringSplit(S1) AS
(
SELECT CAST('<x>' + REPLACE(#String1,',','</x><x>') + '</x>' AS XML)
)
,SecondStringSplit(S2) AS
(
SELECT CAST('<x>' + REPLACE(#String2,',','</x><x>') + '</x>' AS XML)
)
SELECT STUFF(
(
SELECT ',' + part1.value('.','nvarchar(max)')
FROM FirstStringSplit
CROSS APPLY S1.nodes('/x') AS A(part1)
WHERE part1.value('.','nvarchar(max)') IN(SELECT B.part2.value('.','nvarchar(max)')
FROM SecondStringSplit
CROSS APPLY S2.nodes('/x') AS B(part2)
)
FOR XML PATH('')
),1,1,'')

Answer 4

Gordon is correct, that you should not do this. This ought do be done with the raw data. the following code will "go back to the raw data" and solve this with an easy INNER JOIN.
The CTEs will create derived tables (all the many rows you want to avoid) and check them for equality (Not using indexes! One more reason to do this in advance):
DECLARE #tbl TABLE(ID INT IDENTITY,ID_SP VARCHAR(100),ID_GM VARCHAR(100));
INSERT INTO #tbl VALUES
('136,338,342','512,338,112')
,('512,112,208','512,338,112')
,('587,641,211','512,338,112');
WITH Splitted AS
(
SELECT t.*
,CAST('<x>' + REPLACE(t.ID_SP,',','</x><x>') + '</x>' AS xml) AS PartedSP
,CAST('<x>' + REPLACE(t.ID_GM,',','</x><x>') + '</x>' AS xml) AS PartedGM
FROM #tbl AS t
)
,SetSP AS
(
SELECT Splitted.ID
,Splitted.ID_SP
,x.value('text()[1]','int') AS SP_ID
FROM Splitted
CROSS APPLY PartedSP.nodes('/x') AS A(x)
)
,SetGM AS
(
SELECT Splitted.ID
,Splitted.ID_GM
,x.value('text()[1]','int') AS GM_ID
FROM Splitted
CROSS APPLY PartedGM.nodes('/x') AS A(x)
)
,BackToYourRawData AS --Here is the point you should do this in advance!
(
SELECT SetSP.ID
,SetSP.SP_ID
,SetGM.GM_ID
FROM SetSP
INNER JOIN SetGM ON SetSP.ID=SetGM.ID
AND SetSP.SP_ID=SetGM.GM_ID
)
SELECT ID
,STUFF((
SELECT ',' + CAST(rd2.SP_ID AS VARCHAR(10))
FROM BackToYourRawData AS rd2
WHERE rd.ID=rd2.ID
ORDER BY rd2.SP_ID
FOR XML PATH('')),1,1,'') AS CommonID
FROM BackToYourRawData AS rd
GROUP BY ID;
The result
ID CommonID
1 338
2 112,512