SQL INSERT ISSUE WITH CTE - sql

Question

I have the following query that I am working on. The goal is to insert the [AppID] and randomly selected [ufid] that meet the criteria in the where clause without inserting duplicates. I have researched the TABLESAMPLE and Random() but was unable to figure this out.
For example: #mult_nuf table has 4 records with the AppID = 123456 and Major = 'GEBOX'. The #temp_rUF will have a record in the table with the ufid = 'UF7' and sh_plan = 'GEBOX'.I need to insert the [App_ID] and the [ufid] of another [sh_plan] into a temp table WHERE the [Major] and [sh_plan] are NOT be the same. So far a record for every [ufid] is being inserted with the same [Appid]. I have 45 [ufid} in the table so the temp table has 45 records for the same [AppID]. Should only be 4 records for the [AppID] with 4 random [ufid]..
mult_nuf table
AppID Major
004540036 GEBOX
004540036 GEBOX
004540036 GEBOX
004540036 GEBOX
The #temp_ruf table
ufID sh_Plan
U1 GECCE
U2 REDSG
U5 GFRTY
U7 GEBOX
U8 JKIUTY
Sample Output should look like
App_ID ufID
004540036 U1
004540036 U2
004540036 U5
004540036 U8
Query I am working with
WITH Match_NomineesWithReviewers AS
(
SELECT DISTINCT
[AppID],
RTRIM(Major) AS Major
FROM
#mult_nuf
)
SELECT
m.[AppID],
r.ufid
INTO
#TempNTable
FROM
Match_NWithR m
CROSS APPLY
(SELECT ir.ufid
FROM #temp_rUF ir
WHERE m.Major <> ir.sh_plan) r

Answer 1

Assuming you want to do this on a set of AppID's, I'd use ROW_NUMBER and ORDER BY newid() for random, then limit to the first 4 results, something like this:
WITH Match_NomineesWithReviewers AS
(
SELECT
[AppID],
RTRIM(Major) AS Major
FROM
#mult_nuf
GROUP BY
[AppID],
RTRIM(Major)
)
, rownum_matches AS (
SELECT
m.[AppID],
r.ufid,
ROW_NUMBER() OVER (PARTITION BY m.[AppID] ORDER BY newid()) AS rownum
FROM
Match_NomineesWithReviewers m
JOIN
#temp_rUF t ON t.sh_Plan != m.Major
)
SELECT [AppID], ufid FROM rownum_matches WHERE rownum <= 4
If you need it to match the original number of records, maybe something like this:
WITH Match_NomineesWithReviewers AS
(
SELECT
[AppID],
RTRIM(Major) AS Major,
COUNT(1) AS rowcnt
FROM
#mult_nuf
GROUP BY
[AppID],
RTRIM(Major)
)
, rownum_matches AS (
SELECT
m.[AppID],
r.ufid,
m.rowcnt,
ROW_NUMBER() OVER (PARTITION BY m.[AppID] ORDER BY newid()) AS rownum
FROM
Match_NomineesWithReviewers m
JOIN
#temp_rUF t ON t.sh_Plan != m.Major
)
SELECT [AppID], ufid FROM rownum_matches rm WHERE rownum <= rowcnt

Answer 2

You can try something like this. It should work if the appid's are all the same.
INSERT INTO ATempTable
SELECT TOP (SELECT COUNT(1) FROM mult_nuf) Appid,
ufID
FROM
(SELECT DISTINCT *
FROM mult_nuf
CROSS JOIN temp_ruf
WHERE major <> sh_plan) BaseQuery
ORDER BY NEWID()