SQL Join with 2 conditions same column but different data names - sql-server

Question

I need to join 2 tables using 2 columns as identifiers,
Reference and UAP
TABLE 1
Reference
UAP
Week 1
Week 2
Table 2
Reference
UAP
Stock
Here is the problem with data on both tables in UAP column
Table 1 Table 2
UAP1 M1
UAP2 M2
UAP3 M3
UAP4 M4
UAP5 M5
UAP6 M6
UAPP PROTOS
EXT EXTR
the UAPS are the same but name is just different
I have no control over the data i'm getting, it's a IBM DB2 remote server
I tried a local table to join but i want to avoid that 'cause of the performance impact (30+ seconds)
So far my query is this
SELECT
*
FROM OPENQUERY(MACPAC,
'SELECT
P.Referencia,
P.UAP,
P.W01,
P.W02,
S.Stock
FROM AUTO.D805DATPOR.Production AS P
INNER JOIN AUTO.D805DATPOR.Stock S
ON S.Reference = S.Reference
WHERE (P.Reference Not Like ''FS%'')
ORDER BY Reference')
well of course the ideal would be
SELECT
*
FROM OPENQUERY(MACPAC,
'SELECT
P.Referencia,
P.UAP,
P.W01,
P.W02,
S.Stock
FROM AUTO.D805DATPOR.Production AS P
INNER JOIN AUTO.D805DATPOR.Stock S
ON P.Reference = S.Reference AND P.UAP = S.UAP
WHERE (P.Reference Not Like ''FS%'')
ORDER BY Reference')
but it does not work cause different names... Is there a way to make this happen without a local join table that will slow my query by several seconds?
Here is the output of these queries individually
This is the production table
This is the stock table
the output should show me the Stock on the production table by Reference and UAP
EDIT
Sorry for confusion the remote server is IBM DB2. This was an error of my coworker that said it was coming from oracle--
Cheers for correct answer from #Sergey Menshov.
SELECT
Reference,
UAP,
W01,
W02
FROM OPENQUERY(MACPAC,
'SELECT
P.Reference,
P.UAP,
P.W01,
P.W02
FROM AUTO.D805DATPOR.Production AS P
LEFT JOIN AUTO.D805DATPOR.Stock S
ON P.Reference = S.Reference AND
S.UAP =
CASE P.UAP
WHEN ''UAP1'' THEN ''M1''
WHEN ''UAP2'' THEN ''M2''
WHEN ''UAP3'' THEN ''M3''
WHEN ''UAP4'' THEN ''M4''
WHEN ''UAP5'' THEN ''M5''
WHEN ''UAP6'' THEN ''M6''
WHEN ''UAPP'' THEN ''PROTOS''
WHEN ''EXT'' THEN ''EXTR''
END
WHERE (P.Reference Not Like ''FS%'')
ORDER BY Reference DESC')
another method which gives error in UAP1 not a column in table L that might work using dual table for DB2
SELECT
Reference,
UAP,
W01,
W02
FROM OPENQUERY(MACPAC,
'SELECT
P.Reference,
P.UAP,
P.W01,
P.W02
FROM AUTO.D805DATPOR.Production AS P
JOIN
(
SELECT ''UAP1'' AS UAP1, ''M1'' AS UAP2 FROM sysibm.sysdummy1
UNION ALL SELECT ''UAP2'',''M2'' FROM sysibm.sysdummy1
UNION ALL SELECT ''UAP3'',''M3'' FROM sysibm.sysdummy1
UNION ALL SELECT ''UAP4'',''M4'' FROM sysibm.sysdummy1
UNION ALL SELECT ''UAP5'',''M5'' FROM sysibm.sysdummy1
UNION ALL SELECT ''UAP6'',''M6'' FROM sysibm.sysdummy1
UNION ALL SELECT ''UAPP'',''PROTOS'' FROM sysibm.sysdummy1
UNION ALL SELECT ''EXT'',''EXTR'' FROM sysibm.sysdummy1
) L
ON P.UAP = L.UAP1
INNER JOIN AUTO.D805DATPOR.Stock S
ON P.Reference = S.Reference AND S.UAP = L.UAP2
WHERE (P.Reference Not Like ''FS%'')
ORDER BY Reference DESC')

Answer 1

Try to use a link-subquery:
FROM AUTO.D805DATPOR.Production AS P
JOIN
(
SELECT ''UAP1'' AS UAP1,''M1'' AS UAP2 FROM DUAL
UNION ALL SELECT ''UAP2'',''M2'' FROM DUAL
UNION ALL SELECT ''UAP3'',''M3'' FROM DUAL
UNION ALL SELECT ''UAP4'',''M4'' FROM DUAL
UNION ALL SELECT ''UAP5'',''M5'' FROM DUAL
UNION ALL SELECT ''UAP6'',''M6'' FROM DUAL
UNION ALL SELECT ''UAPP'',''PROTOS'' FROM DUAL
UNION ALL SELECT ''EXT'',''EXTR'' FROM DUAL
) L
ON P.UAP=L.UAP1 -- !!!
INNER JOIN AUTO.D805DATPOR.Stock S
ON P.Reference = S.Reference AND S.UAP=L.UAP2 -- !!!
Or you can create a link-table in the Oracle and then use it in your query.
I think it'll be better because you can use it in other queries and insert there a new combinations.
Pseudo code:
CREATE TABLE UAP_LINK(
UAP1 VARCHAR2(20) NOT NULL,
UAP2 VARCHAR2(20) NOT NULL,
PRIMARY KEY(UAP1),
UNIQUE(UAP2)
)
INSERT UAP_LINK VALUES
UAP1, M1
UAP2, M2
UAP3, M3
UAP4, M4
UAP5, M5
UAP6, M6
UAPP, PROTOS
EXT , EXTR
One more variant with CASE:
FROM AUTO.D805DATPOR.Production AS P
INNER JOIN AUTO.D805DATPOR.Stock S
ON P.Reference = S.Reference
AND S.UAP=
CASE P.UAP
WHEN ''UAP1'' THEN ''M1''
WHEN ''UAP2'' THEN ''M2''
WHEN ''UAP3'' THEN ''M3''
WHEN ''UAP4'' THEN ''M4''
WHEN ''UAP5'' THEN ''M5''
WHEN ''UAP6'' THEN ''M6''
WHEN ''UAPP'' THEN ''PROTOS''
WHEN ''EXT'' THEN ''EXTR''
END