Ouch. You don't know this yet, but in SAS code like this:
PROC SQL FULLSTIMER;
CREATE TABLE PCLIB.NEED (COMPRESS=ON) AS
SELECT
A.COL1,
CASE WHEN B.COL2 NE '' THEN B.COL2 ELSE A.COL3 END AS COL4,
SUM(COL5) AS COL6,
SUM(COL7) AS COL8
FROM (SELECT * FROM PCLIB.TABLE1 UNION
SELECT * FROM PCLIB.TABLE2 UNION
SELECT * FROM PCLIB.TABLE3 UNION
SELECT * FROM PCLIB.TABLE4 UNION
SELECT * FROM PCLIB.TABLE5 UNION
SELECT * FROM PCLIB.TABLE6
) AS A
LEFT JOIN TABLE_db B ON A.ID=B.ID
GROUP BY
COL1,
COL4;
QUIT;
is a recipe for disaster. Complex joins of large tables cause SAS to create a utility file in WORK following the "everything including the kitchen sink", and that exceeds your storage. It also takes unnecessarily long.
In which tables are COL5 and COL7 contained?
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