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UPDATE INF_SUBSCRIBER T1
SET SUB_LEVEL = (SELECT CASE
WHEN SUM(FEE) > 100 THEN
'A'
WHEN SUM(FEE) < 50 THEN
NULL
ELSE
'B'
END
FROM INF_PRODUCT T2, REL_ORDER T3
WHERE T3.SUB_ID = T1.SUB_ID
AND T2.PROD_ID = T3.PROD_ID)
WHERE EXISTS (SELECT 1 FROM REL_ORDER T4 WHERE T4.SUB_ID = T1.SUB_ID);