Question

Once I run this query I get the following error

UPDATE stockloan_feed 
SET CUSIP =( 
      SELECT CUSIP FROM stockloan_feed_cusip_matching 
      WHERE stockloan_feed_cusip_matching.SEDOL = stockloan_feed.SEDOL OR       
      stockloan_feed_cusip_matching.ISIN = stockloan_feed.ISIN) 
WHERE CUSIP IS NULL and date = DATEDIFF(d, 0, GETDATE()-1)

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Answer 1

UPDATE t1
SET t1.CUSIP = t2.CUSIP
FROM  stockloan_feed t1
INNER JOIN stockloan_feed_cusip_matching t2 
        ON t2.SEDOL = t1.SEDOL 
        OR t2.ISIN  = t1.ISIN
WHERE t1.CUSIP IS NULL
  AND t1.date = DATEDIFF(d, 0, GETDATE()-1)