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CREATE TABLE #t1
( col1 INT NOT NULL
, col2 INT NOT NULL
) ;

INSERT INTO #t1
VALUES
( 9, 1) ,
( 8, 2) ,
(10, 2) ;


UPDATE p1
    SET col1 = col1 * 2
    FROM  #t1 AS p1
    WHERE col1 <= (SELECT AVG(col1) FROM #t1 WHERE col2=p1.col2);

SELECT *
FROM #t1 ;

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edited apr 1 12

created apr 1 12 jon.doe6603