sql server update select join code example

Example 1: update with join sql server

UPDATE 
    t1
SET 
    t1.c1 = t2.c2,
    t1.c2 = expression,
    ...   
FROM 
    t1
    [INNER | LEFT] JOIN t2 ON join_predicate
WHERE 
    where_predicate;

Example 2: update from select join

UPDATE t1
SET t1.COL1 = t2.COL1, t1.COL2 = t2.COL2
FROM my_table AS t1
JOIN my_other_table AS t2 ON t1.COLID = t2.ID
WHERE t1.COL3 = 'OK';