Aggregate function in an SQL update query?

Question

I\'m trying to set the value in one table to the sum of the values in another table. Something along these lines:

UPDATE table1
SET field1 = SUM(table2.fiel         


        

Answer 1

Or you could use a mix of JBrooks and OMG Ponies answers:

UPDATE table1
   SET field1 = (SELECT SUM(field2)
                   FROM table2 AS t2
                  WHERE t2.field3 = t1.field3)
  FROM table1 AS t1