Update data from another Table

UPDATE (
SELECT b.col1 as old_col1,
       b.col2 as old_col2,
       b.col3 as old_col3,
       t.col1 as new_col1,
       t.col2 as new_col2,
       t.col3 as new_col3 
  FROM bigTable b, tempTable t
 WHERE b.col = t.col)
   SET old_col1 = new_col1,
       old_col2 = new_col2,
       old_col3 = new_col3;

參考 http://blog.csdn.net/yuhua3272004/article/details/2776121