Update multiple rows using select statement

Question

I have these tables and values:

Table1
------------------------
ID | Value
------------------------
2 | asdf
4 | fdsa
5 | aaaa


Table2
---------------------         


        

Answer 1

You can use alias to improve the query:

UPDATE t1
   SET t1.Value = t2.Value
  FROM table1 AS t1
         INNER JOIN 
       table2 AS t2
         ON t1.ID = t2.ID