sql - MySQL UPDATE syntax with multiple tables using WHERE clause

Question

Case:

How to update table1 with data from table2 where id is equal?

Problem:

When I run the following update statement, it updates all the records in table1 (even where the id field in table1 does not exist in table2).

How can I use the the multiple update table syntax, to update ONLY the records in table1 ONLY where the id is present in table2 and equal?

UPDATE table1,table2
SET table1.value=table2.value 
WHERE table2.id=table1.id

Thanks in advance.

Answer 1

here's the correct syntax of UPDATE with join in MySQL

UPDATE  table1 a
        INNER JOIN table2 b
            ON a.ID = b.ID
SET     a.value = b.value 

• SQLFiddle Demo