SQL update query using joins

Question

I have to update a field with a value which is returned by a join of 3 tables.

Example:

select
    im.itemid
    ,im.sku as iSku
    ,gm.SKU as GSKU         


        

Answer 1

It is very simple to update using join query in SQL .You can do it without using FROM clause. Here is an example :

    UPDATE customer_table c 

      JOIN  
          employee_table e
          ON c.city_id = e.city_id  
      JOIN 
          anyother_ table a
          ON a.someID = e.someID

    SET c.active = "Yes"

    WHERE c.city = "New york";