How to update multiple rows in mysql

Question

I have importing table in my database. This table columns are product_id and ext_product_id . Product_id is unique, but ext_product_id in table has same. I have to update this multiple ext_product_id . My table has thousands of columns. I can't manualy update these rows.

my table foramt is:

    product_id     ext_product_id
      44            796666
      45            796666
      46            796666
      306           1275631
      308           1275631
      309           1275631 
       .             .

i have table foramt like this:

    my table foramt is:

    product_id     ext_product_id
      44            796666
      45            796667
      46            796668
      306           1275631
      308           1275632
      309           1275633 
       .             .

How to update this ?

My query only works with a single record:

   update 13_product_id 
   set ext_product_id='796667'
   where product_id='45';

I have to update multiple rows, please give me a suggestion.

Answer 1

Try updating where your IDs are in:

 update 13_product_id 
   set ext_product_id='796666'
   where product_id in ('45','16','15');

etc, etc

Answer 2

Well depending on what you want to do you can add multiple ids into the loop so instead of

where product_id = 45

You could have

where product_id in (45,46,47,48)

Answer 3

If you know the product_id's to update, use IN like this:

update product_id 
set ext_product_id='796666'
where product_id IN (45, 46, 386...);

Or, if you want to update all rows with that ext_product_id, just drop your "where" clause::

update product_id 
set ext_product_id='796666'

Answer 4

Are you trying to update all rows that have the same extended product as '45' ? If so, this should do what you want:

update 13_product_id toupdate join
       (select ext_product_id
        from 13_product_id
        where product_id = '45'
       ) t
       on toupdate.ext_product_id = t.ext_product_id
   set toupdate.ext_product_id = '796667';