Mysql - How to use UPDATE with SELECT???

Hi,

I have two tables:
1) products_category
-cat_id
-cat_name

2) related_category
-rel_cat_id (exaclty same as products_category.cat_id==related_category.rel_cat_id)
-rel_cat_name


products_category table



related_category table


I want to get cat_name from products_category and want to store in rel_cat_name in related_category tabel. and the query should be only one.

Not sure how will it works.
I thought it would be something like:

UPDATE related_category 
SET related_category.rel_cat_name = 
( 
SELECT product_category.cat_name FROM product_category
INNER JOIN related_category
ON related_category.rel_cat_id = product_category.cat_id
)

Code (markup):

But it doesn't works,
Please assist. Thanks in advance

 

Best way would be to do a join.

UPDATE related_category 
INNER JOIN product_category 
ON related_category.rel_cat_id = product_category.cat_id
SET related_category.rel_cat_name = product_category.cat_name

Code (markup):

 

Thanks, thats exactly i was looking for. It works great for me.