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Mysql - How to use UPDATE with SELECT???

Posted: Fri Jul 30, 2010 2:15 am
by rahulephp
Mysql - How to use UPDATE with SELECT???

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
Image


related_category table
Image


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:

Code: Select all

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

Re: Mysql - How to use UPDATE with SELECT???

Posted: Fri Jul 30, 2010 3:44 am
by Christopher
First of all, you don't want to duplicate the name. Just join the tables when you want the related information. Otherwise you could use REPLACE.

Re: Mysql - How to use UPDATE with SELECT???

Posted: Fri Jul 30, 2010 3:59 am
by rahulephp
Thank you buddy,
I got the solutions. Here it is:

Code: Select all

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