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

[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



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:

Code: [Select]

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

[Mchl]

Not at all.

Use join in UPDATE's table reference clause

Code: [Select]

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

[rahulephp]

Thank you buddy,
I got the solutions. Here it is:

Code: [Select]

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

[Mchl]

That's pretty much the same, except I used aliases to make it less verbose.

[rahulephp]

Yeah.. i am thankful to you for this