MySQL: Left join and column with the same name in different tables?

Question

SELECT * FROM `product` left join category on product.category_id = category.id

This query works fine. But the problem is, both the product table a

Answer 1

You can add aliases to the fields:

SELECT
    a.id,
    a.name,
    a.category_id,
    b.id AS catId,
    b.name AS catName
FROM
    product AS a
LEFT JOIN
    category AS b ON a.category_id = b.category.id

Answer 2

Use aliases with the AS keyword:

SELECT p.id AS product_id, p.name AS product_name, c.id AS cat_id, c.name AS cat_name
FROM `product` AS p
LEFT JOIN category AS c ON p.category_id = c.id

Answer 3

try this:

SELECT product.id AS productid, 
       category.id AS categoryid, ...
FROM `product` left join category 
       on product.category_id = category.id

Answer 4

use the "AS" keyword like

SELECT product.id AS pid, category.id AS cid ... FROM `product` left join category on product.category_id = category.id

Answer 5

I had a similar problem working with MySQL in a Node.js project.

I found that if you still want to use select * instead of listing out all columns and using an alias, the following works:

SELECT *, category.id AS cId, category.name AS cName 
FROM product LEFT JOIN category ON product.category_id = category.id

In other words, just create aliases for the joined columns that have conflicting names. You don't need aliases on other columns or on the table names.

Answer 6

SELECT p.*,c.* FROM product p LEFT JOIN category c on p.category_id = c.id;