Question

I have the following two tables:

TableA

article_id | attribute_id
1          | 5
2          | 6

TableB

attribute_id | attribute_name
5            | foo
6            | bar

How would I get the corresponding row if I only know the article id? So if I pass article_id 1 I get:

article_id | attribute_id | attribute_name
1          | 5            | foo

I know I could do it with two separate queries but was wondering if it could be done in one? I thought about using INNER JOIN ON but article_id isn’t in both tables?

Thanks

Answer 1

For sure, you can (and have to) use INNER JOIN.

SELECT TableA.article_id, TableB.*
FROM TableA
INNER JOIN TableB ON TableA.attribute_id = TableB.attribute_id
WHERE TableA.article_id = 1

The SELECT part let us retrieve article_id from the first table, and all fields from the second one.
The INNSER JOIN clause joins rows that have the same attribute_id from the two tables.
The WHERE condition let us select only the row with article_id = 1 in first table.