I have a question regarding a FULL OUTER JOIN in MySQL. I have two (or more tables):
table1 table2 id value id value2 1 a 1 b 2 c 3 d 3 e 4 f
I have used this query to get my join:
SELECT *
FROM table1
LEFT OUTER JOIN table2
ON table1.`id`=table2.`id`
UNION
SELECT *
FROM table1
RIGHT OUTER JOIN table2
ON table1.`id`=table2.`id`
to get:
id value1 id value2 1 a 1 b 2 c NULL NULL 3 e 3 d NULL NULL 4 f
My problem is that I don't manage to simultaneously collapse the two id columns into one column to get this:
id value1 value2 1 a b 2 c NULL 3 e d 4 NULL f
Any suggestions on how to do it?
SELECT
COALESCE(t1.id, t2.id) as id,
t1.value1,
t2.value2
FROM table1 t1
FULL JOIN table2 t2 ON t1.id = t2.id;