I am having a bit of trouble with a query. I want to join tables if a case is met. This the query I'm working with. I'm kind of new to these case statements so any help is greatly appreciated!
SELECT
conversation.c_id,
conversation.user_one,
conversation.user_two,
users.name,
users.lastName
FROM `conversation`
CASE
WHEN conversation.user_one = 1
THEN
INNER JOIN `users`
ON conversation.two = users.id
WHEN conversation.user_two = 1
THEN
INNER JOIN `users`
ON conversation.user_one = users.id
END CASE
WHERE `user_one` = 1 OR `user_two` = 1
Don't case the entire inner join, do the case on only the 'on' clause in the join. This should work (unless I have typos):
SELECT
conversation.c_id,
conversation.user_one,
conversation.user_two,
users.name,
users.lastName
FROM `conversation`
INNER JOIN `users`
on
users.id =
CASE
WHEN conversation.user_one = 1
THEN conversation.two
WHEN conversation.user_two = 1
THEN conversation.user_one
END
WHERE `user_one` = 1 OR `user_two` = 1
You can also achieve a similiar affect by left joining on each of these conditions and then using the case statement in your select statement to determine which one of the two tables to display records from.