Reputation: 112
I'm trying to join a different table depended on the value of a "task_type" column
What is wrong with the syntax? Thanks.
SELECT t.*,s.task_name
CASE
WHEN t.task_type = 0 THEN
LEFT JOIN scheduler_tasks s ON s.scheduler_task_id = t.task_id
WHEN t.task_type = 1 THEN
LEFT JOIN invoice_tasks s ON s.uid = t.task_id
END
FROM task_timings t
WHERE t.account_id = ? AND t.start_date >= DATE(?) AND t.start_date <= DATE(?)
Upvotes: 1
Views: 3409
Reputation: 1271171
I believe you want this:
SELECT t.*,
COALESCE(s.task_name, i.task_name) as task_name
FROM task_timings t LEFT JOIN
scheduler_tasks s
ON s.scheduler_task_id = t.task_id AND
t.task_type = 0 LEFT JOIN
invoice_tasks i
ON i.uid = t.task_id AND t.task_type = 1
WHERE t.account_id = ? AND t.start_date >= DATE(?) AND
t.start_date <= DATE(?);
Upvotes: 2
Reputation: 2487
Can you try like this :
SELECT t.*,s.task_name FROM task_timings t
CASE
WHEN t.task_type = 0 THEN
LEFT JOIN scheduler_tasks s ON s.scheduler_task_id = t.task_id
WHEN t.task_type = 1 THEN
LEFT JOIN invoice_tasks s ON s.uid = t.task_id
END
WHERE t.account_id = ? AND t.start_date >= DATE(?) AND t.start_date <= DATE(?)
Upvotes: 0