How to get records that match value or exist in another table?

Question

I am trying to figure out how to get all tasks in this case that two of the fields equal a certain value or they exist in the other table?

Here is the query:

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Answer 1

Have you tried using a join?

SELECT TASKS.task_id, 
       TASKS.task_title, 
       TASKS.task_description, 
       TASKS.task_assigned_name, 
       TASKS.task_assigned_phone_number, 
       TASKS.task_due_date_time, 
       TASKS.task_category
FROM TASKS
JOIN WATCHERS on WATCHERS.task_id = TASK.task_id
WHERE TASKS.task_complete = 1 AND 
  (TASKS.task_creator_id = ? OR 
   TASKS.task_assigned_user_id = ? OR
   WATCHERS.watcher_user_id = ?);

I'm not sure if that's the logic you are looking for.

besides the extra where in your query, looks like you may have an extra closed parenthesis.

Answer 2

You seem to have an error in your syntax. You have too many WHEREs:

   SELECT t.task_id, t.task_title, t.task_description, t.task_assigned_name, t.task_assigned_phone_number, t.task_due_date_time, t.task_category
    FROM TASKS t
    WHERE t.task_complete = 1 AND 
          (t.task_creator_id = ? OR 
           t.task_assigned_user_id = ? OR
           EXISTS (SELECT 1  -- the return value is immaterial
                   FROM WATCHERS w
                   WHERE w.task_id = t.task_id AND
                         w.watcher_user_id = ?
                  )
         );

The WHERE before EXISTS is not appropriate.

Your query should be returning an error. Be sure to check for errors!

Answer 3

This sql matches the result set you posted in your duplicate post that has sample data and result:

SELECT t.task_id, t.task_complete, t.task_creator_id, t.task_assigned_user_Id
FROM tasks t
WHERE t.task_complete = 1 AND
      (
      t.task_creator_id = 8
      OR t.task_assigned_user_id = 8
      OR EXISTS
          (
          SELECT w.task_id
          FROM watchers w
          WHERE w.task_id = t.task_id
          AND w.watcher_user_id = 8
          )
      )