Select * from 2 tables where CatergoryID's are 1 - mysql

Question

I've got these tables:
table : _newapp_shop_products_events
+-------+-----------+-----------+-------------------+
| EventID | categoryID | Price |
+-------+-----------+-----------+-------------------+
| 9050 | 1 | 15.00 |
| 5048 | 2 | 12.00 |
+-------+-----------+-----------+-------------------+
table : _newapp_shop_products_categories
+-------+-----------+-----------+-------------------+
| CategoryID | Category_Name | photo |
+-------+-----------+-----------+-------------------+
| 1 | Tickets | one.jpg |
| 2 | Voucher | two.jpg |
+-------+-----------+-----------+-------------------+
table : _newapp_shop_products_activitys
+-------+-----------+-----------+-------------------+
| ActivityID | categoryID | Price |
+-------+-----------+-----------+-------------------+
| 80 | 1 | 13.00 |
| 95 | 2 | 18.00 |
+-------+-----------+-----------+-------------------+
And these are linked by a relationship, categories -> events, categories -> activities.
I want to display events and activities (the Events and Activity Tables not the _newapp ones) in one list and only display the items from both tables with categoryID = 1 for example. How would I solve this?
I have tried to join them or select them both in a union, it returns the rows fine but the internal link within mysql is broken. when I click on the second result set from 'Activitys' the id is correct and the price but when i click the id to go to the corresponding id it gives 0 rows result as it generates the query: SELECT * FROM representin_nl_-_1.Events WHERE Id = 5 But that is the wrong table, it should search it in SELECT * FROM representin_nl_-_1._newapp_shop_products_activitys WHERE Id = 5 instead. Result: The first 9050 when i click it, it goes to the correct row but the ids after that are not found. Result:

Answer 1

You probably want a UNION
SELECT 'Event' AS Type, EventID AS Id, Price
FROM Events
WHERE CategoryId = 1
UNION ALL
SELECT 'Activity' AS Type, ActivityID AS Id, Price
FROM Activity
WHERE CategoryId = 1
What do you mean Id conflict? You could do something like this instead
SELECT EventID, null AS ActivityId, Price
FROM Events
WHERE CategoryId = 1
UNION ALL
SELECT null, ActivityID, Price
FROM Activity
WHERE CategoryId = 1