Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Order_Items (product_id VARCHAR, total_amount_purchased INTEGER)
TABLE: CREATE TABLE Product_Suppliers (product_id VARCHAR, total_amount_purchased INTEGER)

### Question ###
Return the ids of all products that were ordered more than three times or supplied more than 80000.

### Accurate SQL ###

SELECT product_id FROM Order_Items GROUP BY product_id HAVING COUNT(*) > 3 UNION SELECT product_id FROM Product_Suppliers GROUP BY product_id HAVING SUM(total_amount_purchased) > 80000