DBMS: PostgreSql, but MySql is acceptable as well I have 4 tables, permissions id slug allowed 1 create true 2 edit true 3 delete true 4 edit false roles id slug 1 Admin 2 Manger 3 User model_permissions model_type model_id…
I want to execute 2nd query if first query return no result. I want to get those id age > 20. If no result, want to get number of id with age < 20. In table: id name gender age…
I would like to use a division query to have all the customers who bought all products. The template is the following : SELECT * FROM Customers AS A WHERE NOT EXISTS ( SELECT * FROM Products AS B WHERE…