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Other than that, I have a tab for clients, employees, suppliers and products (mostly all consist of ID, name, surname, phone number, address, with the exception of products which also has a stock and stock capacity columns) kept in stock). I already wrote 5 select functions to sort random entries in ascending order or according to some criteria, but I'm not sure what to do for the group by and sub-query requirements. Every time I try to make some sort of comparison or arrange based on criteria across multiple tables I'm assuming I get an error cause running the query results in a blank table. Did I fuck up? Should I start over?
