I wrote a query (with lots of help, see my painfully plentiful other threads) using a correlated subquery and it takes 5.78 seconds PER RECORD to return results. The SAME query, only I select the ...

Last time, we learned about 'subqueries,' where you use the results of another search directly as a condition. This time, I will introduce its advanced version: the 'correlated subquery'. It becomes a ...

The goal of this project is to strengthen query-writing skills and apply them to real-world HR and business scenarios. Employees whose salary is greater than the average salary of the IT department.