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When to Use
I ❤️ Oracle APEX
Use subqueries when you need to pass the result of one query as input to another, often for filtering or comparisons.
Example: Find Employees Who Earn More Than Their Departments Average
SELECT employee_id, name, salary
FROM employees e
WHERE salary > (
SELECT AVG(salary)
FROM employees e
WHERE department_id = e.department_id);
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declare l_csv clob; l_line varchar2(4000); begin -- Add headers (Replace with your actual column names) l_line := '"COLUMN1","COLUMN2"'; l_csv := l_line || chr(10); -- Loop through data (Replace with your table or query) for rec in ( select COL...
When to Use
Aggregate Functions (Used for calculations over a set of rows) SUM(): Calculates the sum of values over a window. AVG(): Calculates the average of values. MIN(): Finds the minimum value. MAX(): Finds the maximum value. COUNT(): Counts rows over ...
When to Use