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I ❤️ Oracle APEX
Self-joins are used to compare rows within the same table, often for hierarchical data.
Example: Find Employees and Their Managers
SELECT
e.employee_id,
e.name AS employee_name,
m.name AS manager_name
FROM empLoyees e
LEFT JOIN employees m ON e.manager_id = m.employee_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