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Oracle SQL Aggregate Functions Full Tutorial | COUNT, SUM, AVG, MAX, MIN + GROUP BY | Packiyaraj Raja

Oracle SQL Aggregate Functions Full Tutorial | COUNT, SUM, AVG, MAX, MIN + GROUP BY | Packiyaraj Raja

🚨 90% of SQL Developers Make This GROUP BY Mistake Many developers use Aggregate Functions every day. But a small mistake in GROUP BY can completely break the query. Example 👇 SELECT deptno, SUM(sal) FROM emp; This query will fail with: ⚠️ ORA-00979: not a GROUP BY expression Why? Because every non-aggregate column in the SELECT ...

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