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SELECT customer_name, CASE WHEN total_purchases > 1000 THEN 'Gold' WHEN total_purchases > 500 THEN 'Silver' ELSE 'Bronze' END AS membership_tier FROM customers;

The curriculum is structured to guide you through the entire lifecycle of data management—from installation to advanced analytics.

SELECT department, COUNT(*) FROM employees GROUP BY department HAVING COUNT(*) > 5;

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How long does the OET Test take?