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Answer Posted / hr@tgksolutions.com
• Use DISTINCT in queries to filter duplicates.
• Use ROW_NUMBER() to identify duplicates:
DELETE FROM Employees
WHERE id NOT IN (
SELECT MIN(id)
FROM Employees
GROUP BY name, email
);
• Implement unique constraints on key fields.
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11. Display the client number and name and the client number and name of the person who referred that client.
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