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| Aggregates |
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| Using GROUP BY |
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| Using HAVING |
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| Aggregates and NULL values |
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| GROUP BY with two columns |
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| JOINING TABLES |
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| Creation of company tables |
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| Insertion into company tables |
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| Finding a customer name using two queries |
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| Finding an order number for a customer name |
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| Three-table join |
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| Four-table join |
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| Employees who have taken orders for customers |
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| Joining customer and employee |
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| Joining customer and employee |
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