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Deven
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47 lines
2.0 KiB
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<h2><a href="https://leetcode.com/problems/customer-placing-the-largest-number-of-orders/">586. Customer Placing the Largest Number of Orders</a></h2><h3>Easy</h3><hr><div class="sql-schema-wrapper__3VBi"><a class="sql-schema-link__3cEg">SQL Schema<svg viewBox="0 0 24 24" width="1em" height="1em" class="icon__1Md2"><path fill-rule="evenodd" d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></svg></a></div><div><p>Table: <code>Orders</code></p>
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<pre>+-----------------+----------+
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| Column Name | Type |
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+-----------------+----------+
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| order_number | int |
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| customer_number | int |
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+-----------------+----------+
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order_number is the primary key for this table.
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This table contains information about the order ID and the customer ID.
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</pre>
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<p> </p>
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<p>Write an SQL query to find the <code>customer_number</code> for the customer who has placed <strong>the largest number of orders</strong>.</p>
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<p>The test cases are generated so that <strong>exactly one customer</strong> will have placed more orders than any other customer.</p>
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<p>The query result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre><strong>Input:</strong>
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Orders table:
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+--------------+-----------------+
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| order_number | customer_number |
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+--------------+-----------------+
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| 1 | 1 |
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| 2 | 2 |
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| 3 | 3 |
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| 4 | 3 |
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+--------------+-----------------+
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<strong>Output:</strong>
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+-----------------+
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| customer_number |
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+-----------------+
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| 3 |
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+-----------------+
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<strong>Explanation:</strong>
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The customer with number 3 has two orders, which is greater than either customer 1 or 2 because each of them only has one order.
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So the result is customer_number 3.
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</pre>
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<p> </p>
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<p><strong>Follow up:</strong> What if more than one customer has the largest number of orders, can you find all the <code>customer_number</code> in this case?</p>
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</div> |