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71 lines
2.2 KiB
HTML
71 lines
2.2 KiB
HTML
<p>Table: <code> logs</code></p>
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<pre>
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+-------------+---------+
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| Column Name | Type |
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+-------------+---------+
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| log_id | int |
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| ip | varchar |
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| status_code | int |
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+-------------+---------+
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log_id is the unique key for this table.
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Each row contains server access log information including IP address and HTTP status code.
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</pre>
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<p>Write a solution to find <strong>invalid IP addresses</strong>. An IPv4 address is invalid if it meets any of these conditions:</p>
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<ul>
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<li>Contains numbers <strong>greater than</strong> <code>255</code> in any octet</li>
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<li>Has <strong>leading zeros</strong> in any octet (like <code>01.02.03.04</code>)</li>
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<li>Has <strong>less or more</strong> than <code>4</code> octets</li>
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</ul>
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<p>Return <em>the result table </em><em>ordered by</em> <code>invalid_count</code>, <code>ip</code> <em>in <strong>descending</strong> order respectively</em>. </p>
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<p>The result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong></p>
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<p>logs table:</p>
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<pre class="example-io">
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+--------+---------------+-------------+
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| log_id | ip | status_code |
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+--------+---------------+-------------+
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| 1 | 192.168.1.1 | 200 |
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| 2 | 256.1.2.3 | 404 |
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| 3 | 192.168.001.1 | 200 |
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| 4 | 192.168.1.1 | 200 |
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| 5 | 192.168.1 | 500 |
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| 6 | 256.1.2.3 | 404 |
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| 7 | 192.168.001.1 | 200 |
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+--------+---------------+-------------+
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</pre>
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<p><strong>Output:</strong></p>
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<pre class="example-io">
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+---------------+--------------+
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| ip | invalid_count|
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+---------------+--------------+
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| 256.1.2.3 | 2 |
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| 192.168.001.1 | 2 |
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| 192.168.1 | 1 |
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+---------------+--------------+
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</pre>
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<p><strong>Explanation:</strong></p>
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<ul>
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<li>256.1.2.3 is invalid because 256 > 255</li>
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<li>192.168.001.1 is invalid because of leading zeros</li>
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<li>192.168.1 is invalid because it has only 3 octets</li>
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</ul>
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<p>The output table is ordered by invalid_count, ip in descending order respectively.</p>
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</div>
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