https://jens.dev/tags/timestamps.html Recent content in Timestamps on My personal blog Hugo en-us Fri, 03 Oct 2008 12:13:15 +0000 https://jens.dev/2008/10/03/generate-random-timestamps-in-mysql.html Fri, 03 Oct 2008 12:13:15 +0000 https://jens.dev/2008/10/03/generate-random-timestamps-in-mysql.html <p>I’m now try to prepare a mysql performance comparison between hdd and flash. So to create a lot of test data I needed a function to create random timestamps in a certain range.</p> <p>After trying google I gave up and started with the mysql documentation and came up with the following statement:</p> <div class="highlight"><pre tabindex="0" style="color:#272822;background-color:#fafafa;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-sql" data-lang="sql"><span style="display:flex;"><span><span style="color:#00a8c8">select</span> <span style="color:#111">from_unixtime</span><span style="color:#111">(</span> </span></span><span style="display:flex;"><span> <span style="color:#111">unix_timestamp</span><span style="color:#111">(</span><span style="color:#d88200">&#39;2008-01-01 01:00:00&#39;</span><span style="color:#111">)</span><span style="color:#f92672">+</span><span style="color:#111">floor</span><span style="color:#111">(</span><span style="color:#111">rand</span><span style="color:#111">()</span><span style="color:#f92672">*</span><span style="color:#ae81ff">31536000</span><span style="color:#111">)</span> </span></span><span style="display:flex;"><span><span style="color:#111">);</span> </span></span></code></pre></div><p>So lets break it it down a bit:</p> <p>first I set a start date (minimum for the random)</p>