https://dominik.suess.wtf/filetags/database/Recent content in database on dominik.suess.wtfHugoen-usMon, 17 Aug 2026 06:49:00 +0200https://dominik.suess.wtf/notes/20260713t155944/Mon, 13 Jul 2026 00:00:00 +0000https://dominik.suess.wtf/notes/20260713t155944/<div class="src src-sql"> <div class="highlight"><pre tabindex="0" style="color:#fff;background-color:#000;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-sql" data-lang="sql"><span style="display:flex;"><span><span style="color:#b6a0ff">CREATE</span> <span style="color:#b6a0ff">TABLE</span> <span style="color:#00d3d0">`</span>varchar_resize_test<span style="color:#00d3d0">`</span> ( </span></span><span style="display:flex;"><span> <span style="color:#00d3d0">`</span>id<span style="color:#00d3d0">`</span> <span style="color:#f78fe7">int</span>(<span style="color:#00bcff">11</span>) <span style="color:#b6a0ff">NOT</span> <span style="color:#b6a0ff">NULL</span> AUTO_INCREMENT, </span></span><span style="display:flex;"><span> <span style="color:#00d3d0">`</span>url<span style="color:#00d3d0">`</span> <span style="color:#f78fe7">varchar</span>(<span style="color:#00bcff">255</span>) <span style="color:#b6a0ff">COLLATE</span> utf8mb4_unicode_ci <span style="color:#b6a0ff">NOT</span> <span style="color:#b6a0ff">NULL</span>, </span></span><span style="display:flex;"><span> <span style="color:#b6a0ff">PRIMARY</span> <span style="color:#b6a0ff">KEY</span> (<span style="color:#00d3d0">`</span>id<span style="color:#00d3d0">`</span>) </span></span><span style="display:flex;"><span>) ENGINE<span style="color:#00d3d0">=</span>InnoDB <span style="color:#b6a0ff">DEFAULT</span> CHARSET<span style="color:#00d3d0">=</span>utf8mb4 <span style="color:#b6a0ff">COLLATE</span><span style="color:#00d3d0">=</span>utf8mb4_unicode_ci; </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#b6a0ff">INSERT</span> <span style="color:#b6a0ff">INTO</span> varchar_resize_test (id,url) <span style="color:#b6a0ff">VALUES</span> (<span style="color:#00bcff">1</span>,<span style="color:#79a8ff">&#34;http://example.com&#34;</span>); </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#b6a0ff">select</span> <span style="color:#00d3d0">*</span> <span style="color:#b6a0ff">from</span> information_schema.COLUMNS <span style="color:#b6a0ff">where</span> <span style="color:#b6a0ff">TABLE_NAME</span> <span style="color:#b6a0ff">in</span> (<span style="color:#79a8ff">&#39;varchar_resize_test&#39;</span>) <span style="color:#b6a0ff">and</span> <span style="color:#b6a0ff">COLUMN_NAME</span> <span style="color:#00d3d0">=</span> <span style="color:#79a8ff">&#39;url&#39;</span>; </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#b6a0ff">ALTER</span> <span style="color:#b6a0ff">TABLE</span> varchar_resize_test CHANGE <span style="color:#b6a0ff">COLUMN</span> url url <span style="color:#f78fe7">VARCHAR</span>(<span style="color:#00bcff">600</span>) <span style="color:#f78fe7">CHARACTER</span> <span style="color:#b6a0ff">SET</span> utf8mb4 <span style="color:#b6a0ff">COLLATE</span> utf8mb4_unicode_ci <span style="color:#b6a0ff">NOT</span> <span style="color:#b6a0ff">NULL</span>, ALGORITHM<span style="color:#00d3d0">=</span>INPLACE, <span style="color:#b6a0ff">LOCK</span><span style="color:#00d3d0">=</span><span style="color:#b6a0ff">NONE</span>;</span></span></code></pre></div> </div>