https://it-grossniklaus.ch/tags/explain/ Recent content in EXPLAIN on it-grossniklaus.ch Hugo de https://it-grossniklaus.ch/pages/topics/data/dbms/snippets/mysql/explain/ Mon, 01 Jan 0001 00:00:00 +0000 https://it-grossniklaus.ch/pages/topics/data/dbms/snippets/mysql/explain/ <h2 id="explain">Explain</h2> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-SQL" data-lang="SQL"><span class="line"><span class="cl"><span class="n">USE</span><span class="w"> </span><span class="n">db_name</span><span class="p">;</span><span class="w"> </span></span></span><span class="line"><span class="cl"><span class="w"> </span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="k">EXPLAIN</span><span class="w"> </span><span class="k">select</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="n">tbl_name</span><span class="w"> </span><span class="k">where</span><span class="w"> </span><span class="p">...</span><span class="w"> </span><span class="k">like</span><span class="w"> </span><span class="s1">&#39;%&#39;</span><span class="p">;</span><span class="w"> </span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="k">EXPLAIN</span><span class="w"> </span><span class="n">EXTENDED</span><span class="w"> </span><span class="k">select</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">from</span><span class="w"> </span><span class="n">tbl_name</span><span class="w"> </span><span class="k">where</span><span class="w"> </span><span class="p">...</span><span class="w"> </span><span class="k">like</span><span class="w"> </span><span class="s1">&#39;%&#39;</span><span class="p">;</span><span class="w"> </span></span></span></code></pre></div><div class="highlight"><pre tabindex="0" class="chroma"><code class="language-SQL" data-lang="SQL"><span class="line"><span class="cl"><span class="c1">-- dazu dann oft auch </span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="k">SHOW</span><span class="w"> </span><span class="k">INDEX</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">tbl_name</span><span class="p">;</span><span class="w"> </span></span></span></code></pre></div>