https://blog.grabbyte.com/tags/%E5%87%BD%E6%95%B0/ Recent content in 函数 on 软件开发大郭的技术博客 Hugo en Tue, 29 Nov 2022 15:59:00 +0800 https://blog.grabbyte.com/p/2022/11/29.html Tue, 29 Nov 2022 15:59:00 +0800 https://blog.grabbyte.com/p/2022/11/29.html <p>获取当月第一天：</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-sql" data-lang="sql"><span class="line"><span class="cl"><span class="n">DATE_ADD</span><span class="p">(</span><span class="n">curdate</span><span class="p">(),</span><span class="nb">interval</span><span class="w"> </span><span class="o">-</span><span class="k">day</span><span class="p">(</span><span class="n">curdate</span><span class="p">())</span><span class="o">+</span><span class="mi">1</span><span class="w"> </span><span class="k">day</span><span class="p">))</span><span class="w"> </span></span></span></code></pre></td></tr></table> </div> </div><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-sql" data-lang="sql"><span class="line"><span class="cl"><span class="n">ADDDATE</span><span class="p">(</span><span class="n">NOW</span><span class="p">(),</span><span class="w"> </span><span class="nb">INTERVAL</span><span class="w"> </span><span class="o">-#</span><span class="err">{</span><span class="k">start</span><span class="err">}</span><span class="w"> </span><span class="k">MONTH</span><span class="p">)</span><span class="w"> </span></span></span></code></pre></td></tr></table> </div> </div><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-sql" data-lang="sql"><span class="line"><span class="cl"><span class="o">%</span><span class="n">Y</span><span class="o">-%</span><span class="n">m</span><span class="o">-%</span><span class="n">d</span><span class="w"> </span><span class="o">%</span><span class="n">T</span><span class="w"> </span></span></span></code></pre></td></tr></table> </div> </div><p>Oracle:</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-sql" data-lang="sql"><span class="line"><span class="cl"><span class="p">(</span><span class="n">SYSDATE</span><span class="o">-</span><span class="w"> </span><span class="n">STR_TO_DATE</span><span class="p">(</span><span class="n">b</span><span class="p">.</span><span class="n">CREATE_TM</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;%Y-%m-%d %T&#39;</span><span class="p">))</span><span class="o">*</span><span class="mi">24</span><span class="o">*</span><span class="mi">60</span><span class="p">)</span><span class="w"> </span></span></span></code></pre></td></tr></table> </div> </div><p>转换为： MySQL:</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-sql" data-lang="sql"><span class="line"><span class="cl"><span class="p">(</span><span class="n">TO_DAYS</span><span class="p">(</span><span class="n">NOW</span><span class="p">())</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">TO_DAYS</span><span class="p">(</span><span class="n">STR_TO_DATE</span><span class="p">(</span><span class="s2">&#34;2022-11-26 11:11:11&#34;</span><span class="p">,</span><span class="s2">&#34;%Y-%m-%d %T&#34;</span><span class="p">)))</span><span class="o">*</span><span class="mi">24</span><span class="o">*</span><span class="mi">60</span><span class="w"> </span></span></span></code></pre></td></tr></table> </div> </div>