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Li"><meta itemprop="description" content="天下事有难易乎？为之，则难者亦易矣, 天生我材必有用"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="涛声依旧"></span><div class="body md" itemprop="articleBody"><h4 id="问题"><a class="anchor" href="#问题">#</a> 问题</h4><p>业务要求：查询所有省份：<br><img data-src="https://nas.hitoli.com:18014/images/2023/05/25/778f34f5670d.png" alt=""></p><h4 id="方法"><a class="anchor" href="#方法">#</a> 方法</h4><ol><li><p>distinct 排除重复<br></p><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">SELECT</span></span><br><span class="line"> <span class="keyword">DISTINCT</span>(province_code),</span><br><span class="line"> province_name</span><br><span class="line"><span class="keyword">FROM</span></span><br><span class="line"> t_mip_base_area</span><br></pre></td></tr></table></figure><p></p></li><li><p>group by 根据身份编码分组<br></p><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">SELECT</span> </span><br><span class="line"> province_code,</span><br><span class="line"> any_value(province_name)</span><br><span class="line"><span class="keyword">FROM</span> t_mip_base_area</span><br><span class="line"><span class="keyword">GROUP</span> <span class="keyword">BY</span> province_code</span><br></pre></td></tr></table></figure><p></p></li></ol><h6 id="若这样写"><a class="anchor" href="#若这样写">#</a> 若这样写</h6><p></p><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">SELECT</span> </span><br><span class="line"> province_code,</span><br><span class="line"> province_name</span><br><span class="line"><span class="keyword">FROM</span> t_mip_base_area</span><br><span class="line"><span class="keyword">GROUP</span> <span class="keyword">BY</span> province_code</span><br></pre></td></tr></table></figure><br>则会报错<br><img data-src="https://nas.hitoli.com:18014/images/2023/05/25/c57a8e811928.png" alt=""><p></p><h4 id="总结"><a class="anchor" href="#总结">#</a> 总结：</h4><ol><li><p>MySQL5.7 之后，sql_mode 中 ONLY_FULL_GROUP_BY 模式默认设置为打开状态。</p></li><li><p>ONLY_FULL_GROUP_BY 的语义就是确定 select target list 中的所有列的值都是明确语义，简单的说来，在此模式下，target list 中的值要么是来自于聚合函数（sum、avg、max 等）的结果，要么是来自于 group by list 中的表达式的值</p></li><li><p>MySQL 提供了 any_value () 函数来抑制 ONLY_FULL_GROUP_BY 值被拒绝</p></li><li><p>any_value () 会选择被分到同一组的数据里第一条数据的指定列值作为返回数据</p></li></ol><div class="tags"><a href="/tags/mysql/" rel="tag"><i class="ic i-tag"></i> mysql</a></div></div><footer><div class="meta"><span class="item"><span class="icon"><i class="ic i-calendar-check"></i> </span><span class="text">更新于</span> <time title="修改时间：2023-05-25 18:22:49" itemprop="dateModified" datetime="2023-05-25T18:22:49+08:00">2023-05-25</time> </span><span id="2023/05/25/MySQL中的any-value-函数/" class="item leancloud_visitors" data-flag-title="MySQL 中的 any_value () 函数" title="阅读次数"><span class="icon"><i class="ic i-eye"></i> </span><span class="text">阅读次数</span> <span class="leancloud-visitors-count"></span> <span class="text">次</span></span></div><div class="reward"><button><i class="ic i-heartbeat"></i> 赞赏</button><p>请我喝[茶]~(￣▽￣)~*</p><div id="qr"><div><img data-src="/images/wechatpay.png" alt="Hito Li 微信支付"><p>微信支付</p></div><div><img data-src="/images/alipay.png" alt="Hito Li 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