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<div class="nav-wrap"><nav class="sub post cap"><a class="active" href="/">近期发布</a><a href="/archives">归档</a></nav></div>

  <div class="post-list post"><a class="post-card post " href="/2023/10/03/sql%E4%BC%98%E5%8C%96/">
<article class="md-text"><div class="post-cover"><img class="lazy" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAABGdBTUEAALGPC/xhBQAAADhlWElmTU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAAAqACAAQAAAABAAAAAaADAAQAAAABAAAAAQAAAADa6r/EAAAAC0lEQVQIHWNgAAIAAAUAAY27m/MAAAAASUVORK5CYII=" data-src="https://pic.imgdb.cn/item/63bc16f2be43e0d30eb899d1.jpg"/></div><h2 class="post-title">站点美化</h2><div class="excerpt"><p>1.select *
	首先当查询sql时，*会增加sql查询解析的负担，当表字段量非常大，则每次查
*都会被重新解析字段对sql服务造成很大负担
	第二就会覆盖索引，在条件查询时，通过索引进行查询，只查询一次b+树，而当查询*时候，则会先查非聚簇索引的b+树在查聚簇b+树
2.小数据集驱动大数据集（使用in而不是exists）
	使用select id from goods wher...</p></div><div class="meta cap"><span class="cap" id="post-meta">发布于&nbsp;<time datetime="2023-10-03T07:44:16.398Z">2023-10-03</time></span></div></article>
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<article class="md-text"><h2 class="post-title">Hello World</h2><div class="excerpt"><p>Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub.
Qu...</p></div><div class="meta cap"><span class="cap" id="post-meta">发布于&nbsp;<time datetime="2023-09-19T14:32:18.442Z">2023-09-19</time></span></div></article>
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