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<!doctype html>
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2017-04-26
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<ul>
<li><strong>最重要的过滤语句</strong><ul>
<li><code>term</code>主要用于精确匹配哪些值，比如数字，日期，布尔值或 <code>not_analyzed</code>的字符串<strong>(未经分析的文本数据类型)</strong></li>
<li><code>terms</code> 跟 <code>term</code> 有点类似，但 <code>terms</code> 允许指定多个匹配条件。 如果某个字段指定了多个值，那么文档需要一起去做匹配</li>
<li><code>range</code>过滤允许我们按照指定范围查找一批数据</li>
<li><code>exists</code> 和 <code>missing</code> 过滤可以用于查找文档中是否包含指定字段或没有某个字段，类似于SQL语句中的IS_NULL条件</li>
<li><code>bool</code> 过滤可以用来合并多个过滤条件查询结果的布尔逻辑，它包含一下操作符<ul>
<li><code>must</code> :: 多个查询条件的完全匹配,相当于 <code>and</code>。</li>
<li><code>must_not</code> :: 多个查询条件的相反匹配，相当于 <code>not</code>。</li>
<li><code>should</code> :: 至少有一个查询条件匹配, 相当于 <code>or</code>。</li>
</ul>
</li>
</ul>
</li>
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<ul>
<li><strong>最重要的查询语句</strong><ul>
<li>使用<code>match_all</code> 可以查询到所有文档，是没有查询条件下的默认语句。</li>
<li><code>match</code>查询是一个标准查询，不管你需要全文本查询还是精确查询基本上都要用到它。</li>
<li><code>multi_match</code>查询允许你做<code>match</code>查询的基础上同时搜索多个字段</li>
<li><code>bool</code> 查询与 <code>bool</code> 过滤相似，用于合并多个查询子句。不同的是，<code>bool</code> 过滤可以直接给出是否匹配成功， 而<code>bool</code> 查询要计算每一个查询子句的 <code>_score</code> （相关性分值）<ul>
<li><code>must</code>:: 查询指定文档一定要被包含。</li>
<li><code>must_not</code>:: 查询指定文档一定不要被包含。</li>
<li><code>should</code>:: 查询指定文档，有则可以为文档相关性加分。</li>
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