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云数据库 SelectDB 版通过集群粒度实现算力隔离，多个集群可以分别用于不同的工作负载（例如读写数据），以满足各个业务的不同性能规模和使用时长需求。本文介绍如何在云数据库 SelectDB 版实例中新建集群。

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云数据库 SelectDB 版兼容标准的SQL语法。您可以通过标准的SQL语句访问云数据库 SelectDB 版，同时云数据库 SelectDB 版提供了丰富的数据类型和内置函数。SQL语法，请参见SelectDB SQL手册。云数据库 SelectDB 版通过标准的SQL语句访问云数据库 Sele...

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文章 2018-10-02 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 12 章全文搜索_12.8. 测试和调试文本搜索

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文章 2018-10-02 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 12 章全文搜索_12.3. 空值文本搜索

12.3. 空值文本搜索 12.3.1. 解析文档 12.3.2. 解析查询 12.3.3. 排名搜索结果 12.3.4. 加亮结果要实现全文搜索必须要有一个从文档创建tsvector以及从用户查询创建tsquery的函数。而且我们需要一种有用的顺序返回结果，因此我们需要一个函数能够根据文档与查询的相关性比较文档。还有一点重要的是要能够很好地显示结果。PostgreSQL对所有这些函数...

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