参考文档：https://help.aliyun.com/zh/analyticdb/analyticdb-for-postgresql/user-guide/fusion-search-use-guide?spm=a2c4g.11186623.help-menu-92664.d_2_8_3.4bf95fa2s3zEtw&scm=20140722.H_2528590._.OR_help-....

文章 2023-05-22 来自：开发者社区

《阿里云认证的解析与实战-数据仓库ACP认证》——云原生数据仓库AnalyticDB PostgreSQL版功能演示（上）——五、执行SQL查询

查询customer表的总行数。查询语句如下：SELECT count() FROM customer;

文章 2022-06-14 来自：开发者社区

Citus 分布式 PostgreSQL 集群 - SQL Reference(手动查询传播)

手动查询传播当用户发出查询时，Cituscoordinator 将其划分为更小的查询片段，其中每个查询片段可以在工作分片上独立运行。这允许 Citus 将每个查询分布在集群中。但是，将查询划分为片段的方式（以及传播哪些查询）因查询类型而异。在某些高级情况下，手动控制此行为很有用。 Citus 提供实用函数来将 SQL 传播到 workers、shards 或 placements。手动查询传播....

文章 2022-06-14 来自：开发者社区

Citus 分布式 PostgreSQL 集群 - SQL Reference(查询处理)

一个 Citus 集群由一个 coordinator 实例和多个 worker 实例组成。数据在 worker 上进行分片和复制，而 coordinator 存储有关这些分片的元数据。向集群发出的所有查询都通过 coordinator 执行。 coordinator 将查询划分为更小的查询片段，其中每个查询片段可以在分片上独立运行。然后协调器将查询片段分配给 worker，监督他们的执行，合并他....

文章 2022-06-14 来自：开发者社区

Citus 分布式 PostgreSQL 集群 - SQL Reference(查询分布式表 SQL)

如前几节所述，Citus 是一个扩展，它扩展了最新的 PostgreSQL 以进行分布式执行。这意味着您可以在 Citus 协调器上使用标准 PostgreSQL SELECT 查询进行查询。 Citus 将并行化涉及复杂选择、分组和排序以及 JOIN 的 SELECT 查询，以加快查询性能。在高层次上，Citus 将 SELECT 查询划分为更小的查询片段，将这些查询片段分配给 worker，....

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云数据库 RDS SQL Server 版

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