手册SQL概述的相关内容

阿里云文档 2025-09-19

如何创建SelectDB集群

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。

阿里云文档 2025-08-18

SelectDB SQL手册

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...

阿里云文档 2024-09-10

HTTP API SQL接口开发手册

本文介绍时序引擎提供的基于HTTP协议的通用SQL接口的定义和用法。

阿里云文档 2022-12-07

什么是SQL手册公用表表达式及示例

AnalyticDB PostgreSQL版7.0版本增强了公用表表达式（Common Table Expression，简称CTE）功能，支持对CTE语句指定MATERIALIZED或NOT MATERIALIZED，可以更好地控制执行计划，能够有效提升SQL性能。

文章 2018-10-02 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 10 章类型转换_10.1. 概述

10.1. 概述 SQL是一种强类型语言。也就是说，每个数据项都有一个相关的数据类型，数据类型决定其行为和允许的用法。 PostgreSQL有一个可扩展的类型系统，该系统比其它SQL实现更具通用和灵活。因而，PostgreSQL中大多数类型转换行为是由通用规则来管理的，而不是ad hoc启发式规则。这种做法允许使用混合类型表达式，即便是其中包含用户定义的类型。 PostgreS...

文章 2018-10-01 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 7 章查询_7.1. 概述

7.1. 概述从数据库中检索数据的过程或命令叫做查询。在 SQL 里SELECT命令用于指定查询。 SELECT命令的一般语法是 [WITH with_queries] SELECT select_list FROM table_expression [sort_specification] 下面几个小节描述选择列表、表表达式和排序声明的细节。WITH查询等高级特性将在最后讨...

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