postgresql SQL语言表达式的相关内容

阿里云文档 2025-04-22

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PolarDB PostgreSQL版提供慢SQL分析功能，能够查看慢日志趋势和统计信息，并且提供SQL建议和诊断分析。

阿里云文档 2025-04-22

什么是慢SQL,如何使用SQL分析功能

PolarDB PostgreSQL版（兼容Oracle）提供慢SQL分析功能，能够查看慢日志趋势和统计信息，并且提供SQL建议和诊断分析。

阿里云文档 2025-02-17

如何使用SQL模式匹配

云原生数据仓库 AnalyticDB PostgreSQL 版兼容PostgreSQL模式匹配。本文简单列举云原生数据仓库 AnalyticDB PostgreSQL 版兼容的模式匹配及用法示例。

阿里云文档 2024-06-27

DAS企业版恢复部分单元Polar PG实例的付费计量

由于部分单元PolarDB PostgreSQL版实例此前开通数据库自治服务企业版（DAS企业版），计费组件出现未部署情况，导致长期没有计费产生，DAS企业版将于2024年07月05日 08:00恢复此部分开通DAS企业版的付费计量。

文章 2018-10-02 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 11 章索引_11.7. 表达式索引

11.7. 表达式索引一个索引列并不一定是底层表的一个列，也可以是从表的一列或多列计算而来的一个函数或者标量表达式。这种特性对于根据计算结果快速获取表中内容是有用的。例如，一种进行大小写不敏感比较的常用方法是使用lower函数： SELECT * FROM test1 WHERE lower(col1) = 'value'; 这种查询可以利用一个建立在lower(col1)函数结果之...

文章 2018-10-02 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 9 章函数和操作符_9.22. 子查询表达式

9.22. 子查询表达式 9.22.1. EXISTS 9.22.2. IN 9.22.3. NOT IN 9.22.4. ANY/SOME 9.22.5. ALL 9.22.6. 单一行比较本节描述PostgreSQL中可用的SQL兼容的子查询表达式。所有本节中成文的表达式都返回布尔值（真/假）结果。 9.22.1. EXI...

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_7.8. WITH查询（公共表表达式）

7.8. WITH查询（公共表表达式） 7.8.1. WITH中的SELECT 7.8.2. WITH中的数据修改语句 WITH提供了一种方式来书写在一个大型查询中使用的辅助语句。这些语句通常被称为公共表表达式或CTE，它们可以被看成是定义只在一个查询中存在的临时表。在WITH子句中的每一个辅助语句可以是一个SELECT、INSERT、UPDATE或DELETE，并且...

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_7.2. 表表达式

7.2. 表表达式 7.2.1. FROM子句 7.2.2. WHERE子句 7.2.3. GROUP BY和HAVING子句 7.2.4. GROUPING SETS、CUBE和ROLLUP 7.2.5. 窗口函数处理表表达式计算一个表。该表表达式包含一个FROM子句，该子句后面可以根据需要选用WHERE、GROUP BY和HAVING子句。最...

文章 2018-10-01 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 4 章 SQL语法_4.2. 值表达式

4.2. 值表达式 4.2.1. 列引用 4.2.2. 位置参数 4.2.3. 下标 4.2.4. 域选择 4.2.5. 操作符调用 4.2.6. 函数调用 4.2.7. 聚合表达式 4.2.8. 窗口函数调用 4.2.9. 类型转换 4.2.10. 排序规则表达式 4.2.11. 标量子查询 4.2.12. 数组构造器 4.2.13. 行构造器 4.2.14. 表达式计算规则值表达式...

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