PostgreSQL 9.5.0 Documentation
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Chapter 35. 扩展 SQL

Table of Contents
35.1. 扩展性如何工作
35.2. PostgreSQL类型系统
35.2.1. 基础类型
35.2.2. 组合类型
35.2.3. 域
35.2.4. 伪类型
35.2.5. 多态类型
35.3. User-defined Functions
35.4. Query Language (SQL) Functions
35.4.1. Arguments for SQL Functions
35.4.2. SQL Functions on Base Types
35.4.3. SQL Functions on Composite Types
35.4.4. SQL Functions with Output Parameters
35.4.5. SQL Functions with Variable Numbers of Arguments
35.4.6. SQL Functions with Default Values for Arguments
35.4.7. SQL Functions as Table Sources
35.4.8. SQL Functions Returning Sets
35.4.9. SQL Functions Returning TABLE
35.4.10. Polymorphic SQL Functions
35.4.11. SQL Functions with Collations
35.5. Function Overloading
35.6. Function Volatility Categories
35.7. Procedural Language Functions
35.8. Internal Functions
35.9. C-Language Functions
35.9.1. Dynamic Loading
35.9.2. Base Types in C-Language Functions
35.9.3. Version 0 Calling Conventions
35.9.4. Version 1 Calling Conventions
35.9.5. Writing Code
35.9.6. Compiling and Linking Dynamically-loaded Functions
35.9.7. Composite-type Arguments
35.9.8. Returning Rows (Composite Types)
35.9.9. Returning Sets
35.9.10. Polymorphic Arguments and Return Types
35.9.11. Transform Functions
35.9.12. Shared Memory and LWLocks
35.9.13. Using C++ for Extensibility
35.10. User-defined Aggregates
35.10.1. Moving-Aggregate Mode
35.10.2. Polymorphic and Variadic Aggregates
35.10.3. Ordered-Set Aggregates
35.10.4. Support Functions for Aggregates
35.11. User-defined Types
35.12. 用户定义的操作符
35.13. 操作符优化信息
35.13.1. COMMUTATOR
35.13.2. NEGATOR
35.13.3. RESTRICT
35.13.4. JOIN
35.13.5. HASHES
35.13.6. MERGES
35.14. Interfacing Extensions To Indexes
35.14.1. Index Methods and Operator Classes
35.14.2. Index Method Strategies
35.14.3. Index Method Support Routines
35.14.4. An Example
35.14.5. Operator Classes and Operator Families
35.14.6. System Dependencies on Operator Classes
35.14.7. Ordering Operators
35.14.8. Special Features of Operator Classes
35.15. 打包相关对象到一个扩展中
35.15.1. 扩展文件
35.15.2. 扩展可再定位性
35.15.3. 扩展配置表
35.15.4. 扩展更新
35.15.5. 扩展实例
35.16. 扩展的构建基础设施

在下面的小节中，我们将讨论如何通过增加各种元素来扩展PostgreSQL SQL 查询语言：

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