# 42. PL/pgSQL - SQL Procedural Language

- [42.1. Overview](/13/server-programming/pl-pgsql-sql-procedural-language/overview.md)
- [42.2. Structure of PL/pgSQL](/13/server-programming/pl-pgsql-sql-procedural-language/structure-of-pl-pgsql.md)
- [42.3. Declarations](/13/server-programming/pl-pgsql-sql-procedural-language/declarations.md)
- [42.4. Expressions](/13/server-programming/pl-pgsql-sql-procedural-language/expressions.md)
- [42.5. 基本語法](/13/server-programming/pl-pgsql-sql-procedural-language/basic-statements.md)
- [42.6. Control Structures](/13/server-programming/pl-pgsql-sql-procedural-language/control-structures.md)