# Chapter 44. PL/Tcl — Tcl Procedural Language
Table of Contents
44.2. PL/Tcl Functions and Arguments
44.5. Database Access from PL/Tcl
44.6. Trigger Functions in PL/Tcl
44.7. Event Trigger Functions in PL/Tcl
44.8. Error Handling in PL/Tcl
44.9. Explicit Subtransactions in PL/Tcl
PL/Tcl is a loadable procedural language for the PostgreSQL database system that enables the Tcl language (opens new window) to be used to write PostgreSQL functions and procedures.