PostgreSQL SQL/PGQ

Protocols PostgreSQL wire

SQL/PGQ (GRAPH_TABLE) is core PostgreSQL SQL syntax executed like any other query over the standard Postgres wire protocol; no separate transport.

• The graph query part happens inside the GRAPH_TABLE construct. As far as the rest of the query is concerned, this acts like a table function in that it produces a computed table as output.

  PostgreSQL: Documentation: devel: 7.9. Graph Queries · reviewed 2026-08-02

License PostgreSQL

Confirms current value. SQL/PGQ is a built-in feature of core PostgreSQL, so it carries the same PostgreSQL License as the rest of the project.

• PostgreSQL is released under the PostgreSQL License, a liberal Open Source license, similar to the BSD or MIT licenses.

  PostgreSQL: License · reviewed 2026-08-02

Released 2026-03

Date the SQL/PGQ patch was committed to PostgreSQL master, not a stable release: the feature is absent from the PostgreSQL 18 release notes and CREATE PROPERTY GRAPH has no page in the current documentation, so it ships in a future major version.

• Subject: pgsql: SQL Property Graph Queries (SQL/PGQ) Date: 2026-03-16

  pgsql-committers: SQL Property Graph Queries (SQL/PGQ) · reviewed 2026-08-02

Language C

Confirms current value.

• Although the PostgreSQL backend is written in C, it is possible to write extensions in C++ if these guidelines are followed:

  PostgreSQL: Documentation: 16: 38.10. C-Language Functions · reviewed 2026-08-02