Question

Can we classify/say that TRUNCATE belongs to/falls under DML statement?

Check here for PostgreSQL TRUNCATE compatibility.

NOTE: TRUNCATE is part of SQL standard ANSI SQL 2008 – F200

Answer 1

PostgreSQL

I would say it’s a DML statement in PostgreSQL: PostgreSQL has a TRUNCATE trigger but PostgreSQL doesn’t have DDL triggers. So it can’t be a DDL statement.

It acquires an ACCESS EXCLUSIVE lock on each table it operates on and it’s not MVCC-safe but it’s transactionsafe and you can do a rollback.

The ability to fire triggers for
TRUNCATE is a PostgreSQL extension of
the SQL standard.