CALL - invoke a procedure

CALL conforms to the SQL standard, except for the handling of output parameters. The standard says that
       users should write variables to receive the values of output parameters.

CALL executes a procedure.

       If the procedure has any output parameters, then a result row will be returned, containing the values of
       those parameters.

           CALL do_db_maintenance();

       CALL - invoke a procedure

       The user must have EXECUTE privilege on the procedure in order to be allowed to invoke it.

       To call a function (not a procedure), use SELECT instead.

       If CALL is executed in a transaction block, then the called procedure cannot execute transaction control
       statements. Transaction control statements are only allowed if CALL is executed in its own transaction.

       PL/pgSQL handles output parameters in CALL commands differently; see Section 41.6.3.

name
           The name (optionally schema-qualified) of the procedure.

       argument
           An argument expression for the procedure call.

           Arguments can include parameter names, using the syntax name => value. This works the same as in
           ordinary function calls; see Section 4.3 for details.

           Arguments must be supplied for all procedure parameters that lack defaults, including OUT parameters.
           However, arguments matching OUT parameters are not evaluated, so it's customary to just write NULL
           for them. (Writing something else for an OUT parameter might cause compatibility problems with future
           PostgreSQL versions.)

       CREATE PROCEDURE (CREATE_PROCEDURE(7))

PostgreSQL 17.5                                       2025                                               CALL(7)

       CALL name ( [ argument ] [, ...] )