CALL — invoke a procedure
CALLname( [argument] [, ...] )
CALL executes a procedure.
If the procedure has any output parameters, then a result row will be returned, containing the values of those parameters.
nameThe name (optionally schema-qualified) of the procedure.
argumentAn argument expression for the procedure call.
Arguments can include parameter names, using the syntax name => value
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.)
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 43.6.3.
CALL do_db_maintenance();
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.
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