CALL
CALL — invoke a procedure
Synopsis
CALL name ( [ argument ] [, ...] )
Description
CALL executes a procedure.
If the procedure has any output parameters, then a result row will be returned, containing the values of those parameters.
Parameters
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 Calling Functions
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
QHB versions.)
Notes
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
Calling a Procedure.
Examples
CALL do_db_maintenance();
Compatibility
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.