CALL(7) - f38

1CALL(7)                  PostgreSQL 15.4 Documentation                 CALL(7)
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NAME

6       CALL - invoke a procedure
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SYNOPSIS

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

12       CALL executes a procedure.
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14       If the procedure has any output parameters, then a result row will be
15       returned, containing the values of those parameters.
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PARAMETERS

18       name
19           The name (optionally schema-qualified) of the procedure.
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21       argument
22           An argument expression for the procedure call.
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24           Arguments can include parameter names, using the syntax name =>
25           value. This works the same as in ordinary function calls; see
26           Section 4.3 for details.
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28           Arguments must be supplied for all procedure parameters that lack
29           defaults, including OUT parameters. However, arguments matching OUT
30           parameters are not evaluated, so it's customary to just write NULL
31           for them. (Writing something else for an OUT parameter might cause
32           compatibility problems with future PostgreSQL versions.)
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NOTES

35       The user must have EXECUTE privilege on the procedure in order to be
36       allowed to invoke it.
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38       To call a function (not a procedure), use SELECT instead.
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40       If CALL is executed in a transaction block, then the called procedure
41       cannot execute transaction control statements. Transaction control
42       statements are only allowed if CALL is executed in its own transaction.
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44       PL/pgSQL handles output parameters in CALL commands differently; see
45       Section 43.6.3.
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EXAMPLES

48           CALL do_db_maintenance();
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COMPATIBILITY

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