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PostgreSQL : Lister toutes les fonctions

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requête :

SELECT routines.routine_name, parameters.data_type, parameters.ordinal_position
FROM information_schema.routines
     LEFT JOIN information_schema.parameters ON routines.specific_name=parameters.specific_name
WHERE routines.specific_schema= 'nom_du_schema'
ORDER BY routines.routine_name, parameters.ordinal_position;

example : 
SELECT routines.routine_name, parameters.data_type, parameters.ordinal_position
FROM information_schema.routines
    LEFT JOIN information_schema.parameters ON routines.specific_name=parameters.specific_name
WHERE routines.specific_schema= 'public'
ORDER BY routines.routine_name, parameters.ordinal_position;