Получение Списка Пользователей

SELECT
  CAST(U.SEC$USER_NAME AS CHAR(20)) AS LOGIN,
  CAST(A.SEC$KEY AS CHAR(10)) AS TAG,
  CAST(A.SEC$VALUE AS CHAR(20)) AS "VALUE",
  U.SEC$PLUGIN AS "PLUGIN"
FROM SEC$USERS U
  LEFT JOIN SEC$USER_ATTRIBUTES A
         ON U.SEC$USER_NAME = A.SEC$USER_NAME
        AND U.SEC$PLUGIN = A.SEC$PLUGIN;

   LOGIN                TAG        VALUE                PLUGIN
   ==================== ========== ==================== ==========================
   SYSDBA               <null>     <null>               Srp
   ALEX                 B          x                    Srp
   ALEX                 C          sample               Srp
   SYSDBA               <null>     <null>               Legacy_UserManager