Oracle DBA Script : Find Child table for given parent table

set echo off
set verify off
accept xTable prompt 'Enter Table Name: '
TTITLE LEFT 'Child Tables for the table: '&xTABLE
break on TABLE_NAME
SELECT B.TABLE_NAME, C.COLUMN_NAME,
C.POSITION
FROM USER_CONSTRAINTS A,
USER_CONSTRAINTS B,
USER_CONS_COLUMNS C
WHERE
A.CONSTRAINT_NAME=
B.R_CONSTRAINT_NAME
AND
A.TABLE_NAME = C.TABLE_NAME
AND
A.CONSTRAINT_NAME = C.CONSTRAINT_NAME
AND
A.TABLE_NAME = UPPER('&xTable')
ORDER BY B.TABLE_NAME, C.POSITION;

TTITLE LEFT 'Parent tables for the table: '&xTable

SELECT A.TABLE_NAME, C.COLUMN_NAME,
C.POSITION
FROM USER_CONSTRAINTS A,
USER_CONSTRAINTS B,
USER_CONS_COLUMNS C
WHERE
A.CONSTRAINT_NAME=B.R_CONSTRAINT_NAME
AND
B.TABLE_NAME = C.TABLE_NAME
AND
B.CONSTRAINT_NAME = C.CONSTRAINT_NAME
AND
B.TABLE_NAME = UPPER('&xTable')
ORDER BY A.TABLE_NAME, C.POSITION;