Not quite sure what you are asking ... but this UNION's 3 tables together:
SELECT Table1.FIELD1, Table1.FIELD2, Table1.FIELD3
FROM Table1
UNION SELECT Table2.FIELD2, Table1.FIELD2, Table2.FIELD3
FROM Table2
UNION SELECT Table3.FIELD2, Table3.FIELD2, Table3.FIELD3
FROM Table3
mx