SELECT A.*, B.*
FROM TABLEA A
INNER JOIN TABLEB B ON A.MSISDN = B.MSIDN
WHERE A.firstname != B.firstname
OR A.lastname != B.Lastname
SELECT A.*, B.*
FROM TABLEA A
INNER JOIN TABLEB B ON A.MSISDN = B.MSIDN
WHERE A.firstname != B.firstname
OR A.lastname != B.Lastname