Junte 2 tabelas e exiba por id, prioridade e número

SELECT *
FROM   (
  SELECT client_id, priority, phone_number, phone_type
  FROM   client_table c
         LEFT OUTER JOIN
         phone_table p
         ON ( c.phone_id = p.phone_id )
)
PIVOT ( MAX( phone_type ) AS phonetype, MAX( phone_number ) AS phonenumber
        FOR priority IN ( 1 AS Prio1, 2 AS Prio2, 3 AS Prio3 ) );

 CLIENT_ID PRIO1_PHONETYPE PRIO1_PHONENUMBER PRIO2_PHONETYPE PRIO2_PHONENUMBER PRIO3_PHONETYPE PRIO3_PHONENUMBER
---------- --------------- ----------------- --------------- ----------------- --------------- -----------------
         1 C               9999999999        H               5555555555        W               7777777777