Два вопроса на случай.

Question

Возможно ли использовать регистр для выбора ч/б двух типов запросов? Я хочу выбрать любой из них. А также я хочу, чтобы столбцы обоих запросов были видны.

(CASE WHEN mti.category_code = 'SUBS' 
    THEN (SELECT u.circle_code, u.city, 
     u.msisdn AS subs_msisdn, 
     u.user_name || '' || u.last_name AS subs_name 
     FROM mtx_party u 
     WHERE msisdn LIKE :msisdn 
     AND u.user_id = mti.party_id) 
    ELSE (SELECT u1.circle_code, u1.city, 
      u1.msisdn AS ret_msisdn, 
      u1.user_name || '' || u1.last_name AS ret_name, 
          u2.user_name || '' || u2.last_name AS dist_name, 
          u2.msisdn AS dist_msisdn, ' ' AS dist_acc_no, 
          u1.agent_code 
         FROM users u1, users u2 
         WHERE msisdn LIKE :msisdn 
         AND u1.user_id = mti.party_id 
         AND u2.user_id = u1.parent_id) 
      END 

Answer 1

Вы можете использовать союз вместо

SELECT u.circle_code, u.city, 
     u.msisdn AS subs_msisdn, 
     u.user_name || '' || u.last_name AS subs_name 
     FROM mtx_party u 
     WHERE msisdn LIKE :msisdn 
     AND u.user_id = mti.party_id 
     /*STATEMENT THAT EXCLUDES THIS RESULTS FROM THIS QUERY*/ 
     AND mti.category_code = 'SUBS' 
union 
SELECT u1.circle_code, u1.city, 
      u1.msisdn AS ret_msisdn, 
      u1.user_name || '' || u1.last_name AS ret_name, 
      u2.user_name || '' || u2.last_name AS dist_name, 
      u2.msisdn AS dist_msisdn, ' ' AS dist_acc_no, 
      u1.agent_code 
FROM users u1, users u2 
WHERE msisdn LIKE :msisdn 
AND u1.user_id = mti.party_id 
AND u2.user_id = u1.parent_id 
/*STATEMENT THAT EXLUDES RESULTS FROM THIS QUERY*/ 
AND mti.category_code <> 'SUBS' 

Или вы можете сделать следующее

select mti.*, 
    CASE WHEN mti.category_code = 'SUBS' 
    THEN sub1.circle_code 
    ELSE sub2.circle_code 
    END as circle_code, 
    CASE WHEN mti.category_code = 'SUBS' 
    THEN sub1.city 
    ELSE sub2.city 
    END as city, 
    CASE WHEN mti.category_code = 'SUBS' 
    THEN sub1.subs_msisdn 
    ELSE sub2.ret_msisdn 
    END as msisdn, 
    etc...... 
from table mti 
left outer join (
SELECT u.user_id, u.circle_code, u.city, 
     u.msisdn AS subs_msisdn, 
     u.user_name || '' || u.last_name AS subs_name 
     FROM mtx_party u 
     WHERE msisdn LIKE :msisdn 
     /*STATEMENT THAT EXCLUDES THIS RESULTS FROM THIS QUERY*/ 
     AND mti.category_code = 'SUBS' 
) sub1 on sub1.user_id = mti.party_id 
left outer join (
SELECT u1.user_id, u1.circle_code, u1.city, 
      u1.msisdn AS ret_msisdn, 
      u1.user_name || '' || u1.last_name AS ret_name, 
      u2.user_name || '' || u2.last_name AS dist_name, 
      u2.msisdn AS dist_msisdn, ' ' AS dist_acc_no, 
      u1.agent_code 
FROM users u1, users u2 
WHERE msisdn LIKE :msisdn 
AND u2.user_id = u1.parent_id 
/*STATEMENT THAT EXLUDES RESULTS FROM THIS QUERY*/ 
AND mti.category_code <> 'SUBS' 
) sub2 on sub2.user_id = mti.party_id