Can we make this query shorter....?

Question

hi there
Can any body help me in reducing the number of lines in this query ! I am using union to concat 3 queries. Select fields in every query are same and in where condition also most of the joins are same in every query. but in where clause only two conditions are different. Can we make this 3 queries into one becoze entire select statement fields are same and most of the where conditions are same !
Below is the query:
SELECT
au1.bu_id,
au1.first_nam,
au1.last_nam,
c.id,
c.first_nam_d,
c.last_nam_d,
c.birth_dte_d,
c.ssn_num_d,
se.id schd_event_id,
seu.dsc,
ssc.dsc,
sea.access_typ,
sea.ATTENDEE_TYP
FROM
CLIENT c,
APP_USER au1,
SCHD_STAT_CD ssc,
schd_event_url seu,
schd_evnt se,
SCHD_evnt_stat ses,
SCHD_EVNT_ATTENDEE sea,
CLIENT_APPT ca
WHERE
c.id = ca.client_id_k AND
au1.bu_id = se.APP_USER_BU_ID_PRIME_K AND
ssc.code = ses.SCHD_STAT_CD_CODE_K AND
seu.code = se.SCHD_EVNT_URL_CODE_K AND
se.id = ses.SCHD_EVNT_ID_K AND
se.id = sea.SCHD_EVNT_ID_K(+) AND
se.id = ca.SCHD_EVNT_ID_K AND
sea.ATTENDEE_TYP(+) = 'WORKER' AND
ses.create_ts = (select max(create_ts) FROM SCHD_evnt_stat ses1 WHERE ses1.SCHD_EVNT_ID_K = ses.SCHD_EVNT_ID_K)
UNION
SELECT
au1.bu_id,
au1.first_nam,
au1.last_nam,
c.id,
c.first_nam_d,
c.last_nam_d,
c.birth_dte_d,
c.ssn_num_d,
se.id schd_event_id,
seu.dsc,
ssc.dsc,
FROM
CLIENT c,
APP_USER au1,
SCHD_STAT_CD ssc,
schd_event_url seu,
schd_evnt se,
SCHD_evnt_stat ses,
SCHD_EVNT_ATTENDEE sea,
CLIENT_APPT ca
WHERE
c.id = ca.client_id_k AND
au1.bu_id = se.APP_USER_BU_ID_PRIME_K AND
ssc.code = ses.SCHD_STAT_CD_CODE_K AND
seu.code = se.SCHD_EVNT_URL_CODE_K AND
se.id = ses.SCHD_EVNT_ID_K AND
se.id = sea.SCHD_EVNT_ID_K AND
se.id = ca.SCHD_EVNT_ID_K AND
sea.ATTENDEE_TYP = 'ROLE' AND
ses.create_ts = (select max(create_ts) FROM SCHD_evnt_stat ses1 WHERE ses1.SCHD_EVNT_ID_K = ses.SCHD_EVNT_ID_K)
UNION
SELECT
au1.bu_id,
au1.first_nam,
au1.last_nam,
c.id,
c.first_nam_d,
c.last_nam_d,
c.birth_dte_d,
c.ssn_num_d,
se.id schd_event_id,
seu.dsc,
ssc.dsc,
sea.access_typ,
sea.ATTENDEE_TYP
FROM
CLIENT c,
APP_USER au1,
SCHD_STAT_CD ssc,
schd_event_url seu,
schd_evnt se,
SCHD_evnt_stat ses,
SCHD_EVNT_ATTENDEE sea,
CLIENT_APPT ca
WHERE
c.id = ca.client_id_k AND
au1.APP_ROLE_NAM_DESKTOP_K = sea.ATTENDEE_ID_K AND
ssc.code = ses.SCHD_STAT_CD_CODE_K AND
seu.code = se.SCHD_EVNT_URL_CODE_K AND
se.id = ses.SCHD_EVNT_ID_K AND
se.id = sea.SCHD_EVNT_ID_K AND
se.id = ca.SCHD_EVNT_ID_K AND
sea.ATTENDEE_TYP = 'ROLE' AND
ses.create_ts = (select max(create_ts) FROM SCHD_evnt_stat ses1 WHERE ses1.SCHD_EVNT_ID_K = ses.SCHD_EVNT_ID_K)
Thanks in advance
prasanth a.s.

Answer 1

Hi,
it is difficult to change this query without the possibility to test it in a worksheet. But try the following query.
I think it should be the same result as your 3 queries.
SELECT au1.bu_id,
     au1.first_nam,
     au1.last_nam,
     c.id,
     c.first_nam_d,
     c.last_nam_d,
     c.birth_dte_d,
     c.ssn_num_d,
     se.id schd_event_id,
     seu.dsc,ssc.dsc,
     decode(sea.access_typ,NULL,' ',sea.access_typ) AS sea.access_typ,
     decode(sea.ATTENDEE_TYP,NULL,' ',sea.ATTENDEE_TYP) AS sea.ATTENDEE_TYP
FROM CLIENT c,
     APP_USER au1,
     SCHD_STAT_CD ssc,
     schd_event_url seu,
     schd_evnt se,
     SCHD_evnt_stat ses,
     SCHD_EVNT_ATTENDEE sea,
     CLIENT_APPT ca
WHERE c.id = ca.client_id_k
AND au1.bu_id = se.APP_USER_BU_ID_PRIME_K
AND ssc.code = ses.SCHD_STAT_CD_CODE_K
AND seu.code = se.SCHD_EVNT_URL_CODE_K
AND se.id = ses.SCHD_EVNT_ID_K
AND se.id = ca.SCHD_EVNT_ID_K
AND ses.create_ts = (select max(create_ts)
FROM SCHD_evnt_stat ses1
                         WHERE ses1.SCHD_EVNT_ID_K = ses.SCHD_EVNT_ID_K)
AND
(sea.ATTENDEE_TYP(+) = 'WORKER' AND se.id = sea.SCHD_EVNT_ID_K(+)) --clause of the 1st query
OR
(sea.ATTENDEE_TYP = 'ROLE' AND se.id = sea.SCHD_EVNT_ID_K)               --clause of the 2nd query
OR
(sea.ATTENDEE_TYP = 'ROLE' AND se.id = sea.SCHD_EVNT_ID_K AND au1.APP_ROLE_NAM_DESKTOP_K = sea.ATTENDEE_ID_K) --clause of the 3rd query
);