Oracle-L: RE: Query rewrite help needed

From: Kamaljeet Singh <kamalj_at_mahindrabt.com>
Date: Mon, 10 Mar 2003 05:58:48 -0800
Message-ID: <F001.0056461F.20030310055848@fatcity.com>

select a.OP_FL_PLAN_KEY,       
a.FLIGHT_NO,            
a.ORIGIN,                 
a.DESTINATION,           
a.SEG_DEP_DATE_TIME,     
a.SEG_ARR_DATE_TIME,    
a.DEP_DAY_CHG,            
a.ARR_DAY_CHG,         
decode(a.ac_type,'JET',c.AC_TYPE,a.ac_type)               
a.AC_GRP, b.exp_lat_date_time,
b.imp_toa_date_time,

b.spl_code from

op_fl_plan a, op_fl_service_times b, op_ac_type c,
op_restriction d,
op_restriction_rq e

where a.op_fl_plan_key = b.op_fl_plan_key

and a.op_fl_plan_key = e.op_fl_plan_key
and b.op_fl_service_times_key = d.op_fl_service_times_key
and a.op_fl_plan_key = c.op_fl_plan_key
and b.exp_lat_date_time >= :eldt
and b.imp_toa_date_time <= :itdt 
and b.spl_code in(:spl_code1, :spl_code2)
and b.service = :srv and a.origin = :o and a.destination = :d
and substr(a.flight_no, 1, 2) = :flight_no

and a.ac_grp in(:ac_grp)
and trunc(a.seg_dep_date_time) = :seg_dep_date

and e.spl_code in(:spl_code1, :spl_code2)
and d.spl_code not in(:spl_code1, :spl_code2)
and d.position in('E', 'I')

Regards,

Kamaljeet Singh (NCDB ASG)
MBT, 52 Barrack Square, Martlesham. IP5 3RF. Off. 01473 667170
Mob. 077 5368 5370
kamaljeet.singh_at_bt.com

-----Original Message-----
Krishnaswamy, Ranganath
Sent: 10 March 2003 12:49
To: Multiple recipients of list ORACLE-L

Hi List,

I have the below query which is very long and it contains an UNION
clause as the query has to select ac_type from op_ac_type table if op_fl_plan.op-ac_type = 'JET' while it should select op_ac_type from op_fl_plan table if op_fl_plan.ac_type = 'JET'. Is it possible to rewrite
the query using DECODE statement or CASE statement or self joins to return
the same result set? If so, please let me know the same. Any help in this
regard is very much appreciated.

Thanks and Regards,

Ranganath

select a.OP_FL_PLAN_KEY,       
a.FLIGHT_NO,            
a.ORIGIN,                 
a.DESTINATION,           
a.SEG_DEP_DATE_TIME,     
a.SEG_ARR_DATE_TIME,    
a.DEP_DAY_CHG,            
a.ARR_DAY_CHG,         
a.AC_TYPE,               
a.AC_GRP, b.exp_lat_date_time,
b.imp_toa_date_time,

b.spl_code from

op_fl_plan a, op_fl_service_times b, 
op_restriction d,
op_restriction_rq e

where a.op_fl_plan_key = b.op_fl_plan_key

and a.op_fl_plan_key = e.op_fl_plan_key
and b.op_fl_service_times_key = d.op_fl_service_times_key
and a.ac_type <> 'JET'
and b.exp_lat_date_time >= :eldt
and b.imp_toa_date_time <= :itdt 
and b.spl_code in(:spl_code1, :spl_code2)
and b.service = :srv and a.origin = :o and a.destination = :d
and substr(a.flight_no, 1, 2) = :flight_no

and a.ac_grp in(:ac_grp)
and trunc(a.seg_dep_date_time) = :seg_dep_date

and e.spl_code in(:spl_code1, :spl_code2)
and d.spl_code not in(:spl_code1, :spl_code2)
and d.position in('E', 'I')
union
select a.OP_FL_PLAN_KEY,       
a.FLIGHT_NO,            
a.ORIGIN,                 
a.DESTINATION,           
a.SEG_DEP_DATE_TIME,     
a.SEG_ARR_DATE_TIME,    
a.DEP_DAY_CHG,            
a.ARR_DAY_CHG,         
c.AC_TYPE,               
a.AC_GRP, b.exp_lat_date_time,
b.imp_toa_date_time,

b.spl_code from

op_fl_plan a, op_fl_service_times b, op_ac_type c,
op_restriction d,
op_restriction_rq e

where a.op_fl_plan_key = b.op_fl_plan_key

and a.op_fl_plan_key = e.op_fl_plan_key
and b.op_fl_service_times_key = d.op_fl_service_times_key
and a.op_fl_plan_key = c.op_fl_plan_key
and a.ac_type = 'JET'
and b.exp_lat_date_time >= :eldt
and b.imp_toa_date_time <= :itdt 
and b.spl_code in(:spl_code1, :spl_code2)
and b.service = :srv and a.origin = :o and a.destination = :d
and substr(a.flight_no, 1, 2) = :flight_no

and a.ac_grp in(:ac_grp)
and trunc(a.seg_dep_date_time) = :seg_dep_date

and e.spl_code in(:spl_code1, :spl_code2)
and d.spl_code not in(:spl_code1, :spl_code2)
and d.position in('E', 'I')

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--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Krishnaswamy, Ranganath
INET: Ranganath.Krishnaswamy_at_blr.hpsglobal.com

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--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Kamaljeet Singh
INET: kamalj_at_mahindrabt.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
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