Query rewrite help needed

From: Krishnaswamy, Ranganath <Ranganath.Krishnaswamy_at_blr.hpsglobal.com>
Date: Mon, 10 Mar 2003 03:33:37 -0800
Message-ID: <F001.005644DA.20030310033337@fatcity.com>

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

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