Question

Help with SQL Query

Asked by: TECH_NET

Need help with the data retrieval
ID       CITY_D      CITY_A      ZONE_ID      AIRLINE      FARE
1       1       18       2       68      1700
2       1       18       2       68      2089
3       1       18                3      68      1300
4       1       18      2      56      1400

City_D=1 is Atlanta
City_A=18 is Australia
Zone_ID 2 is mid-may to mid-june
airlines
68 is Air France and 56 Delta

Now i need to run a query that retrieve the cost cost per sector ie Atlanta to Australia in a given season ( ie condition clause includes CITY_A,CITY_D and ZONE_ID
if for a given sector with different fares by the same airlines, the lowest airfare record should be retrieved.


In the above eg. ID=2 should not be returned since it fare is over the ID=1 which is lower. The out put should be as follows.
1       1       18       2       68      1700
3       1       18                3      68      1300
4       1       18      2      56      1400

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Asked On
2007-05-22 at 09:19:13ID22587688
Tags

query

,

condition

,

help

Topic

SQL Server 2005

Participating Experts
2
Points
250
Comments
5

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    Answers

     

    by: daletianPosted on 2007-05-22 at 10:16:17ID: 19135663

    SELECT MIN(FARE) FARE, CITY_A,CITY_D, ZONE_ID
    FROM TABLEFARES
    GROUP BY  CITY_A,CITY_D, ZONE_ID

     

    by: LowfatspreadPosted on 2007-05-22 at 10:16:40ID: 19135668

    select x.*
      from tableA as x
     Inner Join (select city_d,city_a,zone_id,airline,min(fare) as fare ,min(id) as id
                         from tableA
                       Group by city_d,city_a,zone_id,airline  
                      ) as Y
      on x.id=y.id
     order by x.id

    Assuming ID is the primary key of the table
    select x.*
      from tableA as x
     Inner Join (select city_d,city_a,zone_id,airline,min(fare) as fare ,min(id) as id
                         from tableA
                       Group by city_d,city_a,zone_id,airline  
                      ) as Y
      on x.city_d=y.city_d
    and x.city_a=y.city_A
    and x.zone_id=y.zone_id
    and x.airline=y.airline
    and x.fare=y.fare
    and x.id=y.id
    order by x.id

    if id isn't the primary key

     order by x.id

    or

     

    by: daletianPosted on 2007-05-22 at 10:17:52ID: 19135675

    rearranging in the order u've given

    SELECT ID, CITY_D, CITY_A, ZONE_ID, AIRLINE, MIN(FARE) FARE,
    FROM TABLEFARES
    GROUP BY  CITY_A,CITY_D, ZONE_ID, AIRLIN

     

    by: TECH_NETPosted on 2007-05-22 at 11:34:44ID: 19136275

    Hi Lowfatspread,
    I used your solution and ran the query against by db .
    select x.*
      from MYTEST as x
     Inner Join (select city_d,city_a,zone_id,AIRLINE_ID,min(fare) as fare ,min(id) as id
                         from MYTEST
                       Group by city_d,city_a,zone_id,AIRLINE_ID  
                      ) as Y
      on x.id=y.id
    Where x.zone_id=2
     order by x.id

    Here is the change i made ( i added a select criteria (ie Where x.zone_id=2) and check out the results

    and when i added a new row
    ID       CITY_D      CITY_A      ZONE_ID      AIRLINE      FARE
    5         1           18                 2                   68               100

    the fare of 100 is the lowest compared to ID =1 which has the same criteria. but i showed up the ID=1 and not ID=5.

    ID is the primary key.

    Am i making a mistake.

     

    by: TECH_NETPosted on 2007-05-22 at 11:36:33ID: 19136287

    FARE COlumn is Type Numeric

    20120131-EE-VQP-002

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