Seat Distribution-Can, we do in SQL?

Hello

11 GR 2 DB

Here is the table structure and data (data and the Test tables)
create table seat_master(grade varchar2(1),balance number);

insert into seat_master values('A',3);
insert into seat_master values('B',2);
insert into seat_master values('C',1);
insert into seat_master values('D',1);
insert into seat_master values('E',6);

create table seat_reservation(res_id varchar2(5),grade varchar2(1),
            res_count number,group_flag varchar2(1));

insert into seat_reservation values('R1','A',2,'Y');
insert into seat_reservation values('R2','B',1,'Y');
insert into seat_reservation values('R3','A',2,'Y');
insert into seat_reservation values('R4','C',2,'N');
insert into seat_reservation values('R5','E',3,'N');
insert into seat_reservation values('R6','D',2,'N');

select *
from seat_master;

GRADE BALANCE
----- -------
A           3 
B           2 
C           1 
D           1 
E           6 


select *
from seat_reservation;

RES_ID GRADE RES_COUNT GROUP_FLAG
------ ----- --------- ----------
R1     A             2 Y          
R2     B             1 Y          
R3     A             2 Y          
R4     C             2 N          
R5     E             3 N          
R6     D             2 N          

 6 rows selected 
Now, the goal is to distribute the seats according to the booking.

Rules:
Distribution of seats is done according to the order of the (ORDER OF RES_ID) RES_ID
A is the highest grade and E is the lowest.
For one person booked for A, and if the balance is not available for him will be given B (and C, D, E).
A person reserved for B, and if the balance is not available for him will be given C (then D, E), but optical quality will not be given
GROUP_FLAG means that the reserve must be in the same category-
For example, R1, is for 2 seats in the a. They won't 1 seat and 1 seat in B.Both the two seats should be in A or B or C...
And for a booking, seats should be allocated that if the total number of requestd is if requested available.ie count is 2 and is only available in the particular category or below it cannot be awarded

The expected results are:
RES_ID SEAT 
------ ----
R1          A1 
R1          A2--Two A grade seats for R1, as R1 has RES_COUNT-2
       
R2     B1

R3          E1--R3 is given E grade, bcause as per now 2 seats 
R3          E2--are not available in A or B or C.And GroupFlag is Y for him

R4          C1--Only one seat availabl in C grade, so next seat will be Given
R4          D1--in lower available grade

R5          E3
R5          E4
R5          E5
R6            --Blank as only one seat can be awarded
Currently, this is done in PL/SQL, we can do it in SQL?

Thank you.

Published by: 884476 on November 18, 2012 12:14 AM

Hello

As I said before the query can be optimized.

I also solved a problem for the group_flag = ' don't
He showed plenty of seats assigned in case there are too many availlable.

See the result below:

WITH BAL AS
--ADD A '0' SEAT TO THE LIST OF SEATS
  (select * from seat_master UNION ALL
  SELECT '0', 0 FROM DUAL
  )
,MOD_IN AS
  (
  SELECT
    SR.RES_ID
    ,RANK() OVER (PARTITION BY BAL.GRADE ORDER BY SR.RES_ID) RES_NO
    ,BAL.GRADE
    ,BAL.BALANCE
    ,SR.GRADE    RES_GRADE
    ,CASE WHEN BAL.GRADE = '0' THEN SR.RES_COUNT ELSE 0 END RES_COUNT
    ,SR.GROUP_FLAG
  FROM
    SEAT_RESERVATION SR
    ,BAL
  )
,MDL AS
  (
  SELECT
    *
  FROM
    MOD_IN
  MODEL
  DIMENSION BY (RES_NO, GRADE)
  MEASURES ( RES_ID, BALANCE,RES_GRADE, RES_COUNT, GROUP_FLAG GF)
  RULES
  SEQUENTIAL ORDER
  ITERATE(10) UNTIL (RES_ID[ITERATION_NUMBER + 1,0] IS NULL)
    (
    --DISTRIBUTE SEATS PER REQUEST
    RES_COUNT[ITERATION_NUMBER + 1, FOR GRADE in (select grade FROM BAL WHERE GRADE > '0' ORDER BY GRADE )] =
            CASE WHEN GF[CV(),CV()] = 'Y'
                      AND MAX(RES_COUNT) [CV(), GRADE > '0'] = 0
                      AND BALANCE[CV(), CV()] >= RES_COUNT[CV(),0]
                      AND RES_GRADE[CV(), CV()] <= CV(GRADE)
                 THEN RES_COUNT[CV(),0] 

                      WHEN GF[CV(),CV()] = 'N'
                      AND SUM(RES_COUNT) [CV(), GRADE > '0'] < RES_COUNT[ITERATION_NUMBER + 1,0]
                      AND SUM(BALANCE) [CV(), GRADE >= RES_GRADE[CV(),CV()] ] >= RES_COUNT[CV(),0]
                      AND RES_GRADE[CV(), CV()] <= CV(GRADE)
                 THEN LEAST(2 * RES_COUNT[CV(),0] - SUM(RES_COUNT) [CV(), GRADE < CV(GRADE)], BALANCE[CV(), CV()] )
                 ELSE 0 END

    --UPDATE CURRENT BALLANCE
    ,BALANCE[ITERATION_NUMBER + 1, ANY] = BALANCE[CV(), CV()] - RES_COUNT[CV(),CV()]
    --UPDATE NEXT BALANCE
    ,BALANCE[ITERATION_NUMBER + 2, ANY] = BALANCE[ITERATION_NUMBER + 1, CV()]
    )
  )

SELECT
  MDL.RES_ID
  ,MDL.GRADE || COUNT(1) OVER (PARTITION BY MDL.GRADE ORDER BY MDL.RES_ID, SC.LVL) SEAT
FROM
  MDL
  ,(SELECT LEVEL LVL FROM DUAL CONNECT BY LEVEL < 100)  SC

WHERE
  MDL.RES_COUNT       > 0
  AND MDL.GRADE       > '0'
  AND SC.LVL          <= MDL.RES_COUNT

ORDER BY
  1,2
;

RES_ID SEAT
------ -----------------------------------------
R1     A1
R1     A2
R2     B1
R3     E1
R3     E2
R4     C1
R4     D1
R5     E3
R5     E4
R5     E5                                        

 10 rows selected

Kind regards

Peter

Published by: Peter vd Zwan on 27 November 2012 13:35
Changed the end result to match output OP

Tags: Database

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    -------------------------------
    ID | FULLNAME | TYPE
    1 Caroline T ABC
    2 Mary C DEF
    3 Peter J ABC

    TB
    ----------------------
    ID | FIRSTNAME
    1 Caroline
    1 Carol
    1 C,
    3 Peter

    I need to update TB with the new names of TA where type is 'ABC', but only for those areas that have count (TB.ID) = 1
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    Server Oracle 11 g is
    Thank you!

    Hello

    One way is to join your and tb in the USING clause and eliminate duplicates it.

    MERGE INTO     tb     dst
USING   (
         SELECT    ta.id
         ,           REGEXP_SUBSTR ( MIN (ta.fullname)
                                , '^[^,]*'
                        )     AS firstname
         FROM      ta
         JOIN      tb  ON  ta.id     = tb.id
         WHERE     ta.type      = 'ABC'
         GROUP BY  ta.id
         HAVING    COUNT (*)     = 1
     )                   src
ON     (scr.id      = dst.id)
WHEN MATCHED THEN UPDATE
SET     dst.firstname     = src.firstname
;

    If you would care to post CREATE TABLE and INSERT statements for your sample data, and then I could test this.

    I used REGEXP_SUBST instead of SUBSTR and INSTR to search for the first name, because I find it a little cleaner, and because it returns something even when there is none "," fullname, which I assume is what you really want. (None of the fullnames in your sample data have ','s.) You can use SUBSTR and INSTR instead.

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