Selecting the records

hey guys i need ur help. I have columns with values in a table like this
flag -- reading --amount
Y --10 --300
N --40 --NULL
N --50 --NULL
Y --50 --200
N --50 --NULL
now i have to calculate the split_amount for each individual READING based on first value of AMOUNT .The amount should be split till you find the next flag set to 'Y' .the output should show like this
flag -- reading-- amount-- split_amount
Y --10 --300 --30
N --40 NULL 120
N --50 NULL 150
Y --50 --200 -- 100
N --50 NULL 100
can anyone help with a select query

Hi,
(1) I see the ordering column now. "Date" is a reserved word, and you're simply asking for trouble if you name a column that way.
There seemes to be a new column, miles, in your latest posting. Provide the data for it, or explain.
(2) What are the results you want from that sample data?
(3) Your existing query is full of syntax errors. If you don't know how to fix them, post the error messages.
If the data is really what you posted, then why are you doing a GROUP BY? If the GROUP BY is necessary, include some examples of why it is needed in your sample data.
If you have to use both analytic and aggregate (GROUP BY) functions, I suggest you do them in separate queries.
For example, you can do a GROUP BY (without the analytic LAST_VALUE) in a sub-query, then use LAST_VALUE in the super-querry.
Type (all small letters) before and after code and ouput postings.

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Perhaps been staring at this too long and making changes to try and gather the correct population, but can't seem to figure it out at the moment. Trying to determine logic to select one record per person. If person has more than one record would like to choose the record that matches the sequence priority which is:
AND CASE WHEN ac.primary_program_ind = 'N'                                       --Existing Students who have a new program (Continuing Law and added Business)
                               AND ac.academic_period_admitted = ac.academic_period
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SELECT 363 AS PERSON_UID, '1875' AS ID, '201140' AS ACADEMIC_PERIOD, '201040' AS ACADEMIC_PERIOD_ADMITTED, 'UG' AS STUDENT_LEVEL, '' AS EXIST_NEWPROG, 'Y' AS VISITORS, 'Y' AS NORMAL, 'V' AS STUDENT_POPULATION, 'Y' AS PRIMARY_PROGRAM_IND, 'LA' AS PROGRAM FROM DUAL
UNION SELECT 852, '1962', '201130', '201040', 'GR', '', '', 'Y', 'C', 'Y', 'MS' FROM DUAL
UNION SELECT 852, '1962', '201140', '201140', 'GR', 'Y', '', '', 'G', 'N', 'MBA' FROM DUAL
UNION SELECT 852, '1962', '201140', '201040', 'GR', '', '', 'Y', 'G', 'Y', 'MS' FROM DUAL
UNION SELECT 659, '1093', '201140', '200840', 'UG', '', '', 'Y', 'T', 'Y', 'BB' FROM DUALSo for the above data on ID '1962', I would like to select the record that has EXIST_NEWPROG = 'Y' and ignore the other rows for that ID. Note:EXIST_NEWPROG, VISITORS, NORMAL I added to sample data, these cols don't actually exist. Put in for easier display purpose to show what case statements are doing. The actual sql statement has many joins and where statements, but hopefully this simplification of the sql will be sufficient to derive a solution.
WITH MULTIROWS AS
SELECT 363 AS PERSON_UID, '1875' AS ID, '201140' AS ACADEMIC_PERIOD, '201040' AS ACADEMIC_PERIOD_ADMITTED, 'UG' AS STUDENT_LEVEL, '' AS EXIST_NEWPROG, 'Y' AS VISITORS, 'Y' AS NORMAL, 'V' AS STUDENT_POPULATION, 'Y' AS PRIMARY_PROGRAM_IND, 'LA' AS PROGRAM FROM DUAL
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UNION SELECT 852, '1962', '201140', '201140', 'GR', 'Y', '', '', 'G', 'N', 'MBA' FROM DUAL
UNION SELECT 852, '1962', '201140', '201040', 'GR', '', '', 'Y', 'G', 'Y', 'MS' FROM DUAL
UNION SELECT 659, '1093', '201140', '200840', 'UG', '', '', 'Y', 'T', 'Y', 'BB' FROM DUAL
select *
from multirows ac
where CASE WHEN ac.primary_program_ind = 'N'                                       --Existing Students who have a new program (Continuing Law and added Business)
                               AND ac.academic_period_admitted = ac.academic_period
                               AND ac.student_population <> 'V'
                               AND ac.program is not null THEN 'Y'
                            WHEN ac.primary_program_ind = 'Y'                                        --Visitors (Each term considered new)
                               AND ac.student_population = 'V'
                               AND ac.academic_period_admitted is not null THEN 'Y'
                            WHEN ac.primary_program_ind = 'Y'                                        --Normal Cases
                               AND ac.academic_period_admitted is not null THEN 'Y' --= ac.academic_period THEN 'Y'
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Hi,
user1069723 wrote:
Thanks Frank. I've been incorporating your solution and going over the data, (which is why it has taken so long to respond) and am getting closer, however the approach you provided excludes people who have a "RNum" of 2 or 3, but do not have a 1 at all. So people that only have a 2 and 3 OR only have a 2 or only have a 3 would not be captured, but if there is only one record, they would be missed.
Here is another set of records of one person.
SELECT 921 AS PERSON_UID, '8284' AS ID, '201130' AS ACADEMIC_PERIOD, '201030' AS ACADEMIC_PERIOD_ADMITTED, 'UG' AS STUDENT_LEVEL, '' AS EXIST_NEWPROG, 'Y' AS VISITORS, 'Y' AS NORMAL, 'V' AS STUDENT_POPULATION, 'Y' AS PRIMARY_PROGRAM_IND, 'LA' AS PROGRAM FROM DUAL
UNION SELECT 921, '8284', '201140', '201040', 'UG', '', '', 'Y', 'F', 'Y', 'BB' FROM DUAL
Sorry, I can't reproduce the problem.
If I add the two new rows of sample data that you posted today to the data you posted yesterday, then the query I posted yesterday produces:
PERSON_UID ID   ACADEM ACADEM ST E V N S P PRO      R_NUM
       659 1093 201140 200840 UG     Y T Y BB           1
       363 1875 201140 201040 UG   Y Y V Y LA           1
       852 1962 201140 201140 GR Y     G N MBA          1
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If I DELETE all the rows where id != 8284 I still get the same results for id=8284.
'm using Oracle 11.1.0.6.0. What version are you running?
Post your exact code, even iof you think you copied it from thsi site without any changes. Perhaps there was some subtle eidting mistake.
I would like to select the record for Academic_Period = 201140 for this person. Is the problem that you're getting the wrong row for id=8284, or that you're not getting any output for id=8284?
Why would you want to get the row with academic_period=201140? (Let's call this row A.) Why don't you want the other row for that person, the one with academic_period=201130? (Let's call this row B.) On both of those rows, primary_program_ind='Y' and academic_period_admitted is not NULL. The only significant difference between those two rows is that student_population='F' on row A, and it's 'V' on row B. Doesn't that mean that row B causes the CASE expression to return 3 ("Normal Case"), while row B makes it return 2 ("Visitor")? Doesn't that mean row B should be preferred to row A?
Then again, perhaps this is just what you mean by saying that "term" is the main factor in deciding which row to select, and that the CASE expreesion ("New Program" before "Visitors", followed by "Normal Cases") is just a tie-breaker.
Based on my understanding of the code you provided, this person is being excluded altogether because they do not have a record that evaluates to rnum = 1.ROW_NUMBER never returns a value of 2 or 3 unless it has already returned a value of 1. (At least that's how it's supposed to work, and I've never heard of any bugs concerning it.)
This record is also complicated because it has two terms, Does "term" mean "academic_period" here?
in all cases, we would want to select the highest term and then if there is still more than one qualifying record, base the "tie breaker" on the cases. Does this make sense or is my explanation still unclear?It's unclear.
Maybe you need to add one more line at the beginning of the analytic ORDER BY clause (the 6th line below):
WITH     got_r_num     AS
     SELECT     m.*
     ,     ROW_NUMBER () OVER ( PARTITION BY id
                         ORDER BY
                                         academic_period     DESC,          -- Added
                                         CASE
                                   WHEN primary_program_ind      = 'N'     --Existing Students who have a new program (Continuing Law and added Business)
                                                   AND   academic_period_admitted      = academic_period
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                                                   AND   student_population      = 'V'
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                                        THEN 2
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                                               AND   academic_period_admitted is not null
                                        THEN 3
                                         END
                       )     AS r_num
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problem is only one record is displayed in the review jsp page. Though i used "while(rs.next())".How many records were retrieved in the 'while (rs.next())' loop?
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