Select one record per person from multiple conditions

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
                               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'
                   END = 'Y' Meaning that if the person has records that meet more than one of the above cases, it should choose the record matching the First Case of the case statement. If the records do not meet the first case at all then look to see if it meets the second case and if it does choose that record, etc.
Sample Data:
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
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 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'
                   END = 'Y'

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
       921 8284 201130 201030 UG   Y Y V Y LA           1Io you get the correct output for the original ids?
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
                                                   AND   student_population       != 'V'
                                                   AND   program                is not null
                                        THEN 1
                                                WHEN primary_program_ind      = 'Y'     --Visitors (Each term considered new)
                                                   AND   student_population      = 'V'
                                                   AND   academic_period_admitted is not null
                                        THEN 2
                                                WHEN primary_program_ind      = 'Y'     --Normal Cases
                                               AND   academic_period_admitted is not null
                                        THEN 3
                                         END
                       )     AS r_num
     FROM     multirows     m
--     WHERE     ...     -- If you need any filtering, this is where it goes
SELECT     *     -- or list all columns except r_num
FROM     got_r_num
WHERE     r_num     = 1
;

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order by MSG_DATE_INFOoutput of this query is...
>
ddd     12345          13-Mar-10 19:43:03
eee     54321     Tamil Nadu, India      13-Mar-10 19:39:48
ddd     12345          13-Mar-10 19:32:58
eee     54321     Tamil Nadu, India      13-Mar-10 19:30:07
ddd     12345          13-Mar-10 19:23:08
eee     54321     Tamil Nadu, India      13-Mar-10 19:20:14
fff     98765          13-Mar-10 19:19:22
ddd     12345          13-Mar-10 19:13:01
eee     54321     Tamil Nadu, India      13-Mar-10 19:09:50
ddd     12345          13-Mar-10 19:02:56
eee     54321     tn,ind      13-Mar-10 18:59:49
ddd     12345          13-Mar-10 18:53:08
eee     54321     tn,ind      13-Mar-10 18:49:50
ddd     12345          13-Mar-10 18:42:56
eee     54321     tn,ind      13-Mar-10 18:39:50
ddd     12345          13-Mar-10 18:33:00
eee     54321     tn,ind      13-Mar-10 18:29:50
ddd     12345          13-Mar-10 18:22:54
eee     54321     tn,ind      13-Mar-10 18:19:50
ddd     12345          13-Mar-10 18:12:56
eee     54321     tn,ind      13-Mar-10 18:09:50
ddd     12345          13-Mar-10 18:02:54
eee     54321     tn,ind      13-Mar-10 18:00:02
fff     98765     Tamil Nadu, India      13-Mar-10 17:59:26
fff     98765     Tamil Nadu, India      13-Mar-10 17:54:26
ddd     12345          13-Mar-10 17:52:56
eee     54321     tn,ind      13-Mar-10 17:49:50
fff     98765     Tamil Nadu, India      13-Mar-10 17:49:25
fff     98765     Tamil Nadu, India      13-Mar-10 17:44:26
ddd     12345          13-Mar-10 17:42:56
>
from this output i want only one latest record for each member(ddd,eee,fff). i.e
>
ddd     12345          13-Mar-10 19:43:03
eee     54321     Tamil Nadu, India      13-Mar-10 19:39:48
fff     98765          13-Mar-10 19:19:22
>
how to modify the query to achieve this...?

Hi,
This is not giving the result which i want...
table is
CREATE TABLE TRACKING_REPORT
ID               NUMBER,
MSISDN           NUMBER(12)                   NOT NULL,
X                NUMBER(15,8)                 NOT NULL,
Y                NUMBER(15,8)                 NOT NULL,
TIME_STAMP       DATE,
MSG_DATE_INFO    DATE                         DEFAULT sysdate,
ADDRESS1_GOOGLE VARCHAR2(400 BYTE),
ADDRESS2_GOOGLE VARCHAR2(400 BYTE),
ADDRESS_MLINFO   VARCHAR2(400 BYTE),
REQ_ID           VARCHAR2(30 BYTE)
CREATE TABLE RESOURCE_INFO
RESOURCE_ID    NUMBER,
MSISDN         NUMBER,
RESOURCE_NAME VARCHAR2(25 BYTE),
ADDRESS        VARCHAR2(100 BYTE),
COM_ID         VARCHAR2(20 BYTE),
ADMIN_ID       NUMBER,
TIME_STAMP     DATE                           DEFAULT SYSDATE,
GROUP_ID       NUMBER
)

How to get only one record per machine

I have this SQL statement that works.
SELECT
cn.Name0 AS [Computer Name],
cn.Model0 AS [Model],
cn.Manufacturer0 AS [Manufacturer],
bios.SerialNumber0 AS [Serial Number],
rs.Operating_System_Name_and0 AS [OS Type],
--ld.FreeSpace0 AS [Free Disk Space],
--ld.Size0 AS [Actual Disk Size],
x86.TotalPhysicalMemory0 AS [Total Memory],
aa.SMS_Assigned_Sites0 AS [Assigned Site]
FROM
v_GS_COMPUTER_SYSTEM cn INNER JOIN v_GS_LOGICAL_DISK ld on cn.ResourceID = ld.ResourceID
INNER JOIN v_GS_PARTITION gs ON cn.ResourceID = gs.ResourceID
INNER JOIN v_GS_X86_PC_MEMORY x86 ON gs.ResourceID = x86.ResourceID
INNER JOIN v_R_System rs ON gs.ResourceID = rs.resourceID
INNER JOIN v_GS_PC_BIOS bios ON rs.resourceID = bios.ResourceID
INNER JOIN v_RA_System_SMSAssignedSites aa ON bios.ResourceID = aa.ResourceID
WHERE
cn.Model0 LIKE '%780%'
ORDER BY
cn.Name0
The problem is whent his runs it returns multiple rows for each serial number/machine it finds. So I'll have 5 or 6 rows for the exact same machine. How do I make it only give me 1 row for each serial number/machine?
mqh7

... because you added v_GS_PARTITION gs (which results in multiple rows per resource) and then you are doing the inner join blues.
This should be better:
SELECT
cn.Name0 AS [Computer Name],
cn.Model0 AS [Model],
cn.Manufacturer0 AS [Manufacturer],
bios.SerialNumber0 AS [Serial Number],
rs.Operating_System_Name_and0 AS [OS Type],
--ld.FreeSpace0 AS [Free Disk Space],
--ld.Size0 AS [Actual Disk Size],
x86.TotalPhysicalMemory0 AS [Total Memory],
aa.SMS_Assigned_Sites0 AS [Assigned Site]
FROM
v_GS_COMPUTER_SYSTEM cn
-- INNER JOIN v_GS_LOGICAL_DISK ld on cn.ResourceID = ld.ResourceID
--INNER JOIN v_GS_PARTITION gs ON cn.ResourceID = gs.ResourceID
INNER JOIN v_GS_X86_PC_MEMORY x86 ON x86.ResourceID = cn.ResourceID
INNER JOIN v_R_System rs ON rs.ResourceID = cn.resourceID
INNER JOIN v_GS_PC_BIOS bios ON bios.resourceID = cn.ResourceID
INNER JOIN v_RA_System_SMSAssignedSites aa ON aa.ResourceID = cn.ResourceID
WHERE cn.Model0 LIKE '%780%'
ORDER BY
cn.Name0
Torsten Meringer | http://www.mssccmfaq.de

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