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Selecting multiple rows which meet condition  oracle 9 sql

Posted on 2008-11-03
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Last Modified: 2013-12-19
Please see the attached which displays a) the current output and b) the desired output.

The data is looking at a specific question and answers given to the question in an electronic form for three different clients. This particular question is looking at the ethnicity recorded for a client. Each answer is recorded in 4 pieces of data:

CAT_DESC
START_DATE
END_DATE
NOTES

Each answer may have multiple instances of the above data (see client_id 202579), but the start and end dates of the categories cannot overlap.

Id like the output to only list open categories and the associated start date and notes, i.e. where there is no end date. Any help with this is appreciated.
output-example.xls
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Question by:tonMachine100
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3 Comments
 
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Expert Comment

by:MikeOM_DBA
ID: 22867785

Try something like this:

Select * From Mytable A
 Where Exists (
 Select Null From Mytable B
  Where B.Qst_Type              = A.Qst_Type
    And B.Qst_Code              = A.Qst_Code
    And B.Qst_Id                = A.Qst_Id
    And B.Ans_Qst_Code          = A.Ans_Qst_Code
    And B.Client_Id             = A.Client_Id
    And B.Ans_Id                = A.Ans_Id
    And B.Avd_Seq               = A.Avd_Seq 
    And B.Anv_Name              = 'End_Date'
    And B.Answer Is Null        = A.Answer Is Null
/

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Accepted Solution

by:
MikeOM_DBA earned 400 total points
ID: 22868006
Ooops, typo:

Select * From Mytable A
 Where Exists (
 Select Null From Mytable B
  Where B.Qst_Type              = A.Qst_Type
    And B.Qst_Code              = A.Qst_Code
    And B.Qst_Id                = A.Qst_Id
    And B.Ans_Qst_Code          = A.Ans_Qst_Code
    And B.Client_Id             = A.Client_Id
    And B.Ans_Id                = A.Ans_Id
    And B.Avd_Seq               = A.Avd_Seq 
    And B.Anv_Name              = 'END_DATE'
    And B.Answer Is Null
/

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Author Closing Comment

by:tonMachine100
ID: 31512642
thats spot on. thanks for your help!
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