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Trying to delete "repeated" data

  1. #1
    andy49's Avatar
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    Trying to delete "repeated" data

    Through bad planning (in the database where I export data from), i get the following:

    StudentID_PK Firstname Surname UPN YearGp MathsClass MathsTeacher
    702 John Smith abcdefg 10 10xy/Mm2


    703 John Smith abcdefg 10 10x/Mm3

    Unfortunately I only need the second one.

    Can anyone suggest ways to do this.
    The data is in a CSV file. Access imports it from there into a table.
    Andy to all.
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  2. #2
    orange's Avatar
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    Not enough info.
    How did the 702, 703 get assigned? Sounds like a normalization issue??
    The record deals with a Student/MathClass/UPN/Year and Teacher (object/construct).

    Here is a free video by Dr. Jennifer Widom that overviews normalization and database design.

    Be aware, she is very quick ---but you can pause, rewind, repeat..

    Good luck.

  3. #3
    andy49's Avatar
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    Sorry the 702 and 703 are in the table when the data is imported.

    (the data from the CSV file doesn't include these values)
    Andy to all.
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  4. #4
    orange's Avatar
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    Readers need to know more about your set up.
    -what the data represents
    -where it comes from
    -why do you need 703 and not 702?? what are the facts surrounding this??

  5. #5
    aytee111 is online now Competent At Times
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    See "Delete Duplicate Records" http://allenbrowne.com/subquery-01.html

  6. #6
    orange's Avatar
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    aytee why do you think these are duplicates?
    They have different values for both
    studentID_PK and MathsClass

    So what we are being shown are NOT duplicates. There's more to the story than what has been posted.

  7. #7
    aytee111 is online now Competent At Times
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    Right. It is the name that is duplicated, Andy will need more criteria.

  8. #8
    andy49's Avatar
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    They aren't really duplicates in the database sense

    Some idiot gave them separate class codes on the school's main Sims database (which I have no control over)


    The Sims database runs a report daily to update my database with Firstname, Lastname, UPN (a special unique number to each student), Maths group and the empty column mathsteacher

    this is stored as a CSV file at about 3am and I update my tblStudent on my access DB with it daily.

    So one of John Smiths classes is a Maths class. The shorter one!!

    I eventually cracked it with this thanks to Aytee111's advice and link

    Code:
    SELECT tblStudent.*
    FROM tblStudent
    WHERE (((Len([tblStudent].[MathsClass]))<>(SELECT min(Len(Mathsclass)) AS Mathsgp FROM tblStudent AS Dupe      
        WHERE (Dupe.Surname =  tblStudent.Surname)                         
        AND (Dupe.FirstName =  tblStudent.FirstName))));
    Thanks
    Andy to all.
    (Is your topic sorted? Please mark your thread as solved)

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