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I can't show all the data points when creating a query from several tables

  1. #1
    Aladdin is offline Novice
    Windows 7 32bit Access 2010 32bit
    Join Date
    Oct 2019
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    2

    I can't show all the data points when creating a query from several tables

    Good day to all,



    I'm working on data concerning road traffic accidents for a certain period. The attributes (variables) of each data point (each accident) can be found in 5 different tables, and the final table I want to achieve would have each data point (accident ID) together with its variables from all the tables, and to do so I have linked my tables using the relationship shown in the attached screenshot. I have created a bridge table to account for the duplicated values (as each accident has many components such as vehicle 1 and vehicle 2 and therefore the Accident ID would be duplicated in tables) and then using a one-to-many relationship, I linked the tables through the variable "ID_Accidente" and the join type I chose was "Include ALL records from 'Table Name' and only those records from 'BridgeTable'(which contains the non duplicated accidents ID's) where the joined fields are equal, but what I keep getting in the query is only the accidents ID's for which there is a value in each row (for example, not all accidents include pedestrians so data points with no pedestrians won't show in the final query). Can anyone suggest a solution so I can show each accident ID with all the attributes from all the tables?

    Thank you in advance!
    Click image for larger version. 

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  2. #2
    davegri is offline Excess Access
    Windows 10 Access 2016
    Join Date
    May 2012
    Location
    Denver
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    2,050
    If I understand the problem correctly,
    You also want to modify the linkages shown to "Include all records from IDPivotTable and only those from Drivers_2016" and so on.
    You probably want to do this just in a query because you want to maintain the database's relational integrity in the Relationships diagram as shown.

  3. #3
    Ajax is offline VIP
    Windows 10 Access 2010 32bit
    Join Date
    Mar 2015
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    7,554
    I agree with Davegri - select the other option

  4. #4
    ssanfu is offline Master of Nothing
    Windows 7 32bit Access 2010 32bit
    Join Date
    Sep 2010
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    Anchorage, Alaska, USA
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    8,445
    You might consider reworking your design. It looks like you have linked the tables on text fields instead of number fields.
    See Microsoft Access Tables: Primary Key Tips and Techniques



    I didn't add all of the fields in your image, but consider this:
    Click image for larger version. 

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    I tend to have a left to right arrangement for viewing relationships; it is easier for me to see the flow of data.
    Click image for larger version. 

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    A field with the suffix of "ID_PK" is a primary key field that is an Autonumber type.
    A field with the suffix of "ID_FK" is a foreign key field that is a Long Integer type.

    Also notice that the YEAR has been moved into the table "tblAccidentes" - now you can have multiple years of accidents in each table - just filter on the year.




    Good luck with your project.....
    HTH
    -----
    Steve
    --------------------------------
    "Veni, Vidi, Velcro"
    (I came; I saw; I stuck around.)

  5. #5
    Aladdin is offline Novice
    Windows 7 32bit Access 2010 32bit
    Join Date
    Oct 2019
    Posts
    2
    Thank you all for your very beneficial comments and replies, I highly appreciate it!

Please reply to this thread with any new information or opinions.

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