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How to exclude records from a list (SQL Help)

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  • How to exclude records from a list (SQL Help)

    This is more of an SQL question, but hoping for some guidance.

    I have an app with about 100 users. I want to create a notice board - where a user can put a notice up for others to see. I want to give each of my users the ability to mark a notice as READ so that it does not show up when they log in the next time.

    For the record I'm using SQL Server 14 via ZebraHost.

    So I have two tables:

    - this contains the basic notice. NoticeID the key

    - this table contains the NoticeID and the MemberID of the users who have clicked that they have read the notice.

    This is what I have in my SQL so far:

    SELECT Notices.NoticeID
    FROM Notices Notices
    LEFT OUTER JOIN Notice_read Notice_read
    ON Notices.NoticeID = Notice_read.NoticeID
    WHERE Notice_read.NoticeID IS NULL

    This works but I need to filter the Notice_read table for the MemberID. At this point if any member marks the notice read it will no longer appear.

    When I open the UX I will be passing in the MemberID with an argument ARGMEMBERID.

    So what i need to is only evaluate the Notices by the filtered Notices_read table and filter it for my logged in user.

    Any suggestions on how to structure this?

    Thanks in advance


  • #2
    Re: How to exclude records from a list (SQL Help)

    When does the NoticeRead record get created? If it gets created when the user clicks that it was read then you can use a Not In subquery.


    • #3
      Re: How to exclude records from a list (SQL Help)

      If MemberID is a column of Notices_read, I think all you need to do is to add a 2nd criteria (and maybe use INNER JOIN rather than LEFT OUTER JOIN?):

      SELECT Notices.NoticeID
      FROM Notices Notices
      LEFT OUTER JOIN Notice_read Notice_read
      ON Notices.NoticeID = Notice_read.NoticeID
      WHERE Notice_read.NoticeID IS NULL
      AND Notice_read.MemberID = :ARGMEMBERID


      • #4
        Re: How to exclude records from a list (SQL Help)

        The code below should work.
        I shortened the aliases just because it made things easier for me.
        I used <MemberID> because you somehow need to use that value.
        The option to use it as an argument is still there, just up to you on your

        SELECT N.NoticeID 
        FROM Notices N
        LEFT OUTER JOIN Notices_read R ON N.NoticeID = R.NoticeID 
        where <MemberID> not in (
        select q.MemberID
        from Notices_read q
        where q.noticeID = N.NoticeID and q.MemberID = <MemberID>
        Gregg is a great site to test and share sql code


        • #5
          Re: How to exclude records from a list (SQL Help)


          The Notice_Read record would be created when the user clicks on the record in the list - This would insert the NoticeID, UserID and Timestamp into the Notice_Read table. So when my user logs on the messages that they have read will be in the Notice_Read table.


          • #6
            Re: How to exclude records from a list (SQL Help)

            Try what Gregg wrote. That's the not in sub-query. That will do the trick.