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Searching records by Date

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  • Searching records by Date

    HI

    I am wondering if or what methods can be used in Alpha to pull the latest 'Job' from a table for a given customer where there are many instances of jobs for that same customer. Records will not only be pulled by latest date but also by other fields too. In Access I can use the MAX() function in a Query and as long as I include the Customer ID etc then it will return the Latest Record in the Jobs table for that customer.

    Does Alpha have a similiar function please?

    Thanks for your help

    Mike

  • #2
    Re: Searching records by Date

    LookupD()????

    Comment


    • #3
      Re: Searching records by Date

      HI and thanks for the reply. I had a bit of a read on LookupD() and it looks like a function to pull a date from another table in a query as far as I can tell? I may be incorrect as I was just reading briefly from Susan Bush's A5 Functions book. I thought you would have to specify a date with that, as opposed to just 'asking' for the latest date?

      Cheers
      Mike

      Comment


      • #4
        Re: Searching records by Date

        Mike

        Take a look at these two functions

        Tablemax()

        http://wiki.alphasoftware.com/TABLEMAX+Function

        Dbmax()

        http://wiki.alphasoftware.com/DBMAX+Function

        difference is that Dbmax() requires an index -

        Tablemax() does not just a table filter and the field data to return

        Tom Baker

        Comment


        • #5
          Re: Searching records by Date

          Thanks Tom

          The Tablemax() looks like it may do the job, I'll just have to check that it does not require a specific Date to look for.

          i.e. in the example on the link you posted it uses for an example:
          tablemax("PURCHASE.DBF", ".T.", "COST") -> 18500.00

          Which I guess is searching for values in the COST field of greater than 18500.
          So I'll have to see if something like:

          Tablemax("Jobs.dbf", ".T.", "Date")

          works. Then combine it within a loop so that it looks through the table and first finds the latest job on each item of equipment where the field 'Full_Test_Done' is True. Then print out a report basically showing what items are over 12 months since their last full test.

          Cheers
          Mike

          Comment


          • #6
            Re: Searching records by Date

            Mike, if you find performance slows unacceptably consider writing a custom function. Tablemax will open, filter, fetch, retrieve, and close each time it's called. Depending on the size of the table and the responsiveness of your network this sequence may be pretty slow.

            Comment


            • #7
              Re: Searching records by Date

              Thanks Tom it is a pretty big table so I'll see how I go and come back here if I need more help.

              Mike

              Comment


              • #8
                Re: Searching records by Date

                Originally posted by ZaphodBBB View Post
                HI

                I am wondering if or what methods can be used in Alpha to pull the latest 'Job' from a table for a given customer where there are many instances of jobs for that same customer. Records will not only be pulled by latest date but also by other fields too. In Access I can use the MAX() function in a Query and as long as I include the Customer ID etc then it will return the Latest Record in the Jobs table for that customer.

                Does Alpha have a similiar function please?

                Thanks for your help

                Mike
                Mike,
                I would use a set with Customer as parent and Orders as child.
                Child would be sort by invert(cdate(documentdate))
                On my form I would add a small browse just with a few childrecords.
                If wanted you can add another browse sorted on another item e.g. invert(jobnr) or so.
                When you retrieve the customer, you see at a glance his history.
                My 2 cents
                Most things are simple but unfortunately only after the first time

                Comment


                • #9
                  Re: Searching records by Date

                  Hi Ton

                  Thanks for your reply, unfortunately I dont quite follow you yet. I keep coming back to A5 to try and learn it, get frustrated, carry on with access, look at what I have done in A5 (which I like the appearance of more than anything else!!) etc.

                  I do not have an Orders table to do a Set with? Also what do you mean by invert? Turn upside down or switch? I have tables for Customers, Jobs, Equipment, Equipment Type, Job Type, etc.

                  Thanks for your time all the same.

                  Comment


                  • #10
                    Re: Searching records by Date

                    Hi Mike,

                    Originally posted by ZaphodBBB View Post
                    I keep coming back to A5 to try and learn it, get frustrated, carry on with access, look at what I have done in A5 (which I like the appearance of more than anything else!!) etc.
                    We call that the learning curve. We all followed that track. So go on!

                    I do not have an Orders table to do a Set with? Also what do you mean by invert? Turn upside down or switch? I have tables for Customers, Jobs, Equipment, Equipment Type, Job Type, etc.
                    In a nutshell I repeat my idea and hope its more clear to you.
                    As I suppose that jobs have a relation with custumers, Try to find out how to make a set on the Customers table as parent with the Jobstable as child.
                    If you make an index for the Jobstable take the datefield and sort it in decending order. (=last date is first).
                    See attachment: Childsettings in the Set
                    Open the default form of that Set and you will see custumer data and also a browse with jobinfo sorted
                    You can customize that form and save it with a smaller browse by deleting the fields out of the browse (NOT out of the table) and depending of the space you have/need limit the number of rows.
                    Result must be that when you retrieve the customer, you see at a glance on a few lines the newest history.
                    See attachment: Customerform with a browse. where donateur = customer and documentfieldname can be your Jobfieldname.

                    Mike, give it a try if this is what you need/can use (but Backup1 Backup2 Backup3 Backup4 and testenvironment)!

                    Good luck

                    Ton
                    Most things are simple but unfortunately only after the first time

                    Comment


                    • #11
                      Re: Searching records by Date

                      Hi Ton

                      Thanks for your help aand the example files. Sorry I have not replied earlier I did not receive an email that there were any more replies so I have not visited back to the message board until today. I will try as you suggest and see how I go. Yes there is a customers table.
                      Just so I give the clearest idea as to what I am doing. There is the jobs table with many jobs for each item of equipment. Some of those jobs will be "Full_Test_Done" = .T.

                      So every item Must have at least one Full Test per year. So I want to prepare a report so that a list will be printed of when the last 'Full Test' was done on each item. So need to look through all jobs, look at each item of equipment and see if and when there was the Full Test Done and get the most recent then add that to the report.

                      The report will have Equipment Number of the item, description of the item, what department it belongs to and when the last Full Test done, and when nest due.

                      Cheers
                      Mike

                      Comment

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