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Append Most recent Date

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  • Append Most recent Date

    Hello world, I need help writing a filter for an append operation. I have a table that holds class schedules for students, this table has many entries for the same student. What I would like to do is append from this table to an empty table with the exact same structure, the most recent class date for each ssn in the table (assuring that only one record per ssn is appended) the two fields that I am using is for the filter is START_DATE and SSN.

    The past year I've been working strictly on the web side of alpha using a sql back end so im a bit of at a loss when trying to write this filter, I know how to write this in sql but I guess I've forgotten how to handle this in dbf for alpha. Can anyone give me hand, it would be very much appreciated.

  • #2
    Re: Append Most recent Date

    What I find handy is to open a browse and write a query by expression to get what I want.

    I then save the query and use it (or the code from it) in the operation.
    Al Buchholz
    Bookwood Systems, LTD
    Weekly QReportBuilder Webinars Thursday 1 pm CST

    Occam's Razor - KISS
    Normalize till it hurts - De-normalize till it works.
    Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
    When we triage a problem it is much easier to read sample systems than to read a mind.
    "Make it as simple as possible, but not simpler."
    Albert Einstein

    Comment


    • #3
      Re: Append Most recent Date

      I made an attempt at it using the default browse for my table hoping that the Genie would help to create a filter but I'm still not sure how to write it.

      Comment


      • #4
        Re: Append Most recent Date

        The following should work. I personally would make it into a function (UDF). This only works because you stated that the source and target table are identical - ie. same fields in the same order. An append would be faster but maybe that isn't as important.

        Code:
        'set the table names
        	dim vsource_tbl as C="schedules"
        	dim vtarget_tbl as C="target"
        	
        'acquire a list of students social security number
        	dim vLssn as C
        	vLssn=word_unique(table.external_record_content_get(vsource_tbl,"ssn"),crlf())
        
        'get the record count for the wait dialog
        	dim vnrecs as N
        	vnrecs=line_count(vLssn)
        
        'get pointer to tables and open the tables
        	dim ts as p
        	dim tt as p
        	
        	ts=table.open(vsource_tbl)
        	tt=table.open(vtarget_tbl)
        	
        	dim cycle as N=0
        	DIM GLOBAL pDlg1 as {waitdialog}
        	pDlg1.Set_Title("Please Wait")
        	pDlg1.Create(1,"Percent")
        	
        'loop through the ssn list, filter the source table to the ssn in date order, 
        'get the last date record and write that record to the target table
        	dim vdata as B				'record data variable
        	dim vssn_now as C			'loop iteration ssn value
        	
        	for each foo in vLssn
        		vssn_now=alltrim(foo)
        		
        		'wait dialog report
        		cycle=cycle+1
        		pDlg1.Set_Message(vssn_now)
        		pDlg1.Set_Bottom_Message(str(cycle)+"  of  "+str(vnrecs))
        		pDlg1.Set_Percent(Var->cycle,Var->vnrecs)		
        		
        		'filter the source table to the now ssn in start_date order and get the last date record into variable
        		xs=ts.order("start_date","ssn="+quote(vssn_now))
        		if xs.records_get()>0
        			ts.fetch_last()
        			vdata=ts.record_data_get()
        			
        			'write to the target table
        			tt.enter_begin()
        			    tt.record_data_set(vdata)
        			tt.enter_end(.t.)
        		end if
        		
        	'get next ssn
        	next
        	
        'close the tables and the wait dialog at the end of the loop
        	ts.close()
        	tt.close()
        	pDlg1.close()
        	
        'report complete
        	msgbox("The last dates for each student have been written to the "+vtarget_tbl+" table.")
        Mike W
        __________________________
        "I rebel in at least small things to express to the world that I have not completely surrendered"

        Comment


        • #5
          Re: Append Most recent Date

          Or create a summary operation that groups on Ssn and max on start_date.
          Al Buchholz
          Bookwood Systems, LTD
          Weekly QReportBuilder Webinars Thursday 1 pm CST

          Occam's Razor - KISS
          Normalize till it hurts - De-normalize till it works.
          Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
          When we triage a problem it is much easier to read sample systems than to read a mind.
          "Make it as simple as possible, but not simpler."
          Albert Einstein

          Comment


          • #6
            Re: Append Most recent Date

            Thanks for the reply, this code looks loaded but thank you for adding the comments, its very easy to read.

            Comment


            • #7
              Re: Append Most recent Date

              Originally posted by Al Buchholz View Post
              Or create a summary operation that groups on Ssn and max on start_date.
              This was much easier to accomplish, thank you for the push in the right direction. It worked perfectly.

              Comment


              • #8
                Re: Append Most recent Date

                Now create a set with the summary table as the parent that links to the original table with the ssn and max date.

                Then you have all the records to append (or copy) to the new table.
                Al Buchholz
                Bookwood Systems, LTD
                Weekly QReportBuilder Webinars Thursday 1 pm CST

                Occam's Razor - KISS
                Normalize till it hurts - De-normalize till it works.
                Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
                When we triage a problem it is much easier to read sample systems than to read a mind.
                "Make it as simple as possible, but not simpler."
                Albert Einstein

                Comment

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