You're grouping on field Dtyme from the cursor not on the expression. In VFP SQL Statement a field oways wins over alias in GROUP or SORT by
Change the alias so it doesn't match the field name.

>
>I have a datalogger that 'sends me' the readings in a .CSV file, and this is how I convert it to a FoxPro table/cursor with the intention of using FoxCharts to display the results.
>
>

>CREATE CURSOR CPdata ( ;
>	RType C(24), ;
>	Dtyme C(20), ;
>	MilliSec N(12,4), ;
>	ExcelTyme N(16,8), ;
>	DCreading N(16,7), ;
>	DCunit C(2), ;
>	ACreading N(16,7), ;
>	ACunit C(2), ;
>	TempRead N(6,1), ;
>	TempUnit C(2), ;
>	BattPot N(4,1), ;
>	GPSLat N(12,8), ;
>	GPSLon N(12,8), ;
>	GPSSat N(4), ;
>	CPNote C(48) )
>SELECT CPdata
>cCPdataFyle = [C:\TEMP\UDL1_DATA\TESTDATA.CSV]
>APPEND FROM (cCPdataFyle)  TYPE CSV
>BROWSE  TITLE cCPdataFyle
>

>This part of the code works just as I expect it should.
>The challenge is the quantity of data that is being saved and therefore must be displayed on the chart - 1 reading per second. 3600 readings per hour, 86400 per day. I'm trying to distill the data by averaging 10 readings into 1 number for display purposes using a SQL select:
>

>SELECT LEFT(Dtyme,18) AS Dtyme, AVG(DCreading) AS DCreading, ;
>	SPACE(10) AS cDate, SPACE(8) AS cHourMin ;
>FROM CPdata  WHERE RType=[DC] ;
>	GROUP BY Dtyme, cDate, cHourMin  ORDER BY dTyme ;
>	INTO CURSOR CPchart  READWRITE
>BROWSE  TITLE [Data to Chart]
>

>Problem: No grouping occurs (see attached screenshot).
>
>I'm missing something..... your assistance is appreciated.