>Hi All;
>
>I have a several hundreds thousands records in a table which I need to compare the closing value of each record with the previous one.
>I used the following code
>
>Option 1
>
>go top
>scan
> nVal1 = nClsVal
> skip
> nVal2 = nClsVal
> skip -1
> rest of code
>endscan
>
>too slow.
>
>option2
>select A.*, 000000000 as nRecNo from table1 to Cursor cTbl_1 readwrite
>then replace the nRecNO with Recno() all
>
>select A.*, 000000000 as nRecNo from table1 to Cursor cTbl_2 readwrite
>then replace the nRecNO with Recno()-1 all
>
>Finally
>select a.*, b.nClsVal as nPrvVal ;
>from cTbl_1 a, cTbl_2 b ;
>where a.nRecNo = b.nRecNo ;
>into cursor cTmp
>
>This is far more faster than option 1 but done in 3 sql select statement.
>
>Is there is any suggestion for a more elegent way
>
>Thanks all

use tableA in 0 again alias tablePrev
select tableA
set relation to recno()-1 into tablePrev

Cetin