i have a MySQL DB whit this tabel:
Id ColPoint CntDateTime Cnt1 Cnt2 Cntx..... Cnt32
1 1 2001-08-01 00:05:00 12 14 ....
2 1 2001-08-01 00:10:00 11 12 ....
3 1 2001-08-01 00:15:00 10 9 ....
4 1 2001-08-01 00:20:00 0 32 ....
5 1 2001-08-01 00:25:00 6 4 ....
6 1 2001-08-01 00:30:00 14 22 ....
7 1 2001-08-01 00:35:00 11 17 ....
.
.
x1 2 2001-08-01 00:05:00 32 4 ....
x2 2 2001-08-01 00:10:00 31 22 ....
x3 2 2001-08-01 00:15:00 30 19 ....
x4 2 2001-08-01 00:20:00 0 22 ....
x5 2 2001-08-01 00:25:00 26 14 ....
x6 2 2001-08-01 00:30:00 24 22 ....
x7 2 2001-08-01 00:35:00 1 17 ....
.
.
Ect.
I am collecting data from 8 collecting points whit 32 counters each
I have made a delphi program to show the data in bars or curves, but the
uses shal
have the opportunite to add and subtrach the datas
Exampel for user 1
ColPoint(Cnt1) +ColPoint5(Cnt3) -ColPoint2(Cnt11)
How can i build a sql-string that satisfied this need
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