Sorry,
I forgot to mention my table design, which is like this:
name 2001 2002 2003 2004 2005
-----------------------------------------------------------------
Afghanistan ....
Albania ....
(Yep, I know, bad table design.... :-)). I tried to change it to the
more common "id | year | value" format, but there were too many SQL
problems afterwards for the different queries/calculations we need to
have....)
So, the mentioned SQL unfortunately doesn't work in that case....
Stef
On Sep 27, 2007, at 1:52 PM, William Leite Araújo wrote:
If I understood your question, maybe it's you want:
SELECT min(<desired data>) FROM table1 JOIN table2 ON
(table1.data_field = table2.data_field);
2007/9/27, Stefan Schwarzer <[EMAIL PROTECTED] >:
Hi there,
my aim is to plot a line graph for a single country but for two or
three variables. Now, one could use two different y-axis (if there
are two data sets with different units); but it's not really the
right way to analyse data.
One should rather normalize them to a base year to enhance
comparisons. To achieve this, one would set the values for a specific
year to 1 (or 100) and put the other values of all variables in
relation to it.
Thus, taking two variables, say,
Fish Catch
- in Thousand Metric Tons
- data available for 1975 to 2005
and
Total Population
- in Million People
- data available for 1960 to 2005
Country is Kenya.
The "smallest common year" would be 1975. One needs thus to set the
values for that year to 1 (or 100), and calculate the other values of
the variables in respect to the needed factor.
Now the question is how to find that "smallest common year"
automatically, via SQL or PHP?
Can anyone give me a hint? Thanks for any help!
Stef
____________________________________________________________________
Stefan Schwarzer
Lean Back and Relax - Enjoy some Nature Photography :
http://photoblog.la-famille-schwarzer.de
Appetite for Global Dat a? UNEP GEP Data Portal:
http://geodata.grid.unep.ch
____________________________________________________________________
--
William Leite Araújo
Estudante de paternidade - 24a semana
