The layout where x and y are dimensions eg
x
1 2
--------
y 1 | 3 4
2 | 5 6
might be represented the following fact table
xid yid data
1 1 3
2 1 4
1 2 5
2 2 6
If I added another dimension eg yy
then the following layout
x
1 2
yy y
1 1 3 4
2 5 6
2 1 7 8
2 9 10
might be represented by this extended fact table
yy xid yid data
1 1 1 3
1 2 1 4
1 1 2 5
1 2 2 6
+
2 1 1 7
2 2 1 8
2 1 2 9
2 2 2 10
That's all well and good until you decide you want to DROP the yy dimension.
How do you best organise table to represent a star schema type arrangement
so that you can easily INSERT/DELETE dimensions and the new data that
accompanies them.
Hope I've made myself clear.
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