Topic: Storing 'visible' columns for a model
I have a model measurements, with fields A,B,C,...
Now the user can generate a statistic image for this model.
But, the user can select which columns he wants to display in the image,
and this should be stored.
So I have to store something like true/false (visible) for each column.
How can I do this in an efficient way?
A table with fields user_id and column_name looks bad, since I have to compare
the column names when reading ..