Re: Table design - unknown number of column

On fim, 2006-11-09 at 10:56 +0100, Alban Hertroys wrote:
> Richard Ollier wrote:
> > For a project I have a table containing products and flags.
> > The columns of this table are of 2 kinds :
> > - Not null data (id, column1, column2)
> > - Flags (100 different flags set to 1 or 0)
> >
> > Over the time the number of flag will increase from 100 to 200 or more.
>
> Having 200 flags as 200 fields... Writing queries on that is going to be
> painful.
>
> I would probably look at bitwise operations, although 200 bits is quite
> a bit larger than a bigint. Maybe an array of ints would work...

maybe the BIT VARYING datatype could be useful.

http://www.postgresql.org/docs/8.1/interactive/datatype-bit.html

gnari