Bit srting manipulation question
Bit srting manipulation question
От:
Ericson Smith <eric@did-it.com>
Дата:
Hi all, I'm trying to code a problem where a set of options can be expressed in a data column like "10111011", a bit string. Each position is atomic and represents a certain setting within the set, thus: "00100000" would return TRUE if OR'd with "10111011", since the 3'rd position matches in both sets. While I could manually retrieve N records and iterate through them in whatever programming language (or possibly a postgresql function), is there a way I could natively do this in a WHERE clause in my query? Looking through the idocs, I could not immediately find a way around this issue. Any pointers to documentation (or perhaps another way to implement this issue) would be very helpful. Regards Ericson Smith eric@did-it.com
Re: Bit srting manipulation question
От:
Bruno Wolff III <bruno@wolff.to>
Дата:
On Tue, Oct 29, 2002 at 20:11:27 -0500, Ericson Smith wrote: > > Each position is atomic and represents a certain setting within the set, > thus: "00100000" would return TRUE if OR'd with "10111011", since the > 3'rd position matches in both sets. > > While I could manually retrieve N records and iterate through them in > whatever programming language (or possibly a postgresql function), is > there a way I could natively do this in a WHERE clause in my query? If you can store them as integers then you can use the binary and and binary or operators to do this kind of thing.
