BSBI Distribution Database > message board

Searching for null monads

Any queries about using the BSBI database

Searching for null monads

by jdsh » Sun Jun 27, 2021 9:22 pm

I'd like to make a list of monads with no records for my county. This query ... 6381d81b6e should do it for a specific hectad (just using that for testing so that it runs faster), but the DDb doesn't return monads with zero taxa recorded. I may be missing something or it may not have been built in, or possibly not thought to be wanted.

Posts: 42
Joined: Sun Nov 25, 2012 11:41 pm
name: Jon Shanklin

Re: Searching for null monads

by AndyAmphlett » Sun Jul 04, 2021 6:01 pm


This query was raised some years ago - viewtopic.php?f=1&t=204&p=538&hilit=null#p538 - but the link to the DDb query doesn't seem to work any more. I have re-created it for Cambridgeshire (finding monads with no records since 2000) - ... 36fcfd8607. The null monads won't map though.

Posts: 408
Joined: Fri Nov 23, 2012 9:32 am
name: Andy Amphlett

Return to Help and support