I am porting Informix SQL calls to SQL Server and am pretty new to SQL in general. Could anyone tell me what the question mark in the following SELECT statement means?

select sl.tsn
from taxonomic_units tu,wrk_synonym_links sl
where tu.tsn = sl.tsn
and usage = ?

usage is a field name in the taxonamic units table (whoever is answering this question probably knew that though).

Thanks!

Here is what you need:

http://database.sarang.net/database/...fm.html#133070

Thank you sooo much! much appreciated

I'm glad I was able to help .