What does ? mean in sql

Question

I have seen it in urls eg.
http://www.aradergalleries.com/catgallery.php?id=2
this site uses an sql dbms

Answer 1

the ? you see has nothing to do with sql its a html argument seperator the first is ? all others after that use &

Answer 2

where serve para buscar uma informação específica. Limitar os resultados obtidos

Answer 3

Oh thx

Answer 4

Im not sure nathan is correct. The ? could refer to dynamic parameters passed in as arguments.
For example if you're getting an id from a url it will show
"WHERE ID = ?"