Thanks for the question - good reminder of the basics.
It appears that quite a few here needed reminding of the differences - 40% wrong at the moment.
I wonder how much higher it would have been if you asked which are logged in the question :w00t:
-------------------------------Posting Data Etiquette - Jeff Moden [/url]Smart way to ask a question
There are naive questions, tedious questions, ill-phrased questions, questions put after inadequate self-criticism. But every question is a cry to understand (the world). There is no such thing as a dumb question. ― Carl Sagan
I would never join a club that would allow me as a member - Groucho Marx