Search for those Contacts Missing an Email Address

By now, you should have a basic understanding on searching through your data. So let's do something a bit more complex. 

Say you want only those contacts that are MISSING an email addresses. 

How Many Females vs Males?

Whether you want to invite females in your database to a Women's Empowerment Conference or ask all males to fill out a survey. If you are running a political campaign you may want to know how many Female Voters there are compared to Male Voters.