I wrote What Is the Hardest Feature to Learn About SQL Server? not really knowing what answer to expect. So far no one topic has risen to the top of the list in the discussion. What about you, have you found some part of SQL really hard to learn?
I'm Andy Warren, currently a SQL Server trainer with End to End Training. Over the past few years I've been a developer, DBA, and IT Director. I was one of the original founders of SQLServerCentral.com and helped grow that community from zero to about 300k members before deciding to move on to other ventures.