Are SQL Developers and SQL Programmers same people? I have basic knowledge about SQL and want to improve it. plz help me?
No, I disagree - if you read Mike Gunderloy's excellent book Coder to Developer you'll understand a developer is a coder - but also a lot more.
A coder (= programmer) typically only writes code (possibly including unit tests) and that's about it. He usually gets a clear spec or task from someone else. A coder/programmer is more or less only concerned with writing, testing, and verifying code - nothing more.
A developer is a much more encompassing job description - a developer also deals with putting things into perspective, breaking up tasks into chunks that a coder can work on, he spends his time thinking about deployment and a lot more. A developer needs to know a lot more in his daily job than a coder.
Mike's book is good ... but if your going for a job the two terms SQL Programmer <-> SQL Developer are pretty much interchangable.
It just depends on what the hiring manager feels like calling the position.