After Designing database--->Connection to database--->Data entered-->Data stored in database.My doubt is in which format data is viewed on the screen.(XML OR EXCEL OR PDF)

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This doesn't make much sense. It depends on the software or tech you're running. A web app, will usually display data in html format. VB for example may use crystal reports. You can export data to a filetype (csv, pdf, xml etc) too.

Depends what you want/need.

I want to become a Database programmer.What are the requirement for a Database programmer.I had only knowledge on SQL only.I want to know about the workflow(life cycle of database system development) of the database companies.

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