Most of the fastest 100 computers in the world can execute 5 Trillion (5,000,000,000,000) floating point operations per second (FLOPS)
The new Fastest Supercomputer, the IBM Roadrunner, just achieved 1 PetaFLOPS (1 quadrillion - 1,000,000,000,000,000 computations per second in early June, 2008)
The actual measured speed was 1.047 PetaFLOPS.
However, it is still being built - and should achieve 1.7 PetaFLOPS by the end of 2008.
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No
They used a computer at the University of Tokyo.
Yes you can. You can create queries that do calculations. You can write code for programs to do calculations in a database. Doing calculations is a significant element of what you do with a database, so yes you can do them within a database.
No, it is not.
Yes. A graphing calculator has lots of options for mathematical calculations, but in addition, it has a relatively large screen, and options to graph functions.