What's the difference between CCK Decimal and Float fields?

CCK's Number submodule provides two fields: decimal and float. Decimals are technical开发者_如何学Cly floats, so what is the difference between the two?

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Decimals are fixed point, not floating point. Decimal store exact numeric data values.

See: http://dev.mysql.com/doc/refman/5.0/en/numeric-types.html