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SQL Server: datatype float

float(n) is an approximate numerical data type.
The optional n (which must be between 1 and 53) specifies the number of mantissa-bits. If not specified, n defaults to 53.
real is a synonym for float(24).
double precision is a synonym for float(53).
For n between 1 and 24, float(n) requires 4 bytes for storage. For n between 25 and 53, it requires 8 bytes of storage.

See also

IEEE-754 (Floating Point Arithmetic - float/double etc)
data types

Index

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