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FLOAT [( precision )]
specifies an approximate numeric column. The column stores floating-point numbers and
designates from 1 through 54 bits of precision. The range is from +/-
2.2250738585072014e-308 through +/-1.7976931348623157e+308 stored in 8 bytes.
An IEEE FLOAT precision data type is stored as an IEEE DOUBLE, that is, in 8 bytes, with
the specified precision.
The default precision is 54.
REAL
specifies a 4-byte approximate numeric column. The column stores 32-bit floating-point
numbers with 23 bits of binary precision and 8 bits of exponent.
The minimum and maximum range is from +/- 1.17549435e-38 through +/ 3.40282347e+38.
DOUBLE PRECISION
specifies an 8-byte approximate numeric column.
The column stores 64-bit floating-point numbers and designates from 1 through 52 bits of
precision.
An IEEE DOUBLE PRECISION data type is stored in 8 bytes with 52 bits of binary precision
and 11 bits of exponent. The minimum and maximum range is from +/-
2.2250738585072014e-308 through +/-1.7976931348623157e+308.
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SQL Language Elements
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