The DOUBLE data type is used to store double-precision floating-point numbers.
DOUBLE [ PRECISION ]
The DOUBLE data type holds a double-precision floating point number. An approximate numeric data type, it is subject to rounding errors after arithmetic operations. The approximate nature of DOUBLE values means that queries using equalities should generally be avoided when comparing DOUBLE values.
DOUBLE values require 8 bytes of storage.
The value range is 2.22507385850721e-308 to 1.79769313486231e+308. Values held as DOUBLE are accurate to 15 significant digits, but may be subject to round-off error beyond the fifteenth digit.
SQL/2003 Compatible with SQL/2003.