9.3.9 REAL

The JDBC type REAL represents a "single precision" floating point number that supports seven digits of mantissa.
The corresponding SQL type REAL is defined in SQL-92 and is widely, though not universally, supported by the major databases. The SQL-92 standard leaves the precision of REAL up to the implementation, but in practice all the major databases supporting REAL support a mantissa precision of at least seven digits.
The recommended Java mapping for the REAL type is as a Java float.