Data types concepts ; sql
snippet from reference
4 Concepts 4.1 Data types A data type is a set of representable values. The logical representation of a value is a <literal>. The physical representation of a value is implementation-dependent.
A value is primitive in that it has no logical subdivision within this International Standard. A value is a null value or a non-null value.
reference
Carnegie Mellon University, Computer Club, sql, sql1992.txt
at 4.1 Data types
note
- SQL-92 is obsoleted
- check yourself latest SQL-2011
- latest is in ISO/IEC 9075 and non-free