value_spec

<value_spec> ::=
  <literal>
| <parameter_spec>
| NULL 
| USER 
| USERGROUP 
| SYSDBA 
| CURRENT_SCHEMA
| UID 
| [<schema_name>.]<sequence_name>.NEXTVAL 
| [<schema_name>.]<sequence_name>.CURRVAL
| <table_name>.CURRVAL
| DATE
| TIME
| TIMESTAMP
| UTCDATE
| TIMEZONE
| UTCDIFF
| TRUE
| FALSE
| TRANSACTION

Referenced by:

<extended_value_spec>, <factor>, <key_spec>