You may not use a reserved word as the name of a field.
Many popular words are used by the system; some words to avoid...
Having a "house-rule" can prevent such problems. Some developers insist that field names begin with fld for example fldSurname. Most of us have enough meaningless junk in their lives already; we don't need this kind of self imposed tyranny.
|Specific to Oracle|
|You may not use DATE or SIZE or INDEX or NUMBER or ORDER or SIZE as a field name.|