Identifiers 
Identifiers are used to identify names of database objects, as there are table names, column names, display names for columns and table aliases. An identifier may be specified in a SQL statement either as a delimited identifier (an identifier enclosed in double quotes '"') or as a regular identifier (not enclosed in double quotes).
Generally, names of
database catalog objects like column names or table names are case sensitive.
If the name of a database object contains lower case letters or if it is equal
to a reserved keyword, a
delimited identifier has to be used to refer to it. Otherwise a regular
identifier is suitable. The names of all catalog objects created with the
Table
Editor can be referred to with regular identifiers.
Syntax
|
<identifier> ::= <delimited identifier> | <regular identifier> |