Special identifier ( special_identifier). A special identifier must be entered in double quotation marks if it is to be used as an identifier.
<special_identifier> ::= <special_identifier_character>...
<special_identifier_character> ::= any characters, that can be linked in any sequence
Special identifiers are always used as specified in the database; that is upper and lower case characters are taken into account. Special identifiers are case-sensitive.
If the name of a database object is to contain lowercase letters, special characters, reserved keywords (reserved_key_word), or blanks, the identifier must be specified as a special identifier (enclosed in double quotation marks).
“ADD”, “Example_1”