A character set or token comprises a series of characters that are combined to form a lexical unit. A distinction is made between regular and delimiter tokens.
<token> ::= <regular token> | <delimiter token>
regular_token, delimiter_token
SELECT * FROM reservation
ALTER TABLE reservation DROP FOREIGN KEY
customer_reservation
Each token can be followed by any number of blanks. Each regular_token must be followed by a delimiter_token or a blank.
Double quotes within a special identifier are represented by two consecutive quotes.