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.
Syntax
<token> ::= <regular_token> | <delimiter_token>
regular_token, delimiter_tokenSELECT * FROM reservation
ALTER TABLE reservation DROP FOREIGN KEY customer_reservation
Explanation
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.