A character set (token) comprises a series of characters that are combined to form a lexical unit. A distinction is made between regular (regular_token) and delimiter (delimiter_token) tokens.
Syntax
<token> ::= <regular_token> | <delimiter_token> <regular_token> ::= <literal> | <keyword> | <identifier> | <parameter_name> <delimiter_token> ::= <vertical_slash> | , | . | + | - | * | / | < | > | <> | != | = | <= | >= | ~= <! for computers with ASCII code !> | ~< <! for computers with ASCII code !> | ~> <! for computers with ASCII code !> <vertical_slash> ::= |
Example
SELECT * FROM reservation
ALTER TABLE reservation DROP FOREIGN KEY customer_reservation
'Reisen10'
Each token can be followed by any number of blanks. Each regular token (regular_token) must be followed by a delimiter token (delimiter_token) or a blank.
Quotation marks within a special identifier are represented by two consecutive quotation marks.