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Character Set (token)Locate this document in the navigation structure

Use

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.

Structure
	
<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'

Explanation

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.

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