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Identifier

Guidelines for Creating Identifiers

The guidelines for creating identifiers in the CSQL Interpreter are as follows:

  • An identifier must begin with a letter it must not begin with a number or a symbol.
  • It is not case-sensitive.
  • CUBRID keywords are not allowed.

< identifier>

:: = < identifier_letter> [ { < other_identifier>   } ]

< identifier_letter>

:: = < upper_case_letter>

  | < lower_case_letter>

< other_identifier>

:: = < identifier_letter>

  | < digit>

  | _

  | #

 

< digit>

:: = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

< upper_case_letter>

:: = A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P| Q | R | S | T | U | V | W | X | Y | Z

< lower_case_letter>

:: = a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p| q | r | s | t | u | v | w | x | y | z

Legal Identifiers

Beginning with a Letter

An identifier must begin with a letter. All other special characters except operator characters are allowed. The following are examples of legal identifiers.

a

a_b

ssn#

this_is_an_example_#

Enclosing in Double Quotes, Square Brackets, or Backtick Symbol

Identifiers or a reserved keywords shown as below are not allowed' however, if they are enclosed in in double quotes, square brackets, or backtick symbol, they are allowed as an exception. Especially, the double quotations can be used as a symbol enclosing identifiers when the ansi_quotes parameter is set to yes. If this value is set to no, double quotations are used as a symbol enclosing character strings. The followings are examples of legal identifiers.

" select"

" @lowcost"

" low cost"

" abc" " def"

[position]

Illegal Identifiers

Beginning with special characters or numbers

An identifier starting with a special character or a number is not allowed. As an exception, a underline (_) and a sharp symbol (#) are allowed for the first character.

_a

#ack

%nums

2fer

88abs

An identifier containing a space

An identifier that a space within characters is not allowed.

col1 t1

An identifier containing operator special characters 

An identifier which contains operator special characters (+, -, *, /, %, ||, !, < , > , =, |, ^, & , ~ ) is not allowed.

col+

col~

col& &