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Characters are the fundamental building blocks of the SQL language. The user can compose names, phrases, expressions, literals, and other higher-level constructs with them. Upper and lower case letters, spaces, digits, and new line markers are all in the SQL character set, as are a variety of special symbols.
alpha ::= A..Z | a..z
Note: A..Z means any character from A to Z.
digit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9| 0...9
digit ::= 0...9
special-character ::=
A special character is any character in the character set of a server other than a digit or an alpha.
<blank> ::=
<double quote> ::= "
<percent> ::= %
<ampersand> ::= &
<quote> ::= '
<left paren> ::= (
<right paren> ::= )
<asterisk> ::= *
<plus sign> ::= +
<minus sign> ::= -
<period> ::= .
<solidus> ::= /
<colon> ::= :
<semi-colon> ::= ;
<less than operator> ::= <
<equals operator> ::= =
<greater than> ::= >
<question mark> ::= ?
<left bracket> ::= [
<right bracket> ::= ]
<underscore> ::= __
<vertical bar > ::= |
<caret> ::= ^
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