Системы обработки информации - язык баз данных SQL


Формат


<literal> ::=

<character string literal>

| <numeric literal>

<character string literal> ::=

'<character representation>...'

<character representation> ::=

<nonquote character>

| <quote representation>

<nonquote character ::=

См. Синтаксическое правило 1.

<quote representation> ::=

''

<numeric literal> ::=

<exact numeric literal>

| <approximate numeric literal>

<exact numeric literal> ::=

[+|-] { <unsigned integer>[.<unsigned integer>]

| <unsigned integer>.

| .<unsigned integer> }

<approximate numeric literal> ::=

<mantissa>E<exponent>

<mantissa> ::= <exact numeric literal>

<exponent> ::= <signed integer>

<signed integer> ::= [+|-] <unsigned integer>

<unsigned integer> ::=

<digit>...




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