Системы обработки информации - язык баз данных SQL


Формат


<data type> ::=

<character string type>

| <exact numeric type>

| <approximate numeric type>

<character string type> ::=

CHARACTER [(<lenght>)]

| CHAR [(<lenght>)]

<exact numeric type> ::=

NUMERIC [(<precision> [,<scale>])]

| DECIMAL [(<precision> [,<scale>])]

| DEC [(<precision> [,<scale>])]

| INTEGER

| INT

| SMALLINT

<approximate numeric type> ::=

FLOAT [(<precision>)]

| REAL

| DOUBLE PRECISION

<lenght> ::= <unsigned integer>

<precision> ::= <unsigned integer>

<scale> ::= <unsigned integer>




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