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Microsoft Access Data Types

The following table shows the Microsoft Access data types, data types used to create tables, and ODBC SQL data types.

Microsoft Access data type

Data type (CREATETABLE)

ODBC SQL data type

BIGBINARY[1]

LONGBINARY

SQL_LONGVARBINARY

BINARY

BINARY

SQL_BINARY

BIT

BIT

SQL_BIT

COUNTER

COUNTER

SQL_INTEGER

CURRENCY

CURRENCY

SQL_NUMERIC

DATE/TIME

DATETIME

SQL_TIMESTAMP

GUID

GUID

SQL_GUID

LONG BINARY

LONGBINARY

SQL_LONGVARBINARY

LONG TEXT

LONGTEXT

SQL_LONGVARCHAR[2] SQL_WLONGVARCHAR[3]

MEMO

LONGTEXT

SQL_LONGVARCHAR[2] SQL_WLONGVARCHAR[3]

NUMBER (FieldSize= SINGLE)

SINGLE

SQL_REAL

NUMBER (FieldSize= DOUBLE)

DOUBLE

SQL_DOUBLE

NUMBER (FieldSize= BYTE)

UNSIGNED BYTE

SQL_TINYINT

NUMBER (FieldSize= INTEGER)

SHORT

SQL_SMALLINT

NUMBER (FieldSize= LONG INTEGER)

LONG

SQL_INTEGER

NUMERIC

NUMERIC

SQL_NUMERIC

OLE

LONGBINARY

SQL_LONGVARBINARY

TEXT

VARCHAR

SQL_VARCHAR[1] SQL_WVARCHAR[2]

VARBINARY

VARBINARY

SQL_VARBINARY

[1]   Access 4.0 applications only. Maximum length of 4000 bytes. Behavior similar to LONGBINARY.

[2]   ANSI applications only.

[3]   Unicode and Access 4.0 applications only.

Note Note

SQLGetTypeInfo returns ODBC data types. It will not return all Microsoft Access data types if more than one Microsoft Access type is mapped to the same ODBC SQL data type. All conversions in Appendix D of the ODBC Programmer's Reference are supported for the SQL data types listed in the previous table.

The following table shows limitations on Microsoft Access data types.

Data type

Description

BINARY, VARBINARY, and VARCHAR

Creating a BINARY, VARBINARY, or VARCHAR column of zero or unspecified length actually returns a 510-byte column.

BYTE

Even though a Microsoft Access NUMBER field with a FieldSize equal to BYTE is unsigned, a negative number can be inserted into the field when using the Microsoft Access driver.

CHAR, LONGVARCHAR, and VARCHAR

A character string literal can contain any ANSI character (1-255 decimal). Use two consecutive single quotation marks ('') to represent one single quotation mark (').

Procedures should be used to pass character data when using any special character in a character data type column.

DATE

Date values must be either delimited according to the ODBC canonical date format or delimited by the datetime delimiter ("#"). Otherwise, Microsoft Access will treat the value as an arithmetic expression and will not raise a warning or error.

For example, the date "March 5, 1996" must be represented as {d '1996-03-05'} or #03/05/1996#; otherwise, if only 03/05/1993 is submitted, Microsoft Access will evaluate this as 3 divided by 5 divided by 1996. This value rounds up to the integer 0, and since the zero day maps to 1899-12-31, this is the date used.

A pipe character (|) cannot be used in a date value, even if enclosed in back quotes.

GUID

Data type limited to Microsoft Access 4.0.

NUMERIC

Data type limited to Microsoft Access 4.0.

More limitations on data types can be found in Data Type Limitations.

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