Du glemte at sige, hvilken version af Access du bruger, men her er nogle generelle ting vedr. datatyper BYTE og BIT.
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
Microsoft Access data type : BIGBINARY[1] LONGBINARY SQL_LONGVARBINARY
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