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The data type of a database field determines the possible values that that field can hold. When you create a field in MS Access and assign it the Date/Time data type, than that field can only hold date and time values like 04-11-2008 17:51.

When you assign the Number data type and set the field length to "Long integer" that field can only hold whole numbers.

Text, Number and Date are the most common data types in Access. A more exotic data type is the Attachment data type, which can hold files or the Calculated data type which can hold a formula that calculates a result based on values from other fields.

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