This article explains how to modify or change the data type applied to a table field in an Access database. In this article. Understand data types. Change data types. Restrictions on changing …

Use an existing field from another table, the data type is already defined in the template or in the other table. Enter data in a blank column (or field), Access assigns a data type to the field …

Access can automatically create a primary key field for you when you create a table, or you can specify the fields that you want to use as the primary key. This article explains how and why to …

Set or change Short Text field properties. You can use Datasheet View to set a subset of field properties, such as Is Required or Unique, but use Design View to set all available properties, …

Important: In an Access web app, you need to add a new field and immediately set it to use the Lookup Data type. If you try to change an existing field to the Lookup Data type, you won't be …

Overview of data types in Access desktop databases, and detailed data type reference, including Short Text, Long Text, and Date/Time.

When you use the Date/Time data type in Microsoft Access, you can keep the default formats, apply a predefined format, or create a custom format.

Use the following procedure to change a field's data type. On the Ribbon, click the Table Fields tab. In the Data Type list, in the Formatting group, select the data type that you want. What …

Use ALTER COLUMN to change the data type of an existing field. You specify the field name, the new data type, and an optional size for Text and Binary fields. For example, the following …

Change the data type of a field. When you add a field by typing data into it, Access sets the field’s data type based on its contents. View the data type on the Fields tab, under Data Type. To …