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Change a column's data type or size

You can use Table Designer to change existing columns in a table. Before converting from one data type to another, consider how the change will affect your entire database. When you select a data type, length is defined automatically. You can increase or decrease the length property only for a column with a binary or text data types. For columns with other data types, the length is derived from the data type and cannot be changed. If the new specified length is smaller than the original column length, all values in the column that exceed the new length are truncated without any warning. It is not possible to change the length of a column defined with a PRIMARY KEY or FOREIGN KEY constraint.

Related Topics:

How to change columns in an existing table

Adding, deleting, modifying, and renaming columns

Autonumbering and identifier columns

Column Data Types

About tables

Indexes and primary keys


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