... table, as it would ensure that only feasible postcodes are typed in. It is simple to create; you type a code into the specified text box, and it is automatically created. In this code, an "L" represents a letter and a "9" represents a number. So for a postcode, the code would read "LL00 9LL"; two letters, up to two numbers, one number then two letters to finish. Length Check This limits the number of characters that can be typed into a field. It is most useful for a field with a specific number of characters like telephone number. A telephone number always contains the same number of characters, so this facility allows you to ensure that no extra numbers are accidentally typed in. It can also be used for other fields without a specific number of characters. For example, it would be extremely unusual for a person to have more than ...

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