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I think you should do two things: Set the column to NOT NULL to force the input of a value. Use a trigger to validate the values. Within the trigger you can cancel the operation if the desired column does not fulfill a required condition (for example, having zero-length).

The data type is a guideline for SQL to understand what type of data is expected inside of each column, and it also identifies how SQL will interact with the stored data. Note: Data types might have different names in different database. And even if the name is the same, the size and other details may be different!

A distinctive sign (“*” symbol, “mandatory” mention, etc.) must be provided in the label of each mandatory field. If a symbol is used to declare mandatory fields, a statement placed at the beginning of the form must indicate that the symbol stands for a mandatory field.

After inserting a form field, click the Properties button to get its properties dialog, which is different from the one for content controls. Put the field's name in the "Bookmark" box -- that name is what the macro will use to identify the field. In the Exit dropdown, select the name of the macro (MustFillIn).

Make a field mandatory Right-click the field's label in the form and select Configure Dictionary. In the Dictionary form, select the Mandatory check box. Click Update. The next time the form is opened, a field status indicator appears next to the field label, indicating that a value is mandatory.

The SQL Select Statement: The SELECT statement indicates that you which to query and retrieve information from a database. ... The FROM clause is the only required clause in the SELECT statement. ... The WHERE clause limits the results to those records (or rows) that meet some particular conditions (optional).

Set the field's Required property to Yes You can do this by opening the table in Design view. This method is easy and a good choice if you only want to change one field one time. Use a data-definition query that creates a non-null index on the field You can do this by using SQL view.