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In SQL, you would write that as: In databases, a "boolean" can have three values, not just two.

A field with a NULL value is a field with no value.

Query criteria help you zero in on specific items in an Access database.

If an item matches all the criteria you enter, it appears in the query results.

By selecting data first, you can verify that you’re updating the records you want before you actually change any data.

Tip: Back up your database before you run an update query.

To add new records to a database you use an append query, and to delete whole records from a database you use a delete query.

For example, = "Chicago" is an expression that Access can compare to values in a text field in a query.

If the value for that field in a given record is "Chicago", Access includes the record in the query results.

If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field. Note: It is very important to understand that a NULL value is different from a zero value or a field that contains spaces.

A field with a NULL value is one that has been left blank during record creation!