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To further enhance your filtering capabilities, you can use Boolean algebra combined with the operators we have used so far. Besides the logical operators we know already, Boolean algebra adds extra operators used to concatenate expression.
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Using Data Types
Microsoft Access / Functions and Expressions
A number is a digit (0, 1, 2, 3, 4, 5, 6, 7, 8, or 9), a combination of digits, or a combination of one or more digits, a separator, and one or more digits. Microsoft Access provides three techniques or categories of numbers. These should be applied appropriately to make your database as effective as possible. To specify that a column will contain only numeric values, after displaying the table in Design View and selecting the column under Field Name, set its Data Type to Number, Currency, or AutoNumber.
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