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Setting field flags
Use the Field flags group to set the field properties described below.
Not Null
Forbids the NULL values for the field.
Unique
Includes the field into the unique key (index).
Primary Key
With this option checked the field becomes the only field with a primary key. If you check this field, you will not be able to set this attribute for any other field in the table. Hence if you want to create a compound primary key, do not check this field but create a primary key through the Indexes tab of Table Editor or the appropriate step of Create Table Wizard.
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