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SQL Anywhere 10.0.1 » SQL Anywhere 10 - Context-Sensitive Help » SQL Anywhere Plug-in Help » Introduction to SQL Anywhere property sheets

Column property sheet: Value tab Next Page

Column property sheet: Constraints tab

The Constraints tab of the Column property sheet has the following components:

Values can be null    Select this option if values in the column can be NULL. If the column is based on a domain, you can retain the domain's nullability or override it for the column.

Values cannot be null    Select this option to allow duplicate values, but not allow NULL values in this column.

Values cannot be null and must be unique    Select this option if values in the column cannot be NULL and must be unique.

See also