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SQL Anywhere 12.0.0 » Context-Sensitive Help » SQL Anywhere plug-in help » Introduction to SQL Anywhere properties windows


Column Properties window: Constraints tab

This tab 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. See The NULL default.

  • 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. This option is disabled if you specified a spatial type for the column's built-in data type or if you specified a domain whose base type is a spatial type. See Column Properties window: Data Type tab.

 See also