In Sybase Central, you add, alter, and drop column constraints on the Constraints tab of the table or Column Properties window.
Use the SQL Anywhere 12 plug-in to connect to the database as a user with DBA authority.
In the left pane, double-click Tables.
Click the table you want to alter.
In the right pane, click the Constraints tab and modify an existing constraint or add a new constraint.
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