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On-line Documentation

Checks


An integrity constraint is a rule that restricts the values in a database.

 

A check constraint requires a value in the database to comply with a specified condition. A check specifies an expression producing a Boolean result which new or updated rows must satisfy for an insert or update operation to succeed. Expressions evaluating to TRUE or UNKNOWN succeed. Should any row of an insert or update operation produce a FALSE result an error exception is raised and the insert or update does not alter the database.

 

Table checks are managed within the Checks tab of Table Editor.

 

 

Creating Checks

  • open the table in Table Editor;
  • proceed to the Checks tab there;
  • right-click the tab area and select the New Check Constraint context menu item, or press the Ins key;
  • define the check properties using Check Editor.

 

Editing Checks

  • open the table in Table Editor;
  • proceed to the Checks tab there;
  • right-click the check and select the Edit Check <check_name> context menu item, or simply double-click the check;
  • edit the check properties using Check Editor.

 

Dropping Checks

  • open the table in Table Editor;
  • proceed to the Checks tab there;
  • right-click the check and select the Drop Check <check_name> context menu item;
  • confirm dropping in the dialog window.