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In addition to the updates and deletes authorized by referential integrity, there are three options associated with it: Restrict: this is the default value if no other option is set Set null: sets all matching in the foreign key column to null; all other values are unchanged Cascade: composed of two parts Deletes: an entire row is deleted from the data table when it matches a value in the foreign key column Updates: values in the foreign key column are changed to the new value; all other values are unchanged Data Validation is also a key in databases created through Microsoft Access.Data validation can be implemented during the design process of a database by setting data requirements for the user input to avoid errors.Each of the 4 numbers is stored into a capturing group, so you can access them for further processing. )\." "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\b"; def is_valid_ipv4(ip4): """Validates IPv4 addresses.

By setting an input mask in a field in Microsoft Access, it controls the way data can be entered. Example: Student titles such as Freshman, Sophomore, Junior, and Senior must be entered as ‘FR’, ‘SF’, ‘JR’, or ‘SR’.The database designer can also implement a validation rule text that displays a message stating the above rule if entered incorrectly. Data Types: You can restrict data types that are entered into an Access database by setting a certain required data type.Example: Input masks can specify that social security numbers be entered in the form of ‘AAA"-"AA"-"AAAA’. "Validating Data in Microsoft Access | Database Solutions for Microsoft Access | uk." Database Solutions & Downloads for Microsoft Access | uk. By using this setting the user’s input automatically formats to the specified form. Required Property: Using the required property is an easy way to avoid null values in unwanted areas.

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