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How to create Foreign Key Constraint With ON UPDATE CASCADE in SQL Server - SQL Server Tutorial 79
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Solution Foreign key constraints may be created by referencing a primary or unique key. There are four available options in SQL Server and as follows: Note that the foreign key columns must be nullable for this action to execute. Foreign key constraints ensure the relational integrity of data in associated tables. How can these rules be used effectively without threatening the relational integrity? SQL Server deletes the rows in the child table that is corresponding to the row deleted from the parent table. Cascade Associated values in child table would also be updated. SQL Server sets the default values for the rows in the child table that have the corresponding rows in the parent table updated. Before proceeding with the demo, here is summary of the effects for update and delete operations: A foreign key value may be NULL and indicates a particular record has no parent record. While implementing update and delete operations on values in the parent table referenced table with primary key we have to consider the impact on related values in the child table.
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SQL Server deletes the rows in the child table that is corresponding to the row deleted from the parent table. Create sample tables -- Use required database. SQL Server sets the default values for the rows in the child table that have the corresponding rows in the parent table updated.
If no default value is provided in foreign key column this rule could not be implemented. Create and populate tables having FK relation Now let's create a couple of tables to resemble a foreign key relationship. Update action of rows in the parent table If you update one or more rows in the parent table, you can set one of the following actions:
Associated values in child table would be set to default value specified in column definition. Foreign key constraints ensure the relational integrity of data in associated tables. If no default value is provided in foreign key column this rule could not be implemented.