Along with 17+ years of hands-on experience, he holds a Masters of Science degree and a number of database certifications. I use the inbuilt SSMS Query generator, if I need to perform something quick and simple. By using cascading referential integrity constraints, you can define the actions that SQL Server 2005 takes when a user tries to delete or update a key to which existing foreign keys point. It completely removes the table structure and associated indexes, statistics, permissions, triggers and constraints. Please refer to this article, SQL Server foreign key to dig in more details on delete and update rules in SQL Server foreign key. Insert some sample data using below T-SQL script. [nombre_esquema].nombre_objeto cuando nombre_basededatos es la base de datos actual o tempdb y nombre_objeto comienza con #.Azure SQL Database supports the three-part name format database_name. When you use the SQL DROP TABLE statement to remove a table, the database engine deletes all objects associated to that table including data, table structure, indexes, constraints, triggers and maybe privileges. The SQL Server DROP TABLE statement is used to remove a table definition and all data, indexes, triggers, constraints, and permission specifications for that table. Now update CountryID in the Countries for a row which also updates the referencing rows in the child table States. Now on the Cities table, create a foreign key without a DELETE CASCADE rule. [schema_name].object_name when the database_name is the current dat… Click on Close and save the table in the designer. Pinal Dave is a SQL Server Performance Tuning Expert and an independent consultant. I do not want to alter the tables / indexes, I just need this instruction to cascade:-- this alters the CONSTRAINT -- not an option: ALTER TABLE T2 ADD CONSTRAINT fk_employee FOREIGN KEY (employeeID) REFERENCES T1 (employeeID) ON DELETE CASCADE; Also I would like (read - prefer) not to change the IDE GUI settings. This is Vinoth from Coimbatore. DELETE FROM T_Client WHERE CLI_ID = x DROP a UNIQUE Constraint. The below example demonstrates this scenario. In the INSERT and UPDATE specifications, select Cascade for the delete rule. This is not what we achieved, because for the expression to refer exclusively to the table we want to delete, then we need to use a constraint in the form of ON DELETE CASCADE. Example 2 - Error that occurs when using DROP TABLE without the IF EXISTS clause To drop a UNIQUE constraint, use the following SQL: SQL Server / Oracle / MS Access: In this article, we explored a few examples on DELETE CASCADE and UPDATE CASCADE rules in SQL Server foreign key. In case you have any questions, please feel free to ask in the comment section below. SQL Server does not remove these stored procedures and views. But on Cities table, we have a foreign key constraint with no action for delete and the referenced value still exists in the table. In this article, we will review on DELETE CASCADE AND UPDATE CASCADE rules in SQL Server foreign key with different examples. And I will apply the primary key on both of the tables. SQL> SQL> insert into gender_tab values ('F', 'Female'); 1 row The syntax of SQL DROP TABLE … DROP TABLE removes one or more tables. The SQL DROP TABLE Statement The DROP TABLE statement is used to drop an existing table in a database. Oracle provides no direct way to drop multiple tables at once. 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