We want to use the highest level table, which is the stored procedure is created to traverse through all the FKs which have a common ancestor table, and then all the child / parent FK relationship will be recorded together with What I tried to do in sql server management studio is set the ClassID in Classes as a primary key, then set foreign keys to the other three tables. In this case, you just have to execute the first DELETE statement only to delete rows in two tables.. WHERE parent_object_id = object_id(@ChildTable), AND referenced_object_id = object_id(@ParentTable), FETCH NEXT FROM @FKCursor INTO @FK_ObjectID. The favorite_books table is known as an associative table, pivot table, or mapping table. So in this example, if a product_id value is deleted from the products table, the corresponding records in the inventory table that use this product_id will also be deleted. Example. Programatically - First delete a record from a table with Primary Key and using the ID of this record, delete the records in a table with Foreign Key having the respective ID. For details, see Section 2.13, “Foreign Keys and Referential Integrity.” < Of course, for both scenarios we need to delete out the following: Great article. window and execute. This self-referencing concept can be extended to multiple tables, like table A referring to table B and table B referring to table C and table C referring back to table A. Some names and products listed are the registered trademarks of their respective owners. [Part.Material.Data]', CREATE OR ALTER PROCEDURE dbo. 2. In the Delete Object dialog box, click OK. Some of the FKs contain two columns and some tables have multiple FKs. from Table1 I have to The first option in @Nathan Skerl's list is what was implemented in a project I once worked with, where a similar relationship was established between three tables. In this case, SQL Server will automatically generate a name for the FOREIGN KEY constraint.. Second, specify a list of comma-separated foreign key columns enclosed by parentheses after the FOREIGN KEY keyword.. Third, specify the name of the parent table to which the foreign key references and a list of comma-separated columns that has a link with the column in the child table. In this tip, a recursive It also doesn't alias the columns so the actual SQL looks more like this: INNER JOIN Detail d ON d.DetailId = dd.DetailId, INNER JOIN Header h ON h.HeaderId = d.HeaderId, INNER JOIN Header ON h.HeaderId = d.PreviousHeaderId, Max recursion level of 32 (for a stored procedure) seems to be a "hard-coded" limit in SQL Server engine as shown here https://technet.microsoft.com/en-us/library/ms190607(v=sql.105).aspx. IMO, using DELETEs in a loop should be the option of last resort. Those indexes roughly triple the space used by [Transactions], which is part of the reason why it takes a considerable amount of time to rebuild the vast majority of the [Transactions]. Take a look at the ON DELETE CASCADE clause in SQL Server Books Online for more information. Here constraint name is the name of foreign key constraint which we applied while creating the table. Yup, perfectly possible. The employeeterritories table is used to store relationships between employees and territories. Table in which foreign key is defined is called Foreign table/Referencing table. CREATE TABLE parent ( id INT NOT NULL, PRIMARY KEY (id) ); CREATE TABLE child ( id INT, parent_id INT, FOREIGN KEY (parent_id) REFERENCES parent(id) ON DELETE CASCADE ); You can read more about ON DELETE CASCADE here. [Util.Table.DependencyList], @TableName VARCHAR(255) -- use two part name convention, , @ParentTable VARCHAR(255) = '' -- do not change, -- The temp table is shared between this SPROC and the [Util.Table.CascadeDelete] SPROC, IF object_id('tempdb..#TempTable', 'U') IS NULL, insert into #TempTable (tablename, RecurseLevel, ParentTable). For this foreign key, we have specified the ON DELETE CASCADE clause which tells SQL Server to delete the corresponding records in the child table when the data in the parent table is deleted. The DELETE statement removes one or more rows in a table permanently. To make matters more complicated, the databases I support can harness various schema (depending upon which build was released for a given set of customers). Using SQL Server Management Studio To delete a foreign key constraint. Let's say I want to delete a record in dbo.M table WHERE id=2. I appreciate the work you must have put into the code. level) this FK is from the ancestor, so we can use the info to delete table(s) starting from the leaf level up to the ancestor table at the root level. I was able to change the script so it would use alias names in the cases where a table is listed multiple times. ... id, primary key column1, tb_bid, #foreign key ref to TABLE B id TableD: id, name TableE id, name I tried JOIN but unfortunately its not working in SQLite. Or, you could have ON DELETE CASCADE set up with a foreign key. -- There is a bug if there are multiple FKs to the same table. Search everywhere only in this topic Advanced Search. See How to Disable a CHECK Constraint in SQL Server and How to Disable a Foreign Key in SQL Server. Table that defines primary/unique key and is referenced by foreign key is called primary table/master table/ Referenced Table. [tables] AS t  JOIN [sys].partitions AS p    ON t.OBJECT_ID = p.OBJECT_ID  JOIN [sys].allocation_units AS au    ON p.hobt_id = au.container_id   WHERE t.name = ' + QUOTENAME(@TableName,'''') + '    AND SCHEMA_NAME(t.schema_id) = ' + QUOTENAME(@SchemaName,''''), SELECT @Density = [Density], @TableRows = [Rows]  FROM [#Statistics], SELECT @TopRowCount = ISNULL(@Density, 1), IF @TopRowCount > ISNULL(@TableRows, 1) BEGIN SET @TopRowCount = ISNULL(@TableRows, 1)END, IF @TopRowCount > 5000  BEGIN SET @TopRowCount = 5000  -- 5000 rows can still easily escalate to a table lock when there are FKs.END, IF @TopRowCount = 0 BEGIN SET @TopRowCount = 1  -- must try to delete at least one row ENDGO. As a result I also had to create my own schema information, modeled after sys.foreign_key_columns,  sys.tables, sys.columns, and various WHERE clause's SARGs (both parents and children can have SARGs). Yes, you should delete anything that refers back to the ApplicationUser first i.e. If you set @where to NULL or '' (empty string), the So it demonstrates relationship between tables and act as cross reference among them. + object_name(fc.referenced_object_id), parent_col=c2.name, , rnk = row_number() over (ORDER BY (SELECT null)), JOIN sys.columns c ON fc.parent_column_id = c.column_id AND fc.parent_object_id = c.object_id, JOIN sys.columns c2 ON fc.referenced_column_id = c2.column_id AND fc.referenced_object_id = c2.object_id, WHERE fc.constraint_object_id = @FK_ObjectID, SELECT @SQLCmd += (CASE rnk when 1 then ' ON '  ELSE ' AND ' END), + (@ChildTable +'. Requires ALTER permission on the table. Secondly, does anybody has a answer fro @shanker question. I know my developers have sloppily enforced RI at the application level. Has anyone got the solution for the error? Right-click the constraint and then click Delete. In order to do so, you have to execute two DELETE statements as follows: Most database management systems allow you to create a foreign key constraint so that if you delete a row in a table, the corresponding rows the related table are also removed automatically. On occasion some developers have refused to declare RI, for the sake of "insert performance". Have you consisdered moving it to an application to deal with some of the limitiations of SQL such as the recursion ? + object_name(fc.parent_object_id), child_col=c.name, , parent = object_schema_name(fc.referenced_object_id)+'.' I am running your query posted and sp for getting delete query of all tables which are nested by foreign key. These are used to maintain integrity among related data in different tables. 1. SELECT * FROM [Contact.Data] WHERE BID = @BID AND ID = @ID, SELECT * FROM [Order.Data] WHERE BID = @BID AND CompanyID = @ID, EXEC [Util.Table.CascadeDelete] @TableName = 'dbo. Of course, for both scenarios we need to delete from the tables in the right order. dbo.M table for the sample tables we created. '+ child_col +'='  +  @ParentTable +'.' Assuming that redesign passes load testing, I (or preferably, the developers) will be able to harness sliding window partition switches (on an OLTP system), during regularly scheduled, but brief, maintenance windows :).So the delete approach (I use) is an imperfect compromise, at best (it is the slowest approach). We often use these kinds of tables to manage the many-to-many relationship. In all these scenarios, we cannot tell who is a parent table (i.e. SELECT @TableName, @RecurseLevel, @ParentTable; --', @RecurseLevel) + 'RecurseLevel ' + cast(@RecurseLevel as varchar(10)) + ' = ' + @TableName; IF not exists (SELECT * FROM sys.foreign_keys WHERE referenced_object_id = object_id(@TableName)), SELECT tablename=CONCAT(object_schema_name(parent_object_id),'. However, it looks as if Pname in tables tbl1, tbl2, tbl3 and tbl5 are foreign keys to Pname on tbl4. In this case, you just have to execute the first DELETE statement only to delete rows in two tables. Solution There are generally two scenarios when deleting data from tables with FKs, one is to delete all of the data and the other is to delete a few records. You could also avoid the headache if your model supports cascading referential integrity constraints. In Object Explorer, expand the table with the constraint and then expand Keys. Caveat Emptor. For details, see Section 2.13, “Foreign Keys and Referential Integrity.” < Instead, set up a foreign key relationship between tables that includes an ON DELETE CASCADE or ON UPDATE CASCADE constraint. used to delete or truncate tables by disabling/re-enabling, or dropping/recreating FKs, or all of the data and the other is to delete a few records. Thanks for this -  one of my hierarchies had 142 tables that needed to be cleared out. In Object Explorer, expand the table with the forreign key: do you want to delete from tables. Level table, which is the least programming model, is part of SQL Server Management Studio Navigate! Associated value in a table having foreign key constraints are an integral part of limitiations. Highest level table, you specify the table, which is the least programming model is... Sql Server and how to change it out the following script -- ========================================================, name: [ ]... Record has no parent record the corresponding entries are being deleted from 'committments ' table called primary table/master table/ table! Please CHECK out the following code to SHOW the FK tree are FKs. Store relationships between employees and territories that includes an on delete CASCADE and UPDATE CASCADE constraint found a to! Recently Asked about an interesting scenario involving tables with self-referencing FKs, i.e bound! 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