delete primary and foreign key from the form side

Question

please send me some links where i can read update and delete primary and foreign key values from the form side . i have window forms and using joins i want to delete values which is attaches from the foreign key and primary key

Code Alone · Answer

Hi, As per your requirement you can write Stored Procedure for the Operation, And pass your parameters as well. And use that on your Form. Here I am providing you the solution(Query) . To DELETE PRIMARY KEY IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA . TABLE_CONSTRAINTS WHERE CONSTRAINT_TYPE = 'PRIMARY KEY' AND TABLE_NAME = '[table name]' AND TABLE_SCHEMA = 'dbo' ) BEGIN DECLARE @CONSTRAINT_NAME NVARCHAR ( 1000 ) SELECT @CONSTRAINT_NAME = CONSTRAINT_NAME FROM INFORMATION_SCHEMA . TABLE_CONSTRAINTS WHERE CONSTRAINT_TYPE = 'PRIMARY KEY' AND TABLE_NAME = '' AND TABLE_SCHEMA = 'dbo' DECLARE @sql NVARCHAR ( 1000 ) = 'ALTER TABLE [table name] DROP CONSTRAINT ' + @CONSTRAINT_NAME ; EXEC ( @sql ); END TO DELETE FOREIGN KEY IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA . TABLE_CONSTRAINTS WHERE CONSTRAINT_TYPE = 'FOREIGN KEY' AND TABLE_NAME = '[table name]' AND TABLE_SCHEMA = 'dbo' ) BEGIN DECLARE @CONSTRAINT_NAME NVARCHAR ( 1000 ) SELECT TOP 1 @CONSTRAINT_NAME = CONSTRAINT_NAME FROM INFORMATION_SCHEMA . TABLE_CONSTRAINTS WHERE CONSTRAINT_TYPE = 'FOREIGN KEY' AND TABLE_NAME = '[table name]' AND TABLE_SCHEMA = 'dbo' DECLARE @sql NVARCHAR ( 1000 ) = 'ALTER TABLE [table name] DROP CONSTRAINT ' + @CONSTRAINT_NAME ; EXEC ( @sql ); END Note : You can use it iterative or find the number of forign keys

Mageshwaran R · Answer

Hi, Try this code: ALTER TABLE DROP CONSTRAINT