Sql updating primary key value No join sexchat

Posted by / 21-Aug-2020 16:24

Sql updating primary key value

How can these rules be used effectively without threatening the relational integrity?Foreign key constraints may be created by referencing a primary or unique key.But if a value exists, then it is bound to have an associated value in a parent table.When applying update or delete operations on parent tables there may be different requirements about the effect on associated values in child tables.Since we did not define a specification for our foreign key the default No Action is used.

Microsoft is conducting an online survey to understand your opinion of the Msdn Web site.The conflict occurred in database "Adventure Works", table "dbo. The conflict occurred in database "Adventure Works", table "dbo. Select the CASCADE rule from the SSMS GUI as shown in the above screenshot or use this T-SQL code.The following script adds "ON DELETE CASCADE ON UPDATE CASCADE" -- Script 5: Create FK relationship with CASCADE-- Create FK relationship IF EXISTS (SELECT * FROM sys.objects WHERE name = N'FK_Emp Education_Employees' AND [type] = 'F')ALTER TABLE Emp Education DROP Constraint FK_Emp Education_Employees GOALTER TABLE Emp Education ADD CONSTRAINT [FK_Emp Education_Employees]FOREIGN KEY (empno)REFERENCES employees(empno)ON DELETE CASCADE ON UPDATE CASCADE GO -- Script 6: Create FK relationship with SET NULL-- Create FK relationship IF EXISTS (SELECT * FROM sys.objects WHERE name = N'FK_Emp Education_Employees' AND [type] = 'F')ALTER TABLE Emp Education DROP Constraint FK_Emp Education_Employees GOALTER TABLE Emp Education ADD CONSTRAINT [FK_Emp Education_Employees]FOREIGN KEY (empno)REFERENCES employees(empno)ON DELETE SET NULL ON UPDATE SET NULLGO For utilizing the SET DEFAULT rule for update/delete operations default value should be there for foreign key column.Let's create the foreign key with the default specification through T-SQL.-- Script 2: Create FK relationship-- Create FK relationship IF EXISTS (SELECT * FROM sys.objects WHERE name = N'FK_Emp Education_Employees' AND [type] = 'F')ALTER TABLE Emp Education DROP Constraint FK_Emp Education_Employees GOALTER TABLE Emp Education ADD CONSTRAINT [FK_Emp Education_Employees]FOREIGN KEY (empno)REFERENCES employees(empno)GO -- Script 3: Populate the tables with sample data-- Insert records in parent table INSERT INTO employees SELECT 1, 'Atif' UNION ALLSELECT 2, 'Shehzad' UNION ALLSELECT 3, 'khurram' UNION ALLSELECT 4, 'Ahmed' UNION ALLSELECT 5, 'Uzair'GO-- Insert records in parent table INSERT INTO Emp Education SELECT 1, 'MS' UNION ALLSELECT 2, 'MBA' UNION ALLSELECT 1, 'BS' UNION ALLSELECT 2, 'MS' UNION ALLSELECT 3, 'BS'GO For our data with default specification (No Action) SQL Server would not allow an update or delete operation on referenced values of the primary key table.

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