A table typically has a column or combination of columns that contain values that uniquely identify each row in the table. This column, or columns, is called the primary key (PK) of the table and ...

ALTER TABLE column_constraint specifies the properties of a PRIMARY KEY, FOREIGN KEY, UNIQUE, or CHECK constraint that is part of a new column definition added to a table. Is the name of the ...

Sql constraintsa constraint is a rule or limitation that we place on the data in a database that we can put into a column(s). a constraint is part of the table. we can apply constraints when we create ...

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. Skip ...

the Key attribute is required -- you have to use it to tell Entity Framework which of your columns corresponds to your table's primary key. This example tells Entity Framework that the Id property is ...