Updating the primary key


03-Mar-2020 03:47

Also, the Add new record with new key and Delete the old record is not a bad idea. Primary keys and foreign keys are two types of constraints that can be used to enforce data integrity in SQL Server tables. This column, or columns, is called the primary key (PK) of the table and enforces the entity integrity of the table.Sales Person table because there is a logical relationship between sales orders and salespeople.The Sales Person ID column in the Sales Order Header table matches the primary key column of the Sales Person table.(Requires at least 130 compatibility level.) The increase has the following restrictions: Unlike primary key constraints, creating a foreign key constraint does not automatically create a corresponding index.However, manually creating an index on a foreign key is often useful for the following reasons: Although the main purpose of a foreign key constraint is to control the data that can be stored in the foreign key table, it also controls changes to data in the primary key table. Primary Key Constraints Foreign Key Constraints Related Tasks A table typically has a column or combination of columns that contain values that uniquely identify each row in the table.Because primary key constraints guarantee unique data, they are frequently defined on an identity column.

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As shown in the following illustration, the Product ID and Vendor ID columns in the Purchasing.In a foreign key reference, a link is created between two tables when the column or columns that hold the primary key value for one table are referenced by the column or columns in another table.



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