SQL Server Interview Question & Answer Quiz on CREATE statement
SQL Server Interview Question & Answer Quiz on CREATE statement
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sql primary key
Primary Key VS Composite Key?
A PRIMARY KEY constraint uniquely identifies each record in a table .
A COMPOSITE KEY is a combination of two or more columns in a table that can be used to uniquely identify each row in the table when the columns are combined uniqueness is guaranteed, but when it taken individually it does not guarantee uniqueness.