#unique constraint in sql server

[bigdatansql]

UNIQUE KEY in SQL Server

This article's goal is to add to "SQL Server All in One." The use of a unique constraint makes sure that no duplicate values are recorded in any given column that does not function as the primary key. A corresponding unique index is generated when a uniq

This article’s goal is to add to “SQL Server All in One.” The use of a unique constraint makes sure that no duplicate values are recorded in any given column that does not function as the primary key. A corresponding unique index is generated when a unique constraint is created. Though the PRIMARY KEY consists of UNIQUENESS and NOT NULL, only one PRIMARY KEY constraint is allowed for each table.…

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