SQL Server Unique Constraint Multiple Null Values
A unique index guarantees that the index key contains no duplicate values and therefore every row in the table is in some way unique. Specifying a unique index makes sense only when uniqueness is a...
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Unique index vs unique constraint in SQL Server
To start with there is no practical difference between Unique Index and unique constraint; they both accomplish the task of providing uniqueness to a column. A unique constraint is enforced by creating...
View ArticleSQL Server– Unique Constraint VS Unique Index
Both enforces uniqueness of the column. When we define an Unique constraint, SQL server creates an unique index (Unique non clustered index) on the column where Unique constraint is defined. Even...
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