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I am just learning about Indexing in SQL server but got confuse between Clustered and Unique index. if both are applied on a unique key column ex: PersonID. so what is difference between both.
Thanx.
A unique index is just an index with a unique constraint, nothing more, nothing less. A clustered index orders the data phsyically on the disk to match the index. It is useful if you access the data in the table very often via just one column, e.g. via the primary key. Also a table can have only one clustered index (obvious, of course).