Question - What are Index, cluster index, and non-cluster index?
Answer -
Clustered Index:- A Clustered index is a special type of index that reorders the way records in the table are physically stored. Therefore table may have only one clustered index.
Non-NonClustered Index:- A Non-Clustered index is a special type of index in which the logical order of the index does not match the physical stored order of the rows in the disk. The leaf nodes of a non-clustered index do not consist of the data pages. instead, the leaf node contains index rows.