The nonclustered index is a <span>type of index that has an index key value that points to a data row, which contains the key value. </span><span>This index has a structure separate from the data rows and contains index key values and each key value entry has a pointer to the data row that contains the key value. </span><span>Clustered indexes on the other hand sort and store the data rows in the table or view based on their key values.</span>
