最大區別在於clustered是物理上實現數據排序，並且同一個表里只能有一個clustered索引，而nonclustered是邏輯上的排序。
There are clustered and nonclustered indexes. A clustered index is a special type of index that reorders the way records in the table are physically stored. Therefore table can have only one clustered index. The leaf nodes of a clustered index contain the data pages.
A nonclustered 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 on disk. The leaf node of a nonclustered index does not consist of the data pages. Instead, the leaf nodes contain index rows.
本文出自：馮立彬的博客
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