What are the differences between a clustered and a non-clustered index?

Question

What are the differences between a clustered and a non-clustered index?

Answer 1

Clustered Index

1. There can be only one clustered index for a table.
2. Usually made on the primary key.
3. The leaf nodes of a clustered index contain the data pages.

Non-Clustered Index

1. There can be only 249 non-clustered indexes for a table(till sql version 2005 later versions support upto 999 non-clustered indexes).
2. Usually made on the any key.
3. The leaf node of a nonclustered index does not consist of the data pages. Instead, the leaf nodes contain index rows.