Question

i have got a table (stores data of forum, means normally no edit and update just insert) on which i have a primary key column which is as we know a clustered index.
please tell me, will i get any advantage if i creates a non-clustered index on that column (primary key column)?

EDIT: my table has got currently around 60000 records, what will be better to place non-clustered index on it or create a same new table and create index and then copy records from old to new table.

Thanks

Answer 1

• Every table should have a clustered index
• Non-clustered indexes allow INCLUDEs which is very useful
• Non-clustered indexes allow filtering in SQL Server 2008+

Notes:

• Primary key is a constraint which happens to be a clustered index by default
• One clustered index only, many non-clustered indexes