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Clustered Vs Non Clustered Index. Explaining Key SQL Performance… | by Farhad Malik | FinTechExplained | Medium
![sql - Should primary key clustered index columns added to the non clustered indexes? - Stack Overflow sql - Should primary key clustered index columns added to the non clustered indexes? - Stack Overflow](https://i.stack.imgur.com/GOWo8.png)
sql - Should primary key clustered index columns added to the non clustered indexes? - Stack Overflow
![SQL SERVER - Identify Table Where Clustered Index is Not a Primary Key - DMV - SQL Authority with Pinal Dave SQL SERVER - Identify Table Where Clustered Index is Not a Primary Key - DMV - SQL Authority with Pinal Dave](https://blog.sqlauthority.com/wp-content/uploads/2016/04/clpk3.png)
SQL SERVER - Identify Table Where Clustered Index is Not a Primary Key - DMV - SQL Authority with Pinal Dave
![The primary key is the default clustered index in SQL Server and MySQL. This implies a 'clustered index penalty' on all non-clustered indexes. The primary key is the default clustered index in SQL Server and MySQL. This implies a 'clustered index penalty' on all non-clustered indexes.](https://use-the-index-luke.com/static/fig05_03_secondary_index_on_clustered_index.x1.Q21aCRSZ.png)