Cluster index is a type of index which sorts the data rows in the table on their key values. In the Database, there is only one clustered index per table.
A clustered index defines the order in which data is stored in the table which can be sorted in only one way. So, there can be an only a single clustered index for every table. In an RDBMS, usually, the primary key allows you to create a clustered index based on that specific column.
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