Bristlecone Consultant Interview Questions and Answers

Indexing is a technique to improve database performance by creating a quick lookup of data.

• Indexing helps in faster retrieval of data from a database.

• It reduces the time taken to search for data in a large database.

• Indexes can be created on one or more columns of a table.

• Examples of indexes include primary key, unique key, and clustered index.

• Indexing can also help in optimizing query performance.

Query to retrieve hierarchical data from a table with parent-child relationship maintained by ID and parent ID.

• Use a self-join to join the table with itself based on the parent ID and ID columns.

• Use a recursive CTE (Common Table Expression) to traverse the hierarchy and retrieve all levels of data.

• Order the results by the hierarchy level to display the data in a hierarchical structure.