Enhance Lookup Speed on last_name Column

Create a B-tree Index on a Text Column

Write a PostgreSQL query to create a B-tree index on the "last_name" column in the Employees table.

Solution:

-- Create a B-tree index on the "last_name" column.
CREATE INDEX idx_employees_lastname ON Employees USING btree (last_name);

Explanation:

• Purpose of the Query:
• The goal is to speed up searches and sorting operations on the "last_name" column using a B-tree index.
• This demonstrates how to explicitly specify the B-tree index type for textual data.
• Key Components:
• CREATE INDEX idx_employees_lastname : Names the index to be created.
• ON Employees USING btree (last_name) : Specifies the table, index type (B-tree), and target column.
• Real-World Application:
• Commonly used for columns that involve range queries, ordering, and lookups.

Notes:

• B-tree indexes are the default in PostgreSQL and are suitable for most data types and query patterns.
• They work best with equality and range comparisons.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to create a B-tree index on the "surname" column in the "Clients" table.
• Write a PostgreSQL query to create a B-tree index on the "city" column in the "Addresses" table.
• Write a PostgreSQL query to create a B-tree index on the "title" column in the "Books" table to optimize text searches.
• Write a PostgreSQL query to create a B-tree index on the "department" column in the "Employees" table for faster lookups.

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