Optimize Lookups with a Basic Index on last_name

Creating a Basic Index in PostgreSQL

Write a PostgreSQL query to create a simple index on a column to speed up query lookups.

Solution:

-- Specify the action to create an index.
CREATE INDEX idx_employees_lastname 
-- Define the target table and column for the index.
ON Employees(last_name);

Explanation:

• Purpose of the Query:
• The goal is to improve query performance when filtering or sorting by the "last_name" column.
• Key Components:
• CREATE INDEX idx_employees_lastname : Names the new index.
• ON Employees(last_name) : Specifies the table and column to index.

Notes:

• Indexes help the database engine quickly locate rows, reducing query response time.
• Ensure that the indexed column is frequently used in WHERE or ORDER BY clauses.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to create a basic index on the "zipcode" column in the "Addresses" table.
• Write a PostgreSQL query to create a basic index on the "created_at" column in the "Sessions" table.
• Write a PostgreSQL query to create a basic index on the "category" column in the "Items" table.
• Write a PostgreSQL query to create a basic index on the "title" column in the "Books" table.

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