SQL Tutorial: How to Retrieve the Last 5 Records from a Table - SQL Interview Questions

Welcome to our tutorial on how to read the last 5 records from a table using a SQL query. In this video, we will walk you through the step-by-step process of using SQL to extract the most recent 5 records from a table in a database. Whether you're a beginner or an experienced developer, this tutorial will provide you with the knowledge and skills you need to efficiently retrieve the latest data from your database.

In this video, we will cover:

Understanding the SQL query syntax for retrieving the last 5 records
Using the ORDER BY and LIMIT clauses to sort and limit the results
Demonstrating different examples with common SQL database systems such as MySQL, PostgreSQL, and SQL Server
Providing best practices and tips for optimizing your SQL queries for performance
Whether you're working on a personal project or a professional application, knowing how to read the last 5 records from a table can be a valuable skill. Join us in this tutorial and learn how to effectively query your database for the latest data!

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To read the last 5 records from a table using ROW_NUMBER(), you can use a similar query to the one used to retrieve the top 5 records, but with a different ordering in the ROW_NUMBER() function. Here's an example SQL query:

SELECT *
FROM (
SELECT *, ROW_NUMBER() OVER (ORDER BY column_name DESC) AS row_num
FROM table_name
) subquery
WHERE row_num (greater than) (SELECT COUNT(*) - 5 FROM table_name);

In this query, the subquery assigns a unique number to each row in the table_name table based on the values in the column_name column in descending order. The outer query selects the last 5 rows from the subquery based on the assigned row numbers, using a subquery to calculate the starting point for the last 5 rows.

Note that the ORDER BY clause in the ROW_NUMBER() function must be in descending order to get the last 5 rows. You can modify the ORDER BY clause to change the order in which the rows are assigned row numbers.

Also, the COUNT(*) function is used to get the total number of rows in the table, and subtracting 5 from this value gives the starting point for the last 5 rows.

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