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  3. Functions for Manipulating Data in SQL Server

Exercise

Accessing values from the next row

With the LEAD() function, you can access data from a subsequent row in the same query, without using the GROUP BY statement. This way, you can easily compare values from an ordered list.

This is the syntax: LEAD(numeric_expression) OVER ([PARTITION BY column] ORDER BY column)

In this exercise, you will get familiar with comparing values from the current row with values from the following row.

You will select information about the voters from France and arrange the results by total votes, in ascending order. The purpose is to analyze how the number of votes from each voter compares to the number of votes recorded for the next person in the list.

Instructions

100 XP
  • Create a new column, showing the number of votes recorded for the next person in the list.
  • Create a new column with the difference between the current voter's total_votes and the votes of the next person.