This tutorial shows you how to use the SQL window functions to solve complex query challenges in easy ways.

This tutorial shows you how to use the SQL window functions to solve complex query challenges in easy ways.

You'll learn how to use the SQL PARTITION BY clause to divide a result set into multiple partitions to which a window function applies.

The FIRST_VALUE() is a window function that returns the first value in an ordered set of values. Here’s the syntax of the FIRST_VALUE() function: FIRST_VALUE(expression) OVER ( partition_clause order_clause frame_clause ) Code language: SQL (Structured Query Language) ( …

The ROW_NUMBER() is a window function that assigns a sequential integer number to each row in the result set. Here’s the syntax of the ROW_NUMBER() function: ROW_NUMBER() OVER ( [PARTITION BY expr1, expr2,...]

The CUME_DIST() is a window function that calculates the cumulative distribution of value within a set of values. The CUME_DIST() function returns a value that represents the number of rows with values less than or equal to ( <= )the current row’s value divided by the total number of rows:

The SQL NTILE() is a window function that allows you to break the result set into a specified number of approximately equal groups, or buckets. It assigns each group a bucket number starting from one.

SQL LEAD() is a window function that provides access to a row at a specified physical offset that follows the current row. For example, by using the LEAD() function, from the current row, you can access data from the next row, the second row that follows the current row, the third row that follows the current row, and so on.

The PERCENT_RANK() is a window function that calculates the percentile ranking of rows in a result set. The syntax of the PERCENT_RANK() function is as follows: PERCENT_RANK() OVER ( PARTITION BY expr1, expr2,...

The LAST_VALUE() is a window function that returns the last value in an ordered set of values. Here’s the basic syntax of the LAST_VALUE() function: LAST_VALUE(expression) OVER ( partition_clause order_clause frame_clause ) Code language: SQL (Structured Query Language) ( …