There are three types of window functions including value window functions, aggregation window functions, and ranking window functions. Value window functions # FIRST_VALUE()

SQL LAG() is a window function that provides access to a row at a specified physical offset which comes before the current row. In other words, by using the LAG() function, from the current …

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 ( …

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 …

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 …

In SQL, a window function allows you to calculate across table rows that are somehow related to the current row. A window function uses the OVER clause to define the window or a set of …

The RANK() function is a window function that assigns a rank to each row in the partition of a result set. The rank of a row is determined by one plus the number of ranks that come before …

The DENSE_RANK() is a window function that assigns a rank to each row in partitions with no gaps in the ranking values. If two or more rows in the same partition have the same values, …

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() …

This section provides you with many built-in SQL functions including aggregate functions, date functions, string functions, and window functions.