What is the purpose of the SQL pivot function?

The purpose of the PIVOT function in SQL is to convert row data into column data. With a given set of data, the PIVOT function can transform a specific column into a new column, using the values of that column as the column names. This makes it easier to analyze and display the data.

Specifically, the PIVOT function can achieve the following functions:

1. Pivot the data: Use the values in a column as the column names for a new column, while also using those values as the values for the new column.
2. Aggregate data: This involves performing operations such as summing, counting, averaging, etc. on transformed columns.
3. Changing the way data is presented: converting the rows of raw data into columns to make it easier to understand and analyze.

The PIVOT function is typically used in conjunction with aggregate functions (such as SUM, COUNT, AVG, etc.) and the GROUP BY clause to pivot and aggregate data based on specific columns.