How to create a column with the 'next date' in SQL for solving a problem using ranges?

To create a column with a "next date" in SQL for working with ranges, window functions like LEAD() are usually used. It allows you to get the value from the next row in a specified order.

Example for a table with start dates of ranges:

SELECT
  start_date,
  LEAD(start_date) OVER (ORDER BY start_date) AS next_date
FROM ranges;

Here, next_date is the start date of the next range, which can serve as the end of the current range. If LEAD() returns NULL (for the last row), you can substitute the desired value, such as the end date of the period.

This approach is convenient for analyzing and constructing continuous or non-overlapping time intervals.