When complex SQL queries are generated for you, there is no need to expose SQL’s complexity when you handle some functions. The unnecessary complexity of the SQL OVER ROWS clause is hidden by a simple visual selection of a frame on screen. You can much better understand how ROWS works after playing for just a few minutes with our visual SQL query builder for window functions.
As expected, the FIRST_VALUE and LAST_VALUE window functions return the first and last value in their partition. However, prepare for some surprises along the way, especially for LAST_VALUE. We’ll show you how to call them properly and how to emulate them with ROWS BETWEEN.
LAG window function looks at some row behind. It can be emulated with the ROWS BETWEEN clause. We do it here and then compare it with the direct call. Finally, we show you how LAG works with a visual image of the partition used by both LEAD/LAG and the ROWS-based window functions.
We emulate the SQL Lead window function with the ROWS BETWEEN clause, and compare it with a direct call. We show you a visual image of the partition on which both LEAD/LAG and ROWS-based window functions work.
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