In this tutorial, we write a SQL Query to forward fill values for NULL records. This is also known as the Last Not NULL puzzle.
We make use of Windows function FIRST_VALUE. We also write the query using MAX function.
This is a FAANG interview query.
The practice data and SQL Queries are available here-
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Difference between Count(*), Count(1) and Count(column)
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Check out the complete list of SQL Query Interview Questions -
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