How to find the difference in number of days between two dates using Spark SQL?

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You can use the DATEDIFF function in Spark SQL to find the difference in number of days between two dates. Here is an example:

SELECT DATEDIFF('2021-10-15', '2021-10-10') AS day_diff;

This will return the difference in number of days between October 10, 2021 and October 15, 2021, which is 5.

You can replace the date strings in the example with column names from a table to calculate the difference between dates in that table.