I was reading a query and came upon the following code:
nvl(case when month>start then null else 0 end, 1)
and it seemed to me there was no reason for the nvl.
Why not do this:
case when month>start then 1 else 0 end
?
Why put NVL around WHEN in SQL?
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This is an escape clause to get the correct result when [month] has the value NULL.
Comparing NULL > start will yield 0 instead of 1. Using the NVL function will correct the NULL value to 1 as intended.
In case that [month] can never be NULL (column check?) then this code is redundant.