How to get null values sorted to bottom?

I’m trying to sort a table in explore in descending order from a column. The problem is that the Null values are set above the actual non null values. How do I send them to the bottom?

I tried to use COALESCE() and convert the values to zero. It’s successful in displaying it but I’m merging different table so in the merge preview, it doesn’t appear as 0.

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Column being sorted on
0 1 987
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