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Imagine you're looking at a SQL Server integer column where some rows are null:
select day, tickets from stats;
day | tickets ------------+--------- 2020-02-01 | 1 2020-02-02 | null 2020-02-03 | 3
Instead of having that null, you might want that row to be 0. To do that, use the coalesce() function, which returns the first non-null argument it's passed:
coalesce()
select day, coalesce(tickets, 0) from stats;
day | tickets ------------+--------- 2020-02-01 | 1 2020-02-02 | 0 2020-02-03 | 3
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