Question

I have the following SQL query:

select AuditStatusId 
from dbo.ABC_AuditStatus 
where coalesce(AuditFrequency, 0) <> 0

I’m struggling a bit to understand it. It looks pretty simple, and I know what the coalesce operator does (more or less), but dont’ seem to get the MEANING.

Without knowing anymore information except the query above, what do you think it means?

Answer 1

select AuditStatusId 
from dbo.ABC_AuditStatus 
where AuditFrequency  <> 0 and AuditFrequency  is not null

Note that the use of Coalesce means that it will not be possible to use an index properly to satisfy this query.