ISNULL
Returns a specified value if the object is NULL or empty.
ISNULL(Clock-in time): 1 is returned if Clock-in time is NULL or empty and 0 is returned if Clock-in time is not NULL or empty.
NVL
Returns the first value that is not null among all parameter values.
NVL(12,20) returns 12.
NVL(Null,12) returns 12.
NVL(Null,Null) returns Null.
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