Question

Consider the fowling structure:

CREATE TABLE [tblEntityLogs]
(
    [EntityLogId] [int] IDENTITY(1,1) NOT NULL,
    [EntityCountCurrent] [float] NOT NULL,
    ...
)

When executing the query underneath I get an empty row returned…

DECLARE @N FLOAT
SET @N = 666

SELECT ISNULL(tblEntityLogs.EntityCountCurrent, @N) AS EntityCountCurrent
FROM tblEntityLogs

And if I do:

SELECT tblEntityLogs.EntityCountCurrent FROM tblEntityLogs

The same thing happens. I don’t even get NULL back.

Note: The table is empty.

Answer 1

If the table is empty then you won’t get anything back – it’s by design.

Although, I don’t why you’d use/test it with IsNull as your table structure doesn’t allow Nulls.