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Editorial Team
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Asked: 2026-05-31T10:35:51+00:00

I have come across an issue which I am not sure how to fix.

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I have come across an issue which I am not sure how to fix. In my stored procedure I use DATEDIFF() function to return an int for date difference. In my logic I have also subtracted a value from the returned value of DATEDIFF() which is giving me a negative value. This is by design as this logic is for working out rates.

My problem is I am using a case statement but I can’t select the column because it is using an Alias. What I aim to do is to write some additional logic where if the value is negative I want it to display as 0.

See my code below for more information:

DATEDIFF(d, vso.pod_ata, ISNULL(cncr.cntr_date3, GETUTCDATE())) - 14  AS dem_days, -- Date difference to work out Demurrage days
DATEDIFF(d, cncr.dc_ata, ISNULL(cncr.empty_return_dt, GETUTCDATE())) - 21  AS det_days,

CASE WHEN dem_days <= 0 THEN 0 END AS 'test1',
CASE WHEN det_days <= 0 THEN 0 END AS 'test2',

Error message is:

Invalid column name ‘dem_days’.
Invalid column name ‘det_days’.

What is the best solution to fix this?

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1 Answer

  1. Editorial Team

    use this datediff function whenever you need.

    DATEDIFF(d, vso.pod_ata, ISNULL(cncr.cntr_date3, GETUTCDATE())) - 14  AS dem_days, -- Date difference to work out Demurrage days
DATEDIFF(d, cncr.dc_ata, ISNULL(cncr.empty_return_dt, GETUTCDATE())) - 21  AS det_days,

CASE WHEN DATEDIFF(d, vso.pod_ata, ISNULL(cncr.cntr_date3, GETUTCDATE())) - 14 <= 0 THEN 0 END AS 'test1',
CASE WHEN DATEDIFF(d, cncr.dc_ata, ISNULL(cncr.empty_return_dt, GETUTCDATE())) - 21 <= 0 THEN 0 END AS 'test2',
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