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Editorial Team
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Asked: 2026-06-14T13:13:36+00:00

Consider the following SQL query: SELECT * FROM Orders WHERE (AdjShipDate IS NOT NULL

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Consider the following SQL query:

SELECT
   *
FROM 
   Orders
WHERE
   (AdjShipDate IS NOT NULL OR EstShipDate IS NOT NULL)
    AND
    CASE 
        WHEN AdjShipDate IS NOT NULL THEN AdjShipDate
        WHEN AdjShipDate IS NULL AND EstShipDate IS NOT NULL THEN EstShipDate
    END
    BETWEEN '2011-07-01' AND '2011-07-30'

The case’s WHEN expressions depend on a value (AdjShipDate) from the table that I’m trying to query. How would I write a similar query in Linq to SQL?

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1 Answer

  1. Editorial Team

    It’s essentially a COALESCE:

    where (o.AdjShipDate ?? o.EstShipDate) >= new DateTime(2011,07,01) 
   && (o.AdjShipDate ?? o.EstShipDate) <= new DateTime(2011,07,30)

    Though I’m not certain in the ?? operator is supported by Linq-to-SQL. If it doesn’t you could try

    where (o.AdjShipDate != NULL 
           && o.AdjShipDate >= new DateTime(2011,07,01) 
           && o.AdjShipDate <= new DateTime(2011,07,30))
   || (o.AdjShipDate == NULL && o.EstShipDate != NULL 
           && o.EstShipDate >= new DateTime(2011,07,01) 
           && o.EstShipDate <= new DateTime(2011,07,30))
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