Question

What can I do do make my statement return Null when there is no row with D.MetaDataID = '580c215f-54cb-4449-8368-7d740be71973' and the Data Table?

I’ve tried Left JOIN But nothing changes… 🙁

SELECT 
D.Value
FROM dbo.Item I
JOIN dbo.Data D ON D.ItemID = I.ID
WHERE  I.ItemTypeID = '14ea6709-1bf8-4d5c-9090-3ace3cc42874' --Instance.album
       AND D.MetaDataID = '580c215f-54cb-4449-8368-7d740be71973' --freepacks

Answer 1

You need a LEFT JOIN and to move the condition on D into the ON clause rather than WHERE. In the WHERE clause this converts your query back into an inner join.

SELECT D.Value
FROM   dbo.Item I
       LEFT JOIN dbo.Data D
         ON D.ItemID = I.ID
            AND D.MetaDataID = '580c215f-54cb-4449-8368-7d740be71973'
--freepacks
WHERE  I.ItemTypeID = '14ea6709-1bf8-4d5c-9090-3ace3cc42874' --Instance.album