SQL get fields which are null/empty for each record returned - sql

Question

I have the below query which I'm using to retrieve records which have at least one of the following columns set as NULL or '':
MainImage
Summary
Description
DECLARE #missingFields varchar(100)
SET #missingFields = ''
SELECT
c.[UnitReference] as 'UnitRef',
t.[NodeName] as 'Property',
#missingFields as 'Field/s missing'
FROM [DetailPage] d
INNER JOIN [CRM] c
ON d.ItemID = c.ItemID
INNER JOIN
[Tree] t
ON d.[ID] = t.[ID]
WHERE (ISNULL(d.MainImage, '') = '' OR ISNULL(d.Summary,'') = '' OR ISNULL(d.[Description],'') = '')
AND c.[IsListed] = 1 AND c.[IsMarketed] = 1
This returns the data I want however I also need to build up a string which lists which of the columns is null or empty for the returned record, e.g. "Main Image is empty, Description is empty" when a record has empty MainImage and Description columns.
I've tried:
#missingFields = CASE WHEN ISNULL(MainImage, '') = '' THEN 'Main image is null' ELSE '' END -- etc...
But I can't include this with the data retrieval operations. How would I go about doing this?

Answer 1

SELECT c.[UnitReference] AS 'UnitRef',
t.[NodeName] AS 'Property',
( CASE
WHEN d.MainImage IS NULL
THEN 'Main Image is Null, '
WHEN d.MainImage = ''
THEN 'Main Image is Empty, '
ELSE ''
END )+
( CASE
WHEN d.Summary IS NULL
THEN 'Summary is Null, '
WHEN d.Summary = ''
THEN 'Summary is Empty, '
ELSE ''
END )+
( CASE
WHEN d.[Description] IS NULL
THEN 'Description is Null, '
WHEN d.[Description] = ''
THEN 'Description is Empty, '
ELSE ''
END ) AS MissingFields
FROM [DetailPage] d
INNER JOIN [CRM] c
ON d.ItemID = c.ItemID
INNER JOIN [Tree] t
ON d.[ID] = t.[ID]
WHERE( d.MainImage IS NULL OR d.MainImage = '' )
OR ( d.Summary IS NULL OR d.Summary = '' )
OR ( d.[Description] IS NULL OR d.[Description] = '' )
AND c.[IsListed] = 1
AND c.[IsMarketed] = 1