Show column names having null values in row - sql

Question

I would like to display only those column name against the student id whose question(q1,q2,q3,q4...etc) value is null below is the printscreen of table against the id i would like to have question id . with below expected o/p

Answer 1

You can use FOR XML to achieve the result:
SQL Fiddle
;WITH Cte AS(
SELECT id, name, q = 'q1' FROM Test WHERE q1 IS NULL UNION ALL
SELECT id, name, q = 'q2' FROM Test WHERE q2 IS NULL UNION ALL
SELECT id, name, q = 'q3' FROM Test WHERE q3 IS NULL UNION ALL
SELECT id, name, q = 'q4' FROM Test WHERE q4 IS NULL UNION ALL
SELECT id, name, q = 'q5' FROM Test WHERE q5 IS NULL UNION ALL
SELECT id, name, q = 'q6' FROM Test WHERE q6 IS NULL
)
SELECT
id,
name,
incompletes = STUFF((
SELECT ',' + c2.q
FROM Cte c2
WHERE
c1.id = c2.id
AND c1.name = c2.name
GROUP BY c2.id, c2.name, c2.q
FOR XML PATH(''), TYPE).value('.', 'varchar(max)')
, 1, 1, '')
FROM Cte c1
GROUP BY c1.id, c1.name
ORDER BY c1.id, c1.name

Answer 2

SELECT ID, NAME,
RTRIM ((CASE WHEN Q1 IS NULL THEN 'Q1,' END)||
(CASE WHEN Q2 IS NULL THEN 'Q2,' END)||
(CASE WHEN Q3 IS NULL THEN 'Q3,' END)||
(CASE WHEN Q4 IS NULL THEN 'Q4,' END)||
(CASE WHEN Q5 IS NULL THEN 'Q5,' END)||
(CASE WHEN Q6 IS NULL THEN 'Q6,' END),',') AS NULL_QUESTIONS
FROM TABLE
EDIT: Added STUFF to get rid of the leading comma and added ELSE '':
SELECT ID, NAME,
STUFF (
CASE WHEN Q1 IS NULL THEN ',q1' ELSE '' END +
CASE WHEN Q2 IS NULL THEN ',q2' ELSE '' END +
CASE WHEN Q3 IS NULL THEN ',q3' ELSE '' END +
CASE WHEN Q4 IS NULL THEN ',q4' ELSE '' END +
CASE WHEN Q5 IS NULL THEN ',q5' ELSE '' END +
CASE WHEN Q6 IS NULL THEN ',q6' ELSE '' END
, 1,1,'') AS NULL_QUESTIONS
FROM Test

Answer 3

SELECT Panelist_ID, EmailAddress collate Latin1_General_CI_AI,
STUFF (
CASE WHEN convert (nvarchar (14), PQ_160175) IS NULL THEN ',PQ_160175' ELSE '' END +
CASE WHEN convert (nvarchar (14), PQ_161979) IS NULL THEN ',PQ_161979' ELSE '' END +
CASE WHEN convert (nvarchar (14), PQ_161980) IS NULL THEN ',PQ_161980' ELSE '' END +
CASE WHEN convert (nvarchar (14), PQ_161981) IS NULL THEN ',PQ_161981' ELSE '' END +
CASE WHEN convert (nvarchar (14), PQ_161982) IS NULL THEN ',PQ_161982' ELSE '' END +
CASE WHEN convert (nvarchar (14), PQ_161983) IS NULL THEN ',PQ_161983' ELSE '' END +
CASE WHEN convert (nvarchar (14), PQ_161986) IS NULL THEN ',PQ_161986' ELSE '' END +
CASE WHEN PQ_172469 IS NULL THEN ',PQ_172469' ELSE '' END +
CASE WHEN PQ_180972 IS NULL THEN ',PQ_180972' ELSE '' END +
CASE WHEN PQ_180973 IS NULL THEN ',PQ_180973' ELSE '' END +
CASE WHEN PQ_189924 IS NULL THEN ',PQ_189924' ELSE '' END +
CASE WHEN PQ_195859 IS NULL THEN ',PQ_195859' ELSE '' END +
CASE WHEN PQ_195860 IS NULL THEN ',PQ_195860' ELSE '' END +
CASE WHEN PQ_196605 IS NULL THEN ',PQ_196605' ELSE '' END +
CASE WHEN PQ_196606 IS NULL THEN ',PQ_196606' ELSE '' )
i have been using the aboce case statement and i am not able to see the output after 161983 nos