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Check the below input data and expected output to find the name of the column which has all NULL records.
Input Data:
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COL1 COL2 COL3 ----------- ----------- ----------- 1 NULL 2 1 NULL 2 1 NULL 2 1 NULL 2 1 NULL 2 |
Expected Output:
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NullColumn ------------ COL2 |
Create a sample table with data:
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CREATE TABLE tbl_ids ( COL1 INT ,COL2 INT ,COL3 INT ) GO INSERT INTO tbl_ids VALUES (1,NULL,2) ,(1,NULL,2) ,(1,NULL,2) ,(1,NULL,2) ,(1,NULL,2) GO |
Solution:
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SELECT CONCAT ( MAX(CASE WHEN COL1 IS NULL THEN 'COL1' ELSE '' END ) ,MAX(CASE WHEN COL2 IS NULL THEN 'COL2' ELSE '' END ) ,MAX(CASE WHEN COL3 IS NULL THEN 'COL3' ELSE '' END ) ) NullColumn FROM tbl_ids |
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