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can i get 'colNew_name' from a select query like table below?

original table:

category_name | col1_name  | col2_name  | 
:------------ | :--------- | :----------|
postgres      | 1          | null       |
SAM           | null       | 1          |
MariaDB       | 1          | 1          |

result table:

category_name | col1_name  | col2_name  |      colNew_name   |
:------------ | :--------- | :----------| :------------------|
postgres      | 1          | null       |     col1_name      |
SAM           | null       | 1          |     col2_name      |
MariaDB       | 1          | 1          | col1_name,col2_name|

1 Answer 1

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If your list of columns is small and fixed you could always do:

SELECT *, 
       CONCAT_WS(',', 
                 CASE WHEN col1_name IS NULL THEN NULL ELSE 'col1_name' END,
                 CASE WHEN col2_name IS NULL THEN NULL ELSE 'col2_name' END)
       AS "colNew_name"
FROM table1

See http://sqlfiddle.com/#!15/a88af8/2

3
  • thanks ...but list is around 42 columns, any other suggestions? May 31, 2018 at 17:22
  • Give all your real contraints in the body of your question, if you want answers tailored to your situation. Your original table example has only 2 columns... so difficult to imagine that your real life case has 42 columns... May 31, 2018 at 17:26
  • I wrote this large query and it works for my ,in future questions i'll add all constraints,...thanks again May 31, 2018 at 20:22

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