sql - CASE: WHEN column1 IS NULL THEN write column2 -


is possible show data column if checked column null?

for example:

  • columns: color, originalcolor

  • table: tablecolors [color, originalcolor]

    [w, b] [ , g] [b, y]

and 

select case when color null "extract data originalcolor" tablecolors

should following list: w, g, b

could looking coalesce? function return first non-null value.

select coalesce(`color`, `originalcolor`) `color` `tablecolors`;

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