将多个列与Teradata合并在一起

Question

I have 10 columns and their values could be either null, or a name of a fruit.

I would like to add another column with all the fruits that every row has. I have used Concat(column1 , column2,..., column10) as name.

Issue : There are no commas coming on the result and if I add the comma before concatenating, we are having them together, the last word is also a comma.

Any ideas?

Thanks!

Answer 1

You can use the standard concatenation (||) in conjunciton with COALESCE function, which returns the value of the first non-null argument.

Example:

select coalesce(column1||',', '')||coalesce(column2||',', '')|| ... ||coalesce(column10||, '');