how to replace blanks with values from another column

Hi All,

I am trying to populate blank cell with a value from another column, i.e.

if 'country' is blank then populate with a value from 'country_1'

I tried the below, but it doesn't seem to work.

CASE

WHEN LENGTH(`Country`)=0
THEN `Country_1`

END

Please help!

Thanks

Max

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IFNULL (`country`, `country_1`)

The previously proposed formula will fix your issue, however if you need to use case statement (for another reason) the following should work I think

CASE

WHEN TRIM(`Country`) = ''
THEN `Country_1`

ELSE `Country`

END

might want to use a case statement for blanks and nulls.

Case when trim(`country`) = '' or `country` is null then `country` else `country` end