select CASE WHEN FirstColumn IS NULL THEN '' ELSE FirstColumn END + ' ' +
CASE WHEN SecondColumn IS NULL THEN '' ELSE SecondColumn END as ResultColumn
from myTable

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That works. Also there is TSQL's ISNULL function.

SELECT 
    ISNULL(FirstColumn, '') + ' ' + ISNULL(SecondColumn, '') AS ResultColumn
FROM 
    mytable

Yeah there is also COALESCE(columnName,'')

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