The Multi_Case function extends the capability of the SQL CASE statement by supporting matches to multiple criteria in a single row.
When SQL CASE finds a match, it outputs the result and immediately proceeds to the next row without searching for more matches in the current row.
The Multi_Case function iterates through the input data set only once and outputs matches whenever a match occurs. If multiple matches occur for a given input row, the function outputs one output row for each match.
Use the Multi_Case function when the conditions in your CASE statement do not form a mutually exclusive set.