Execute sql task result set

Question

I am trying to count number of rows

SELECT COUNT(*) count
FROM table
group by col1,col2

and assign this to result set in execute sql task but am getting an error

[Execute SQL Task] Error: An error occurred while assigning a value to variable "numberofrowstoerror": "Single Row result set is specified, but no rows were returned.".

Answer 1

I've found that this has helped me with this problem in the past in "Execute SQL Task". If an SQL Task Editor expects results returned in a row … but there are no records to return then the following SQL fills a null return with a space. Note : can also be used to return zero if a numeric “return row” is expected

SELECT '' + ISNULL ((SELECT field FROM table WHERE (key = ?)), '') AS field