Report error for certain users

Question

I am having an issue with a report where an error occurs randomly. Here is the simplified run down of the issue.
I have a SRS report loaded to 2008 SRS instance that has 1 dataset that runs a stored procedure which then populates a table in a report. The database is a replicated version of our test database but the OLTP database has not been updated so the data is
the same and has not been changed. I have run the report 100's of times and every time is works perfectly. However a customer of mine runs it and once in a while they get the following error message, "sub query returns more than 1
value, This is not permitted when the sub query follows....". To me this points to a SQL query issue. However if I use the same parameters the customer is using no such error occurs. I have ran their parameters through both the
stored procedure directly and through the report UI and I cant reproduce the errors. Running SQL profiler doesn't reveal anything.  I am running out of options so I would like to hear if anyone has any suggestions. I can provide further details if
needed.

Answer 1

Hi blkPony,
According to your description, there is a SSRS report of SQL Server 2008, it retrieves data from a stored procedure. When customers run the report, they get the error message: sub query returns more than 1 value, this is not permitted when the sub query
follows....
According to the error message, there is subquery in the procedure, something like below:
Select * from orders where customer_id = (select customer_id from customer where name ='Bob')
The cause of the issue is that subquery in the procedure returns multiple rows. If there is more than one customer named Bob, there will be more than on customer_id returned, so the “=” operator won't work. To fix the issue, we can use in instead of “=”
or use TOP 1 to return only one value.
Here is a relevant thread you can reference:
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/18d8b92c-f3d5-4b19-a020-46cc94813158/subquery-returned-more-than-1-value-this-is-not-permitted-when-the-subquery-follows-?forum=transactsql
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu
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