Thanks for all posts. I respond to the others tomorrow.
Answer to your requests: simplest would probably be to cast the text column to a number type (if it only contains number data) in the query.
If it were normal SQL, your suggestion would definitely work.
Unfortunately, this data is from DynamoDB (via a CData JDBC driver driver) which doesn't support the cast function. I guess I can try the Custom Schema settings to see if I can map the seqNumber to a numeric data type.
Thank you, though, for the suggestion and the quick reply.
For aggregations of selections, you provide the ability to treat numbers stored in a text field as numeric values.
Could you also do the same to allow numeric sorting on a text column containing numbers in a query results tab? This would be extremely useful.