If I understood correctly you want to only join both tables?
If so, its quite simple and possible to do in Qlik Sense Desktop.
1. Load the data from excel spreadsheet.
2. Create a connection to your database to load the db data.
3. See the common fields you wants to join both tables
4. Use the join statement to create a single table with all the fields you want.
5. Enjoy your new table .
That's it mostly and since you didn't share enough information as to fields / tables you have or how you want to join them, here's a link of Qlik Help with some examples you can use to do so: