Selecting Query Items

I currently have a list of drop down inputs that will run a query on a table. I want to put a check box next to these drop downs and for the query to only run on the items selcted. I currently have an SQL query binded to the table data. SELECT collumns FROM table WHERE (values = dropdown.selectedStringValue)

Also, Is there a way to select part/all of the options in the dropdown input?

thanks!

Not with the dropdown component. However, you should use the list component under the Tables tab. That allows multiple selections.