Table: js_editor_comparison
Columns: editor
site
style_clone_of
cost_us
open_source
activity

Question: Which source has a Cost free, and an Activity of some, and an Editor of markitup?
SQL: SELECT "open_source" FROM js_editor_comparison WHERE "cost_us" = 'free' AND "activity" = 'some' AND "editor" = 'markitup'

Question: Which site has a Cost free and a Editor of jsvi?
SQL: SELECT "site" FROM js_editor_comparison WHERE "cost_us" = 'free' AND "editor" = 'jsvi'

Question: What is the cost of an Open Source that is no?
SQL: SELECT "cost_us" FROM js_editor_comparison WHERE "open_source" = 'no'