"You cannot write well without data." (George Higgins)
Look at how all-encompassing that quote is. It's not limited to technical articles, instructional material or journalism. Heck, it's not even talking about SQL!
teAchnology lists the five main types of writing as: Expository, Descriptive, Narrative, Persuasive and Creative. According to the site, creative writing "doesn't necessarily need to follow any line of facts, just as long as it's interesting to read."
So even writing that doesn't rely on facts needs data...interesting.