Further to my other reply, I've just checked the intertubes, and found that Codd's paper "A Relational Model of Data for Large Shared Data Banks" was published in 1970, and Dijkstra's "Go To Statement Considered Harmful" in 1968. So I think my fading memories of all this are accurate (for once!).
Yes indeed. I haven't checked his research dates, but I was writing database software in the late (uh) 60s and early 70s. I think that was even before "goto harmful". I still remember our standards officer saying, let's try some of this structured programming stuff!