The Millers were never able to recover from conceding a seventh-minute goal and the Rams eased to the points.
Here is a numerical analysis of the game.
0 - The number of accurate crosses the Millers sent in from nine attempts.
0 - The number of corners the Millers forced in the 90 minutes as they failed to put Derby under any pressure.
0.64 - The number on average of points per game the Millers have registered this season.
1 - The number of away games the Millers have failed to score in this season after registering their first blank of the season at Derby.
1 - The number of points Neil Redfearn has registered in his first four games in charge.
2 - The number of games the Millers have failed to score in this season - their first blank since the 0-0 draw with Preston in August.
4 - The number of defeats the Millers have suffered at the iPro Stadium as they have never even registered a point in four visits to the Rams' new home.
4 - The number of key passes the Millers made in the 90 minutes as they struggles as an attacking force, compared to Derby's 13.
4 - The number of goals the Millers have conceded in minutes 40-45 this season after Jacob Butterfield's strike came at the wrong time.
5 - The number of games since the Millers last won.
5 - The number of away defeats the Millers have suffered from seven games on the road.
5 - The number of changes Redfearn made to his side, with Joe Mattock, Joe Newell, Danny Ward, Kirk Broadfoot and Rochie Smallwood coming into the side.
6 - The number of shots the Millers had one goal throughout the 90 minutes, though Rams goalkeeper Scott Carson was largely redundant.
7 - The number of games from the last nine which in-form Derby have won, drawing the other two.
7 - The number of games since Jonson Clarke-Harris - still the Millers' biggest threat - found the back of the net.
7 - The number of games since a frustrated Greg Halford last got on the pitch for the Millers, going back to the Brighton game in September.Derby v Rotherham: https://t.co/xLUDK84VLK via @YouTube— Rotherham United (@OfficialRUFC) November 1, 2015
8 - The number of times the Millers have gone in trailing at half-time this season.
9 - The number of times the Millers have conceded the first goal in games this season, only clawing one point back.
9 -The number of defeats the Millers have suffered from their 14 games, the joint highest in the division.
16 - The number of shots Derby peppered at Lee Camp's goal throughout the 90 minutes.
27 - The number of goals the Millers have conceded this season, the leakiest defence in the division.
50 - The number of years since the Millers last won away at Derby, going back to 1965 at the Baseball Ground.
594 - The number of combined minutes the Millers have been trailing this season.