fixes after code review

appB.jl

@@ -186,6 +186,8 @@ proptable([walk_unique_2ahead() for _ in 1:10^5])
 # Code for exercise 11.1
 
 @time wide = DataFrame(ones(1, 10_000), :auto);
+@time wide = DataFrame(ones(1, 10_000), :auto);
+@time Tables.columntable(wide);
 @time Tables.columntable(wide);
 
 # Code for exercise 11.2

ch09.jl

@@ -88,8 +88,6 @@ df1 = puzzles[:, ["Rating", "Popularity"]];
 df2 = puzzles[!, ["Rating", "Popularity"]];
 
 df1 == df2
-df1 == puzzles
-df2 == puzzles
 
 df1.Rating === puzzles.Rating
 df1.Popularity === puzzles.Popularity