Table: canada_tallest_buildings
Columns: building
height_m
floors
built
city
architect

Question: Who was the architect of the 10 floor building with a height of 42 M?
SQL: SELECT "architect" FROM canada_tallest_buildings WHERE "height_m" = 42 AND "floors" = 10

Question: What is the height of the building built by architects Ross and Macfarlane?
SQL: SELECT "height_m" FROM canada_tallest_buildings WHERE "architect" = 'ross and macfarlane'

Question: Who was the architect that built the Electric Railway Chambers before 1915?
SQL: SELECT "architect" FROM canada_tallest_buildings WHERE "built" < 1915 AND "building" = 'electric railway chambers'