CREATE TABLE protein (institution_id VARCHAR)
CREATE TABLE building (building_id VARCHAR, floors VARCHAR)
CREATE TABLE institution (institution_id VARCHAR, building_id VARCHAR)

How many proteins are associated with an institution in a building with at least 20 floors?
SELECT COUNT(*) FROM institution AS T1 JOIN protein AS T2 ON T1.institution_id = T2.institution_id JOIN building AS T3 ON T3.building_id = T1.building_id WHERE T3.floors >= 20
SELECT COUNT(*) FROM "institution" AS "T1" JOIN "protein" AS "T2" ON "T1"."institution_id" = "T2"."institution_id" JOIN "building" AS "T3" ON "T1"."building_id" = "T3"."building_id" AND "T3"."floors" >= 20