CREATE TABLE student (stuid VARCHAR)
CREATE TABLE lives_in (stuid VARCHAR, dormid VARCHAR)
CREATE TABLE dorm (dormid VARCHAR, gender VARCHAR)

Find the total number of students living in the male dorm (with gender M).
SELECT COUNT(*) FROM student AS T1 JOIN lives_in AS T2 ON T1.stuid = T2.stuid JOIN dorm AS T3 ON T3.dormid = T2.dormid WHERE T3.gender = 'M'
SELECT COUNT(*) FROM "student" AS "T1" JOIN "lives_in" AS "T2" ON "T1"."stuid" = "T2"."stuid" JOIN "dorm" AS "T3" ON "T2"."dormid" = "T3"."dormid" AND "T3"."gender" = 'M'