CREATE TABLE table_50940 ("Senator" TEXT, "Party" TEXT, "District" FLOAT, "Home Town" TEXT, "Took Office" FLOAT)

Which Senator has a Party of republican, a Home Town of houston, and a District of 7?
SELECT "Senator" FROM table_50940 WHERE "Party" = 'republican' AND "Home Town" = 'houston' AND "District" = '7'
SELECT "Senator" FROM "table_50940" WHERE "District" = '7' AND "Home Town" = 'houston' AND "Party" = 'republican'