what are the total number of student addresses in Texas state?
SELECT count ( T2.student_id )  FROM Addresses AS T1 JOIN Student_Addresses AS T2 ON T1.address_id  =  T2.address_id WHERE T1.state_province_county  =  "Texas"
total number of student addresses in Texas state refers to COUNT(T2.student_id) where T1.state_province_county = 'Texas';