ผู้ป่วยหญิงมี SDH เป็นโรคหลักกี่คน?ไม่จำเป็นต้องใช้ตารางทั้งหมด
how many of the female patients had sdh as the primary disease?It is not neccessary to use all the tables.
 procedures:  subject_id [ text]  hadm_id [ text]  icd9_code [ text]  short_title [ text]  long_title [ text] 
SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic WHERE demographic.gender = "F" AND demographic.diagnosis = "SDH"