-- Database schema
| works_on : Essn [ INT ] primary_key , Pno [ INT ] , Hours [ INT ] | employee : Fname [ TEXT ] , Minit [ TEXT ] , Lname [ TEXT ] , Ssn [ INT ] primary_key , Bdate [ TEXT ] , Address [ TEXT ] , Sex [ TEXT ] , Salary [ INT ] , Super_ssn [ INT ] , Dno [ INT ] | department : Dname [ TEXT ] , Dnumber [ INT ] primary_key , Mgr_ssn [ INT ] , Mgr_start_date [ TEXT ] | project : Pname [ TEXT ] , Pnumber [ INT ] primary_key , Plocation [ TEXT ] , Dnum [ INT ] | dependent : Essn [ INT ] primary_key , Dependent_name [ TEXT ] , Sex [ TEXT ] , Bdate [ TEXT ] , Relationship [ TEXT ] | dept_locations : Dnumber [ INT ] primary_key , Dlocation [ TEXT ] |
-- -- how many female dependents are there?

SELECT count(*) FROM dependent WHERE sex  =  'F';