user: ### NOW ANSWER:
Question: Name the least age 30-39 where age 20-29 is 593
Columns: ['Date of Sterilization', 'Age 10-19', 'Age 20-29', 'Age 30-39', 'Age 40-49', 'Age 50-59', 'Age Unknown', 'Total']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Jan 1929 - Jun 1935', 87.0, 87.0, 42.0, 4.0, 2.0, 1.0, 223.0]
SQL:

assistant: SELECT MIN("Age 30-39") FROM "Table" WHERE "Age 20-29" = 593.0;