Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_169693_1 ( age_30_39 INTEGER, age_20_29 VARCHAR )

### Question ###
Name the least age 30-39 where age 20-29 is 593

### Accurate SQL ###

SELECT MIN(age_30_39) FROM table_169693_1 WHERE age_20_29 = 593