user: Question: What is the earliest date of taking office for district 22?
Columns: ['Senator', 'Party', 'District', 'Home Town', 'Took Office']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Bill Ratliff', 'Republican', 1.0, 'Mount Pleasant', 1989.0]
SQL:

assistant: SELECT MIN("Took Office") FROM "Table" WHERE "District" = 22.0;