Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the previous conference for the school that joined in 2000 with a millers mascot?

### Inputs:
table_name: table, columns: ['School', 'Location', 'Mascot', 'County', '2013-2014 Size', 'Year Joined', 'Previous Conference']

### Response:
SELECT Previous Conference FROM table WHERE Year Joined = 2000 AND Mascot = millers