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

### Instruction:
when was it commissioned when the destroyer was built by scotts, greenock?

### Inputs:
table_name: table, columns: ['Name', 'Pennant', 'Builder', 'Laid Down', 'Launched', 'Commissioned']

### Response:
SELECT Commissioned FROM table WHERE Builder = scotts, greenock