user: ### NOW ANSWER:
Question: What are Unit 2's dates of commissioning?
Columns: ['Stage', 'Unit Number', 'Installed Capacity ( MW )', 'Date of Commissioning', 'Status', 'TG set Provider', 'Boiler Provider']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['First', 1.0, '62.5', 'October,1967', 'Running', 'GE , USA', 'The Babcock & Wilcox Company (B&W), USA']
SQL:

assistant: SELECT COUNT("Date of Commissioning") FROM "Table" WHERE "Unit Number" = 2.0;