user: Question: What is the original air date for "Rock-a-Bye-Baby"?
Columns: ['Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series.', 'Series No.', 'Episode', 'Director', 'Writer(s)', 'Original airdate']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [16.0, 1.0, '"A Little Lobbying"', 'Antonia Bird', 'Jeremy Brock and Paul Unwin', '12September1987']
SQL:

assistant: SELECT "Original airdate" FROM "Table" WHERE "Episode" = '"Rock-a-Bye-Baby"';