user: Question: What is the Release date for the Covered Song named " Sign O' the Times " by Prince .?
Columns: ['Album', 'Release date', 'Label', 'Format', 'Covered Song', 'Original Song']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Cover Version', 'March, 2003 June, 2005', 'Headphone Dust Tonefloat', 'CD 7" Single', '" Thank U " by Alanis Morissette .', '"Moment I Lost"']
SQL:

assistant: SELECT "Release date" FROM "Table" WHERE "Covered Song" = '" Sign O'' the Times " by Prince .';