user: Question: Name the period active for Enya
Columns: ['Artist', 'Country of origin', 'Period active', 'Release-year of first charted record', 'Genre', 'Claimed sales']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['The Black Eyed Peas', 'United States', '1995–present', 1998.0, 'Hip-hop / R&B / Dance', '76 million']
SQL:

assistant: SELECT "Period active" FROM "Table" WHERE "Artist" = 'Enya';