user: Question: When was the person(s) who were canonised before 1988 beatified?
Columns: ['Name', 'Martyred', 'Place', 'Beatified', 'Canonised']
Types: ['text', 'real', 'text', 'real', 'real']
Sample row: ['Laurent-Marie-Joseph Imbert / St. Imbert', 1839.0, 'Korea', 1925.0, 1984.0]
SQL:

assistant: SELECT "Beatified" FROM "Table" WHERE "Canonised" < 1988.0;