user: Question: What was the format in September 1990 for Catalog 887 847-1?
Columns: ['Date', 'Label', 'Region', 'Format', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['12 September 1988', 'Polydor', 'France', '7" single', '887 847-7']
SQL:

assistant: SELECT "Format" FROM "Table" WHERE "Catalog" = '887 847-1' AND "Date" = 'September 1990';