user: Question: What is the Date when the label was Alfa Records, and a Catalog of ALCA-487?
Columns: ['Region', 'Date', 'Label', 'Format', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Japan', 'May 21, 1993', 'Alfa Records', 'CD', 'ALCA-487']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Label" = 'Alfa Records' AND "Catalog" = 'ALCA-487';