Question: What date has 0-6700-30838-2-9 for a catalog?
SQL: SELECT "Date" FROM "2-18908421-5" WHERE "Catalog" = '0-6700-30838-2-9';

Question: What's the date in the United Kingdom having a catalog of Reveal50CD/LP?
SQL: SELECT "Date" FROM "2-18908421-5" WHERE "Catalog" = 'Reveal50CD/LP' AND "Region" = 'United Kingdom';