CREATE TABLE table_204_128 (id DECIMAL, "region" TEXT, "date" TEXT, "label" TEXT, "format" TEXT, "catalog" TEXT)

how many more releases were in compact disc format than cassette tape ?
SELECT (SELECT COUNT(*) FROM table_204_128 WHERE "format" = 'compact disc') - (SELECT COUNT(*) FROM table_204_128 WHERE "format" = 'cassette tape')
WITH "_u_0" AS (SELECT COUNT(*), 'compact disc' AS "_u_1" FROM "table_204_128" GROUP BY 'compact disc'), "_u_2" AS (SELECT COUNT(*), 'cassette tape' AS "_u_3" FROM "table_204_128" GROUP BY 'cassette tape') SELECT COALESCE("_u_0"."", *) - COALESCE("_u_2"."", *) LEFT JOIN "_u_0" AS "_u_0" ON "_u_0"."_u_1" = "format" LEFT JOIN "_u_2" AS "_u_2" ON "_u_2"."_u_3" = "format"