CREATE TABLE table_6244 ("Windows" CLOB, "Mac OS X" CLOB, "Linux" CLOB, "Other Unix" CLOB, "AmigaOS" CLOB, "Android" CLOB, "Windows Mobile" CLOB)

Which Android has anOther Unix of unknown?
SELECT "Android" FROM table_6244 WHERE "Other Unix" = 'unknown'
SELECT "Android" FROM "table_6244" WHERE "Other Unix" = 'unknown'