CREATE TABLE "nintendo_ds" (
  "name" text,
  "current_version" text,
  "system" text,
  "platform" text,
  "license" text
);

Question: What platform is nds4droid on for the nintendo ds?
SQL: SELECT "platform" FROM "nintendo_ds" WHERE "system"='nintendo ds' AND "name"='nds4droid';

Question: Who has a license of proprietary (available on inquiry)?
SQL: SELECT "name" FROM "nintendo_ds" WHERE "license"='proprietary (available on inquiry)';

Question: What platform is nds4droid on for the nintendo ds with a license of gpl v2?
SQL: SELECT "platform" FROM "nintendo_ds" WHERE "system"='nintendo ds' AND "license"='gpl v2' AND "name"='nds4droid';

Question: What system has a current version of 1.4e?
SQL: SELECT "system" FROM "nintendo_ds" WHERE "current_version"='1.4e';

Question: Who has a licence of gpl v2 and a current version of 0.9.9?
SQL: SELECT "name" FROM "nintendo_ds" WHERE "license"='gpl v2' AND "current_version"='0.9.9';