Question: Does it need neutral wire when the power line and open source are no?
SQL: SELECT "Needs Neutral Wire?" FROM "2-184978-1" WHERE "Power Line" = 'no' AND "Open Source?" = 'no';

Question: Does Zigbee need neutral wire when the open source is yes?
SQL: SELECT "Needs Neutral Wire?" FROM "2-184978-1" WHERE "Open Source?" = 'yes' AND "Protocol" = 'Zigbee';

Question: What's the open source of X10 that no neutral wire needed?
SQL: SELECT "Open Source?" FROM "2-184978-1" WHERE "Needs Neutral Wire?" = 'no' AND "Protocol" = 'X10';