CREATE TABLE table_201_25 (id NUMBER, "party" CLOB, "leader" CLOB, "from" CLOB, "to" CLOB)

what is the total number of years gordon wallace and robert cunning spent in office .
SELECT SUM("to" - "from") FROM table_201_25 WHERE "leader" IN ('gordon wallace', 'robert cunning')
SELECT SUM("to" - "from") FROM "table_201_25" WHERE "leader" IN ('gordon wallace', 'robert cunning')