CREATE TABLE table_203_447 (id NUMBER, "constituency" NUMBER, "region" CLOB, "name" CLOB, "party" CLOB, "last elected" NUMBER)

what is the difference in years between constiuency 1 and 2 ?
SELECT (SELECT "last elected" FROM table_203_447 WHERE "constituency" = 1) - (SELECT "last elected" FROM table_203_447 WHERE "constituency" = 2)
SELECT (SELECT "last elected" FROM "table_203_447" WHERE "constituency" = 1) - (SELECT "last elected" FROM "table_203_447" WHERE "constituency" = 2)