CREATE TABLE table_204_163 (id NUMBER, "airline" CLOB, "icao" CLOB, "iata" CLOB, "callsign" CLOB, "commenced\ operations" NUMBER)

what is the difference between the time air uganda commenced operations and skyjet airlines commenced operations ?
SELECT ABS((SELECT "commenced\noperations" FROM table_204_163 WHERE "airline" = 'air uganda') - (SELECT "commenced\noperations" FROM table_204_163 WHERE "airline" = 'skyjet airlines'))
SELECT ABS((SELECT "commenced\noperations" FROM "table_204_163" WHERE "airline" = 'air uganda') - (SELECT "commenced\noperations" FROM "table_204_163" WHERE "airline" = 'skyjet airlines'))