CREATE TABLE table_204_154 (id DECIMAL, "player" TEXT, "matches" DECIMAL, "innings" DECIMAL, "runs" DECIMAL, "average" DECIMAL, "100s" DECIMAL, "50s" DECIMAL)

how many more runs does john have than albert ?
SELECT (SELECT "runs" FROM table_204_154 WHERE "player" = 'john challen') - (SELECT "runs" FROM table_204_154 WHERE "player" = 'albert clapp')
SELECT (SELECT "runs" FROM "table_204_154" WHERE "player" = 'john challen') - (SELECT "runs" FROM "table_204_154" WHERE "player" = 'albert clapp')