CREATE TABLE table_name_30 (pages NUMBER, vol__number VARCHAR2, isbn VARCHAR2)

How many pages does the edition with a volume # smaller than 8 and an ISBM of 1-40122-892-5 have?
SELECT SUM(pages) FROM table_name_30 WHERE vol__number < 8 AND isbn = "1-40122-892-5"
SELECT SUM("pages") FROM "table_name_30" WHERE "1-40122-892-5" = "isbn" AND "vol__number" < 8