CREATE TABLE table_204_843 (id NUMBER, "volume" NUMBER, "year" CLOB, "names" CLOB, "articles" NUMBER, "pages" NUMBER, "images" NUMBER, "maps" NUMBER, "number of copies" NUMBER)

how many articles were published in the 6th volume ?
SELECT "articles" FROM table_204_843 WHERE "volume" = 6
SELECT "articles" FROM "table_204_843" WHERE "volume" = 6