CREATE TABLE table_64809 ("Class" CLOB, "Railway number ( s ) " CLOB, "DRG number ( s ) " CLOB, "Quantity" FLOAT, "Year ( s )  of manufacture" CLOB, "Axle arrangement  (  UIC  )  Bauart" CLOB)

What is average quantity, when DRG number is 99 011?
SELECT AVG("Quantity") FROM table_64809 WHERE "DRG number(s)" = '99 011'
SELECT AVG("Quantity") FROM "table_64809" WHERE "DRG number(s)" = '99 011'