CREATE TABLE table_12856 ("Designation" CLOB, "Launch date/time  (  GMT  ) " CLOB, "Mass" CLOB, "Apogee" CLOB, "Inclination" CLOB)

What is Mass, when Designation is Prognoz 2?
SELECT "Mass" FROM table_12856 WHERE "Designation" = 'prognoz 2'
SELECT "Mass" FROM "table_12856" WHERE "Designation" = 'prognoz 2'