CREATE TABLE table_6115 ("Name" TEXT, "Birth" TEXT, "Marriage" TEXT, "Became Queen" TEXT, "Ceased to be Queen" TEXT, "Death" TEXT, "Spouse" TEXT)

How is the marriage of who became queen on 30 October 1816 husband's accession?
SELECT "Marriage" FROM table_6115 WHERE "Became Queen" = '30 october 1816 husband''s accession'
SELECT "Marriage" FROM "table_6115" WHERE "Became Queen" = '30 october 1816 husband\'s accession'