CREATE TABLE table_name_21 (score VARCHAR2, visitor VARCHAR2, date VARCHAR2)

What is the score of the game with Grizzlies as the visitor team on 30 December 2007?
SELECT score FROM table_name_21 WHERE visitor = "grizzlies" AND date = "30 december 2007"
SELECT "score" FROM "table_name_21" WHERE "30 december 2007" = "date" AND "grizzlies" = "visitor"