CREATE TABLE table_42952 ("Year" FLOAT, "Actor" TEXT, "Award" TEXT, "Motion Picture" TEXT, "Result" TEXT)

For what motion picture did Samuel L. Jackson win the best supporting actor award before 1997?
SELECT "Motion Picture" FROM table_42952 WHERE "Award" = 'best supporting actor' AND "Actor" = 'samuel l. jackson' AND "Year" < '1997'
SELECT "Motion Picture" FROM "table_42952" WHERE "Actor" = 'samuel l. jackson' AND "Award" = 'best supporting actor' AND "Year" < '1997'