CREATE TABLE table_20870 ("Player" TEXT, "No." FLOAT, "Nationality" TEXT, "Position" TEXT, "Years for Grizzlies" TEXT, "School/Club Team" TEXT)

What number does the player who was with the grizzles in 1999 wear?
SELECT MIN("No.") FROM table_20870 WHERE "Years for Grizzlies" = '1999'
SELECT MIN("No.") FROM "table_20870" WHERE "Years for Grizzlies" = '1999'