CREATE TABLE table_3144 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight" TEXT, "Jockey" TEXT, "Winner/2nd" TEXT)

What was the weight of the jockey at Sandown Park?
SELECT "Weight" FROM table_3144 WHERE "Venue" = 'Sandown Park'
SELECT "Weight" FROM "table_3144" WHERE "Venue" = 'Sandown Park'