CREATE TABLE table_20434 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " TEXT, "Time" TEXT, "Jockey" TEXT, "Winner/2nd" TEXT)

What is the entry for weight in kilograms of jockey D. Nikolic?
SELECT "Weight (kg)" FROM table_20434 WHERE "Jockey" = 'D. Nikolic'
SELECT "Weight (kg)" FROM "table_20434" WHERE "Jockey" = 'D. Nikolic'