How many entries are there for weight when the winner is 1st - defier and venue is randwick?
CREATE TABLE table_18864 (
    "Result" text,
    "Date" text,
    "Race" text,
    "Venue" text,
    "Group" text,
    "Distance" text,
    "Weight (kg)" text,
    "Time" text,
    "Jockey" text,
    "Winner/2nd" text
)
SELECT COUNT("Weight (kg)") FROM table_18864 WHERE "Winner/2nd" = '1st - Defier' AND "Venue" = 'Randwick'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many entries are there for weight when the winner is 1st - defier and venue is randwick? ### Input: CREATE TABLE table_18864 (
    "Result" text,
    "Date" text,
    "Race" text,
    "Venue" text,
    "Group" text,
    "Distance" text,
    "Weight (kg)" text,
    "Time" text,
    "Jockey" text,
    "Winner/2nd" text
) ### Response: SELECT COUNT("Weight (kg)") FROM table_18864 WHERE "Winner/2nd" = '1st - Defier' AND "Venue" = 'Randwick'