how many times did they participate in the world championships ?
CREATE TABLE table_203_28 (
    id number,
    "year" number,
    "competition" text,
    "venue" text,
    "position" text,
    "event" text,
    "notes" text
)
SELECT COUNT(*) FROM table_203_28 WHERE "competition" = 'world championships'
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 times did they participate in the world championships ? ### Input: CREATE TABLE table_203_28 (
    id number,
    "year" number,
    "competition" text,
    "venue" text,
    "position" text,
    "event" text,
    "notes" text
) ### Response: SELECT COUNT(*) FROM table_203_28 WHERE "competition" = 'world championships'