CREATE TABLE table_203_429 (id NUMBER, "year" NUMBER, "competition" CLOB, "venue" CLOB, "position" CLOB, "notes" CLOB)

how many world championships has he been in ?
SELECT COUNT(*) FROM table_203_429 WHERE "competition" = 'world championships'
SELECT COUNT(*) FROM "table_203_429" WHERE "competition" = 'world championships'