user: Question: what is the competing entities when the age group is 18 or younger, held every is One year and the sport is Table tennis?
Columns: ['Sport', 'Competition name', 'Competing entities', 'Age groups', 'Held every']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Aquatics', 'FINA World Junior Swimming Championships', 'Individuals [R ]', '17 or younger', 'Two years']
SQL:

assistant: SELECT "Competing entities" FROM "Table" WHERE "Age groups" = '18 or younger' AND "Held every" = 'One year' AND "Sport" = 'Table tennis';