user: Question: What is the Competition when the Club was Costa Rica U-20?
Columns: ['Year', 'Competition', 'Club', 'Nation', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2010.0, 'Preseason', 'Club Universidad de Guadalajara', 'Mexico', 'W 0–1']
SQL:

assistant: SELECT "Competition" FROM "Table" WHERE "Club" = 'Costa Rica U-20';