contest_has_problem_sth => 'SELECT EXISTS(SELECT 1 FROM contest_problems WHERE contest = ? AND problem = ?)',
opens_sth => 'SELECT problem,owner,time FROM opens WHERE contest = ?',
problem_entry_sth => 'SELECT ' . (join ',', @{PROBLEM_PUBLIC_COLUMNS()}, 'statement', 'solution') . ' FROM problems WHERE id = ?',
limits_sth => 'SELECT format,timeout FROM limits WHERE problem = ?',
contest_has_problem_sth => 'SELECT EXISTS(SELECT 1 FROM contest_problems WHERE contest = ? AND problem = ?)',
opens_sth => 'SELECT problem,owner,time FROM opens WHERE contest = ?',
problem_entry_sth => 'SELECT ' . (join ',', @{PROBLEM_PUBLIC_COLUMNS()}, 'statement', 'solution') . ' FROM problems WHERE id = ?',
limits_sth => 'SELECT format,timeout FROM limits WHERE problem = ?',