子句类别 | 简单 | 中等 | 困难 | 特别困难 |
select | 90.5 | 57.0 | 80.3 | 55.0 |
where | 64.9 | 54.2 | 48.1 | 68.8 |
group | 100.0 | 100.0 | 100.0 | 66.7 |
order | 100.0 | 60.0 | 43.9 | 52.6 |