# Quiz

__*LIMIT 子句*__

+ 你对在以下执行计划中的哪个部分最感兴趣? 为什么?
+ 尝试回答以下问题:
  + 你实际需要多少行？ 
  + 每个步骤处理多少行？

```8
tidb> EXPLAIN SELECT name FROM universe.planets ~!@LIMIT 8,1@!~;
+----------------------------+---------+-----------+---------------------------------+--------------------------------+
| id                         | estRows | task      | access object                   | operator info                  |
+----------------------------+---------+-----------+---------------------------------+--------------------------------+
| Limit_7                    | 1.00    | root      |                                 | offset:8, count:1              |
| └─IndexReader_12           | 9.00    | root      |                                 | index:Limit_11                 |
|   └─Limit_11               | 9.00    | cop[tikv] |                                 | offset:0, count:9              |
|     └─IndexFullScan_10     | 9.00    | cop[tikv] | table:planets, index:name(name) | keep order:false, stats:pseudo |
+----------------------------+---------+-----------+---------------------------------+--------------------------------+
4 rows in set (0.00 sec)
```
-------------------------------------------------------------
尝试回答以下问题。
1) 你实际需要多少行？ 1
2) 每个步骤处理多少行？9, 9, 9, 1

有关执行计划的更多信息,请参阅：`https://docs.pingcap.com/tidb/stable/explain-overview`