61 lines
2.5 KiB
Markdown
61 lines
2.5 KiB
Markdown
---
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title: SQL Order By Keyword
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localeTitle: SQL按顺序排序
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---
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## SQL按顺序排序
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### 订购方式（ASC，DESC）
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ORDER BY为我们提供了一种方法，可以通过SELECT部分中的一个或多个项来对结果集进行排序。这是一个按FullName降序排列学生的SQL。默认排序顺序是升序（ASC），但要按相反顺序（降序）排序，请使用DESC。
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```sql
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SELECT studentID, FullName, sat_score
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FROM student
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ORDER BY FullName DESC;
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```
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```text
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+-----------+------------------------+-----------+
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| studentID | FullName | sat_score |
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+-----------+------------------------+-----------+
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| 2 | Teri Gutierrez | 800 |
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| 3 | Spencer Pautier | 1000 |
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| 6 | Sophie Freeman | 1200 |
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| 9 | Raymond F. Boyce | 2400 |
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| 1 | Monique Davis | 400 |
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| 4 | Louis Ramsey | 1200 |
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| 7 | Edgar Frank "Ted" Codd | 2400 |
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| 8 | Donald D. Chamberlin | 2400 |
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| 5 | Alvin Greene | 1200 |
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+-----------+------------------------+-----------+
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9 rows in set (0.00 sec)
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```
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_这是与上述相比较的UN-ORDERED，当前，完整学生列表。_
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```sql
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SELECT studentID, FullName, sat_score, rcd_updated FROM student;
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```
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```text
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+-----------+------------------------+-----------+---------------------+
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| studentID | FullName | sat_score | rcd_updated |
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+-----------+------------------------+-----------+---------------------+
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| 1 | Monique Davis | 400 | 2017-08-16 15:34:50 |
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| 2 | Teri Gutierrez | 800 | 2017-08-16 15:34:50 |
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| 3 | Spencer Pautier | 1000 | 2017-08-16 15:34:50 |
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| 4 | Louis Ramsey | 1200 | 2017-08-16 15:34:50 |
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| 5 | Alvin Greene | 1200 | 2017-08-16 15:34:50 |
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| 6 | Sophie Freeman | 1200 | 2017-08-16 15:34:50 |
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| 7 | Edgar Frank "Ted" Codd | 2400 | 2017-08-16 15:35:33 |
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| 8 | Donald D. Chamberlin | 2400 | 2017-08-16 15:35:33 |
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| 9 | Raymond F. Boyce | 2400 | 2017-08-16 15:35:33 |
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+-----------+------------------------+-----------+---------------------+
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9 rows in set (0.00 sec)
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```
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与所有这些SQL事物一样，它们比本入门指南中的内容更多。
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我希望这至少足以让你开始。
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请参阅您的数据库管理员手册，并自己尝试不同的选项。 |