53 lines
2.2 KiB
Markdown
53 lines
2.2 KiB
Markdown
---
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title: SQL In Operator
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localeTitle: SQL In Operator
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---
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## SQL In Operator
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## IN运营商定义
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`IN`运算符用于`WHERE`或`HAVING` （作为`GROUP BY`一部分），以将所选行限制为列表中的项“IN”。
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以下是与`WHERE`子句结果集进行比较的当前完整学生列表：
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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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将显示在此列表中具有SAT分数的行（1000,2400）：
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```sql
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select studentID, FullName, sat_score, rcd_updated
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from student
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where sat_score in (1000, 2400);
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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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| 3 | Spencer Pautier | 1000 | 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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4 rows in set (0.00 sec)
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``` |