将格式编号的列检查添加到oracle编号

我需要向表中添加一列，检查输入是否为999到999的最大值，如足球比赛分数。我该如何写这份声明

例如：

 | Score |
 ---------
 | 1-2   |
 | 10-1  |
 |999-999|
 | 99-99 |

Oracle 11g R2架构设置：

CREATE TABLE SCORES (Score ) AS
          SELECT '1-2' FROM DUAL
UNION ALL SELECT '10-1' FROM DUAL
UNION ALL SELECT '999-999' FROM DUAL
UNION ALL SELECT '99-99' FROM DUAL
UNION ALL SELECT '1000-1000' FROM DUAL;

SELECT SCORE,
       CASE WHEN REGEXP_LIKE( SCORE, '^\d{1,3}-\d{1,3}$' )
            THEN 'Valid'
            ELSE 'Invalid'
            END AS Validity
FROM   SCORES

|     SCORE | VALIDITY |
|-----------|----------|
|       1-2 |    Valid |
|      10-1 |    Valid |
|   999-999 |    Valid |
|     99-99 |    Valid |
| 1000-1000 |  Invalid |

查询1：

CREATE TABLE SCORES (Score ) AS
          SELECT '1-2' FROM DUAL
UNION ALL SELECT '10-1' FROM DUAL
UNION ALL SELECT '999-999' FROM DUAL
UNION ALL SELECT '99-99' FROM DUAL
UNION ALL SELECT '1000-1000' FROM DUAL;

SELECT SCORE,
       CASE WHEN REGEXP_LIKE( SCORE, '^\d{1,3}-\d{1,3}$' )
            THEN 'Valid'
            ELSE 'Invalid'
            END AS Validity
FROM   SCORES

|     SCORE | VALIDITY |
|-----------|----------|
|       1-2 |    Valid |
|      10-1 |    Valid |
|   999-999 |    Valid |
|     99-99 |    Valid |
| 1000-1000 |  Invalid |

：

CREATE TABLE SCORES (Score ) AS
          SELECT '1-2' FROM DUAL
UNION ALL SELECT '10-1' FROM DUAL
UNION ALL SELECT '999-999' FROM DUAL
UNION ALL SELECT '99-99' FROM DUAL
UNION ALL SELECT '1000-1000' FROM DUAL;

SELECT SCORE,
       CASE WHEN REGEXP_LIKE( SCORE, '^\d{1,3}-\d{1,3}$' )
            THEN 'Valid'
            ELSE 'Invalid'
            END AS Validity
FROM   SCORES

|     SCORE | VALIDITY |
|-----------|----------|
|       1-2 |    Valid |
|      10-1 |    Valid |
|   999-999 |    Valid |
|     99-99 |    Valid |
| 1000-1000 |  Invalid |

---

为什么要将其存储为单个字符串列，而不是两个数字列，这可能需要频繁解析？我知道这没有意义，但我是一名学生，问题要求以这种方式编写。请帮忙，你试过什么？如果我被迫这样做，我会使用正则表达式。不知道你的课程是否涵盖了这一点，也不知道它是否希望你使用较旧的

instr

和

substr

函数。前几天有人做了这个作业。尝试搜索。