Question

我正在运行此查询。在大多数情况下它工作正常，但有一些记录有非数字部分，这会引起问题。我需要能够只选择整数的记录。

select distinct SUBSTRING(PAPROJNUMBER, 1, 5) AS STUDY_NUMBER
        FROM         dbo.PA01201 AS PA01201_1
        where PAPROJNUMBER>'0'

例如，结果列表的一部分如下所示：

我想要除7762A和LABOR之外的所有人。如何修改where子句以有效实现？

Answer 1

将“.0e0”添加到子字符串将确保ISNUMERIC仅返回有效的整数。

select distinct SUBSTRING(PAPROJNUMBER, 1, 5) AS STUDY_NUMBER
    FROM dbo.PA01201 AS PA01201_1
    where PAPROJNUMBER>'0'
        AND ISNUMERIC(SUBSTRING(PAPROJNUMBER, 1, 5) + '.0e0') = 1

Answer 2

您可以执行以下操作

SELECT
  SUBSTRING(PAPROJNUMBER, 1, 5) AS STUDY_NUMBER
FROM dbo.PA01201
WHERE SUBSTRING(PAPROJNUMBER, 1, 5) LIKE '[0-9][0-9][0-9][0-9][0-9]'

Answer 3

将ISNUMERIC（）添加到where子句：

select distinct SUBSTRING(PAPROJNUMBER, 1, 5) AS STUDY_NUMBER
from DBO.PA01201 AS PA01201_1
where PAPROJNUMBER > '0' AND ISNUMERIC(SUBSTRING(PAPROJNUMBER, 1, 5))

或者，您可以放弃>比较：

select distinct SUBSTRING(PAPROJNUMBER, 1, 5) AS STUDY_NUMBER
from DBO.PA01201 AS PA01201_1
where ISNUMERIC(SUBSTRING(PAPROJNUMBER, 1, 5))

获取仅为数字的记录

3 个答案: