ORACLE SUBSTR编号类型

Question

I have a query that uses the following in a select statement 我有一个在select语句中使用以下内容的查询

WHERE section_id=SUBSTR(:rId, 5, 6)

where rId is N00401E 其中rId为N00401E

Thus I am extracting the 5th and 6th characters, "01" from the rId. 因此，我从rId中提取了第5和第6个字符“ 01”。

The error I'm getting is ORA-01722: invalid number 我收到的错误是ORA-01722：无效的数字

The rId has a type number (2) rId具有类型编号（2）

I've tried TO_NUMBER but this is not working. 我已经尝试过TO_NUMBER，但这不起作用。 Can anyone help? 有人可以帮忙吗？

Answer 1

To extract characters 5 an 6 you should: 要提取字符5和6，您应该：

SUBSTR(:rId, 5, 2)

See the documentation . 请参阅文档。