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Home/ Questions/How can I handle -invalid length parameter passed to the left or substring function?
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Aaron Jacquot
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Aaron Jacquot
Asked: May 12, 20222022-05-12T11:50:22+00:00 2022-05-12T11:50:22+00:00In: Programs

How can I handle -invalid length parameter passed to the left or substring function?

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I am working on programs, but I found the following warning message:

Invalid length parameter passed to the LEFT or SUBSTRING function

Is there any way to stabilize the issue “invalid length parameter passed to the left or substring function”? I read a lot of topics about this, but all of them were trying to install anything. Is this the correct way, or any recommendation for me? Please find the beginning command below:

SUBSTRING(PostCode, 1 , CHARINDEX(' ', PostCode ) -1)
invalid length parameter
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    lyytutoria Expert
    2022-06-01T02:47:31+00:00Added an answer on June 1, 2022 at 2:47 am

    The cause: This error only occurs if PostCode is missing any spaces.

    Solution: This could be done by adding conditionality so that PostCode can still be retrieved if a space is not found.

    select SUBSTRING(PostCode, 1 , 
    case when CHARINDEX(' ', PostCode ) = 0 then LEN(PostCode) 
    else CHARINDEX(' ', PostCode) -1 end)
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  2. Emma Adam
    2022-05-25T19:48:18+00:00Added an answer on May 25, 2022 at 7:48 pm

    CHARINDEX will return 0, if there are no spaces in the string. If not, you can search for -1 substrings.

    To avoid this, you can add a trailing space to the string at the end to ensure that there is always at most one space.

    SELECT SUBSTRING(PostCode, 1 , CHARINDEX(' ', PostCode + ' ' ) -1)
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    • 2022-06-06T15:14:54+00:00Replied to answer on June 6, 2022 at 3:14 pm

      Excelente… Gracias por el aporte.

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