• "d5" means "decimal 5", similar to scientific notation. It means "26 followed by 5 zeroes". That's a number.

    It's one of the main weaknesses of IsNumeric.

    Sometimes, you have to use something like this:

    declare @STR varchar(100);

    select @STR = '26d5';

    select

    case patindex('%[^0-9]%', @STR)

    when 0 then cast(@Str as Int)

    else null

    end;

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