Charindex and Substring

Question

Dear all,

Declare @key varchar(100)
Set @key = 'Total Price including Commission at This Level: '

Select
SUBSTRING(calculation,start,finish-start)
From
(
Select 
calculation,
start = charindex(@key,calculation,1)+LEN(@key)+1,
finish = charindex(' ',calculation,charindex(@key,calculation,1)+LEN(@key)+1)
From pr_cal 
) A

Result:
It returns few rows for eg:
-3.6847058823529411764705882353
-7.4565766786786564342346795345
-3.6842684690456865422468005352

and then i got "Invalid length parameter passed to the LEFT or SUBSTRING function" error

Please any one can let me know, How to amend this Query to avoid the above error and i need only value for ex -3.684.Thanks.

Regards, SG

Answer 1

SUBSTRING need to have usable values

start_expression
Is an integer or bigint expression that specifies where the returned characters start. If start_expression is less than 1, the returned expression will begin at the first character that is specified in value_expression. In this case, the number of characters that are returned is the largest value of either the sum of start_expression and length_expression or 0. If start_expression is greater than the number of characters in the value expression, a zero-length expression is returned.
length_expression
Is a positive integer or bigint expression that specifies how many characters of the value_expression will be returned. If length_expression is negative, an error is generated and the statement is terminated. If the sum of start_expression and length_expression is greater than the number of characters in value_expression, the whole value expression beginning at start_expression is returned.

If your values "start" and "finish-start" dont comply with these rules then you will get that error

Charindex and Substring

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