Copy and Edit Dataset

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1

I have a dataset, TempSP, for a chart that is bound to SQL. Its columns are “StepNumber”, “Temperature”.

I need to bind a second dataset, TempSP_LL, that is “StepNumber”, (“Temperature” - 20).

The code below is the expression I have tried to use in the binding for TempSP_LL.

{Root Container.Root Container.R1P1.Chart.TempSP}["StepNumber",("Temperature"-20)]

It gives an error (Expected ‘Number’, found ‘String’).

Thank you for your help.

2

Hello,

I understand what you’re trying to do, but the Expression language doesn’t do that. Instead, you need to bind the second dataset to another SQL query like SELECT StepNumber, Temperature-20 AS NewTemp FROM MyTable

Hope this helps,

3

Ok. I was trying to limit the number of SQL queries. I will have many graphs that will include “+20” and “-20” lines.

Thanks.

4

Yeah, limiting the number of queries is always a good idea. Why don’t you simply run the query like this:

SELECT StepNumber, Temperature, Temperature + 20 AS HighLine, Temperature - 20 AS LowLine FROM MyTable

You don’t need a query per line for the chart component. Or, even better, use the Easy Chart - it’ll group queries together like that for you when it can.

Hope this helps,