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POProblems implementing SQL query in Rapidminer to create report
 

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    <p>My Questions: <li> Is there a way to add quotes around %{macro_name} in my SQL query ? <li> Is there a better way to create the required report (i.e. not using RapidMiner)?</p> <p>My Process:</p> <p>I'm currently trying to create a custom report of data stored in a MySQL database. Here is an hypothetical example of my table data:</p> <pre><code>Item_Name Item_Price Item_Stock Item_Timestamp Dish Soap 3.99 25 1/1/2013 12:00am Frogs 0.69 26 1/1/2013 12:00am Frogs 0.69 19 1/1/2013 1:00am Dish Soap 3.99 28 1/1/2013 1:00am </code></pre> <p>Item_Timestamp refers to the datetime of when the entry was made.</p> <p>I'm attempting to use RapidMiner to do the following: <li> Provide a summation of increases in Item_Stock for each unique Item_Name <li> Provide a summation of decreases in Item_Stock for each unique Item_Name <li> Provide the average rate of change over a specified time period</p> <p>My goal is to create a report that tells me whether items are being restocked at a rate of equilibrium with demand.</p> <p>In order to create a report for each unique Item_Name, I have created a RapidMiner process which loads unique Item_Name as an example set, then attempts to loop through the exampleset by using the extract macro operator which sends the Item_Name from each example to another SQL query. RapidMiner uses %{macro_name} as the syntax for the macro. My SQL query looks like:</p> <pre><code>Select Item_Name From thisTable Where Item_Name = %{macro_name} </code></pre> <p>The problem is that this query throws an exception, but I'm not sure why. Perhaps the problem is that %{macro_name} returns a string without the necessary quotes, but I am unsure.</p> <p>My questions are: <li> Is there a way to add quotes around %{macro_name} in my SQL query ? <li> Is there a better way to create the required report (i.e. not using RapidMiner)?</p>
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