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Re: Best practices to compute a rate from absolute data [message #651608 is a reply to message #651582] |
Mon, 31 January 2011 21:10 |
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Most built-in database operators work on the current row only. The usage you're describing is going to be cumbersome regardless of your choice of database and reporting system.
That said, you want to compute your numbers before you hand off to the chart engine. The approach you describe looks like it will work (I do very little charting, so cannot speak to issues coming from that aspect). Depending on how many columns you are working with and the size of the back-end dataset, you may have better performance using a self-join in order to compute the ratios from the database server rather than inside the BIRT application.
Good luck.
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