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Tempo's report is prettier and more powerful, allowing hours to grouped by any field (e.g. project, or tempo Account), even hierarchically. Tempo's one deficiency here, which motivated this reimplementation, is that it cannot show users which have not logged any work. Tempo's also honors Tempo's evil 'View All Worklogs' permission, which I consider an anti-feature.
But for the purposes of this tutorial, worklog information is just a nice example of something in the Jira database which you'd like to query in an interactive manner.
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