Don't, if you can avoid it.
A simple JIRA filter for something like "project = xxx" will find your issues. Then include the Epic Link in the issue navigator output, along with other fields.
Doing this via the database means reading at least 4 tables (and I think it might actually be 6). It's hard, slow and may change. There's far easier routes - use them.
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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