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 have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs