You shouldn't be looking at the database, it is not designed for reporting, and reading it is the worst possible way to report on anything on Jira.
There is no SQL to find the project creation date. Jira does not store it, so there's nothing to look for.
The audit log (which you can read over REST or in the UI) does record project creation with a date stamp, but records in there are only retained for a short time.
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