Here is your query that prints issue id, issue number, project key and project name (please note that visible issue key that we see is combination of project key and issue number, i.e. <PROJECT_KEY>-<ISSUE_NUMBER>)
SELECT i.id AS 'Issue ID',
i.issuenum AS 'Issue Number',
p.pkey AS 'Project Key',
p.pname AS 'Project Name'
FROM jiraissue i
left join project p
ON i.project = p.id
WHERE i.created > Date_sub(Now(), interval 6 month);
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