left join 关联相同两张表，并将关联表的分别两条数据，整体合并为一条

SELECT
di.id,
di.description,
vi.extend_value videoUrl,
ti.extend_value title,
di.create_date

FROM designer_issue di

left join designer_issue_extends vi on di.id = vi.issue_id
left join designer_issue_extends ti on di.id = ti.issue_id

where di.issue_type = 1 and vi.extend_key = 'video_url' and ti.extend_key = 'video_title'

limit 1