MySQL：日付で前の行と次の行を含むIDで行を選択

最初のアプローチ。この選択は3行を返します。選択した行と前の日付の行、および次の日付のアノード行：

SELECT * FROM ( 
 SELECT 
   'THIS' as update_time,
   update_id, 
   project_id, 
   content, 
   date
 FROM 
   `update`
 WHERE 
   update_id = 2 AND project_id = 2
 ORDER 
   BY date DESC
 LIMIT 1
) TT
UNION
SELECT * FROM ( 
 SELECT 
   'PREVIOUS'  as update_time,
   update_id, 
   project_id, 
   content, 
   date
 FROM 
   `update`
 WHERE 
   update_id <> 2 AND project_id = 2 and
   date <= (select date from `update` where update_id = 2)
 ORDER 
   BY date DESC
 LIMIT 1
) TP
UNION
SELECT * FROM ( 
 SELECT 
   'NEXT'  as update_time,
   update_id, 
   project_id, 
   content, 
   date
 FROM 
   `update`
 WHERE 
   update_id <> 2 AND project_id = 2 and
   date >= (select date from `update` where update_id = 2)
 ORDER 
   BY date ASC
 LIMIT 1
) TN