書き換え自己は、私は、この自己JPQLに参加変換する必要がありJPQL

Question

に参加：

SELECT s1.* 
FROM site AS s1 
JOIN (SELECT site_type, MAX(last_update_date) AS LastUpdate 
     FROM site 
     WHERE site.last_update_date > "2011-02-27 16:57:53" 
     GROUP BY site_type) AS s2 
ON s1.site_type = s2.site_type 
AND s1.last_update_date = s2.LastUpdate 
ORDER BY s1.last_update_date DESC 

編集：ソリューション：

SELECT s1 
FROM Site s1 
WHERE s1.lastUpdateDate = (SELECT MAX(s2.lastUpdateDate) 
          FROM Site s2 
          WHERE s1.siteType = s2.siteType) 
AND s1.lastUpdateDate > "2011-02-27 16:57:53" 
ORDER BY s1.lastUpdateDate DESC 

代わりの自己結合、私は余分な選択を使用しましたlastUpdateDateのステートメント

編集2：これは、NULL値も含むため、これはより良い解決策です。唯一の欠点は、TypedQueryを使用できないことです。

SELECT s.id, s.url, s.siteType, MAX(s.lastUpdateDate) as maxLastUpdateDate 
FROM Site s 
GROUP BY s.siteType 
HAVING (maxLastUpdateDate < "2011-02-27 16:57:53" OR maxLastUpdateDate IS NULL) 

Answer 1

SELECT s.id, s.url, s.siteType, MAX(s.lastUpdateDate) as maxLastUpdateDate 
FROM Site s 
GROUP BY s.siteType 
HAVING (maxLastUpdateDate < "2011-02-27 16:57:53" OR maxLastUpdateDate IS NULL)