将SQL语句转换为JPQL语句

Question

我想知道如何将此SQL语句转换为JPQL：

SELECT sum(price) AS Income, count(*) AS Passages, Station.Name 
FROM Passage
INNER JOIN station ON passage.stationId = station.id
GROUP BY Station.Name

不会是这样的：

SELECT sum(price) AS Income, count(p) AS Passages, s.Name FROM Passage p
INNER JOIN station s     
ON p.stationId = s.id GROUP BY s.Name

？

Answer 1

问题解决了：

SELECT count(p), sum(p.price), s 
FROM Passage p 
INNER JOIN p.station s 
GROUP BY s.name;

Answer 2

JPQL （JPA 2.0）中没有ON ，但您可以执行隐式连接并使用WHERE子句：

假设实体Passage atriburo StationID是与实体Station的属性id相同的对象类型。

SELECT SUM(s.price) Income, COUNT(p) Passages, s.Name
FROM Passage p, Station s
WHERE p.stationId = s.id
GROUP BY s.Name

建议如果问题可以添加实体Station Passage并给出正确的答案。