mysql - 在 HQL 中减去子选择值

Question

我正在使用 Hibernate，我想从两个不同的子查询中获取的两个值中减去，但我收到以下错误:

SQLGramarEception: could not execute query

SELECT termQuery.term.id,
   (SELECT COALESCE(MIN(termResult2.position),101) FROM termQuery2.results termResult2 WHERE termResult2.url.hostname MEMBER subscription.account.domains) as **prevPosition**, 
   (SELECT COALESCE(MIN(termResult.position),101) FROM termQuery.results termResult WHERE termResult.url.hostname MEMBER subscription.account.domains) as **currentPosition**,
   prevPosition - currentPosition as change --<<<<<<
FROM TermSubscription subscription, TermQuery termQuery, TermQuery termQuery2
WHERE subscription.account.id=1197 
    AND termQuery.term=subscription.term 
    AND termQuery.provider.id=2
    AND termQuery.queryDate.yearWeek = '201242'
    AND termQuery2.term=termQuery.term
    AND termQuery2.provider.id=termQuery.provider.id
    AND termQuery2.queryDate.yearWeek = '201241'
ORDER BY subscription.term.id, termQuery.queryDate.yearWeek

我知道不可能像那样减去这两个值，但我不知道如何做。那么，会有什么办法呢？谢谢

Answer 1

仅选择其他 3 个值，并在迭代查询结果时，用 Java 从 prevPosition 中减去 currentPosition。