HQL 意外标记“(”子查询 select

Question

我有这个问题。将它从我的 sql 查询翻译成 hql。我有这个错误 "unexpected token: ( near line 2, column"

String query = "SELECT MAX(number)\n" +
        "  FROM (SELECT number FROM EmployeeTripCard \n" +
        "        WHERE EXTRACT(YEAR FROM issueDate) = '2015'\n" +
        "        UNION ALL\n" +
        "        SELECT trip_card_number FROM PostgraduateTripCard\n" +
        "        WHERE EXTRACT(YEAR FROM issueDate) = '2015'\n" +
        "        UNION ALL\n" +
        "        SELECT trip_card_number FROM StudentTripCard \n" +
        "        WHERE EXTRACT(YEAR FROM issueDate) = '2015'\n" +
        "        )";




Integer result = (Integer) getSessionFactory().getCurrentSession().createQuery(query).uniqueResult();

我不明白哪里出了问题

Answer 1

我的坏 Votsalo，没看数据库标签。 from 子句不支持 HQL 子查询

请注意，HQL 子查询只能出现在 select 或 where 子句中：Hibernate Query Language

HQL 意外标记“(”子查询 select

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syntax-error