用hql实现SELECT * from expense_main a LEFT JOIN org_person b on a.Fd_expense_id =b.Fd_id where b.Fd_level =2 and a.Fd_create_date >= '2020-04-10' AND a.Fd_create_date <= '2020-05-10'ORDER BY a.Fd_amount DESC

我可以回答这个问题。使用HQL语句实现该查询可以如下：

SELECT a, b FROM ExpenseMain a LEFT JOIN a.orgPerson b WHERE b.level = 2 AND a.createDate BETWEEN '2020-04-10' AND '2020-05-10' ORDER BY a.amount DESC

相关问题

hql to_date

HQL (Hibernate Query Language) does not provide a built-in function called `to_date` like SQL does. However, you can still achieve the same functionality using other HQL functions and expressions.

If you want to convert a string to a date in HQL, you can use the `cast` function to explicitly cast the string to a date type. Here's an example:

String hqlQuery = "SELECT e FROM Employee e WHERE e.hireDate >= cast(:startDate as date)";
Query query = session.createQuery(hqlQuery);
query.setParameter("startDate", "2022-01-01");
List<Employee> result = query.getResultList();

In this example, we are casting the `startDate` parameter from a string to a date type using the `cast` function. Then, we can use this date value in the HQL query to filter employees based on their hire dates.

Keep in mind that the syntax and available functions may vary depending on the specific version of Hibernate you are using.

hql group by用法mySQL_HQL语言order by语句与group by子句使用实例

在MySQL中，GROUP BY子句用于将结果集按照一个或多个列进行分组，并对每个组进行汇总计算。ORDER BY子句用于对结果集进行排序。

下面是一个示例：

假设有一个名为"employees"的表，包含以下列：id、name、department、salary。我们想要按照部门对工资进行分组，并计算每个部门的平均工资和最高工资。我们还想按照平均工资进行降序排序。

可以使用以下语句：

SELECT department, AVG(salary) as average_salary, MAX(salary) as max_salary 
FROM employees 
GROUP BY department 
ORDER BY average_salary DESC;

这将返回按照部门分组的平均工资和最高工资，并按照平均工资进行降序排序的结果集。

注意，SELECT子句中的列必须是GROUP BY子句中列的子集或聚合函数。在本例中，department列是GROUP BY子句中的列，而salary列使用了AVG和MAX聚合函数。