换成KINGBASE8关键字需要改变吗

是的，将代码转换为KINGBASE8关键字需要进行一些微调。以下是递归查询部门的子级部门的KINGBASE8代码示例：

WITH RECURSIVE DepartmentHierarchy(DepartmentID, DepartmentName, ParentDepartmentID) AS (
  SELECT DepartmentID, DepartmentName, ParentDepartmentID
  FROM Departments
  WHERE DepartmentID = :DepartmentID -- :DepartmentID是传入的参数，表示要查询的部门的ID
  UNION ALL
  SELECT d.DepartmentID, d.DepartmentName, d.ParentDepartmentID
  FROM Departments d
  INNER JOIN DepartmentHierarchy dh ON d.ParentDepartmentID = dh.DepartmentID
)
SELECT DepartmentID, DepartmentName, ParentDepartmentID
FROM DepartmentHierarchy;

需要注意的是，KINGBASE8的递归CTE语法与MySQL类似，需要使用WITH RECURSIVE关键字，并且参数占位符为冒号(:)而非@或$。由于KINGBASE8不支持递归CTE中的WHERE子句，所以我们将WHERE子句转换为了递归CTE的第一条查询中的过滤条件。