[摘要]落日余晖很美，有飞鸟盘桓在电线之间，和幼时夏日傍晚的记忆重合。。下面是小编精心整理的递归查询英文及情话异地韩语翻译内容。情话异地韩语翻译1。我无法传达我自己...
关于递归查询英文（情话异地韩语翻译）的内容，下面是详细的介绍。
情话异地韩语翻译
递归查询英文
Recursive query in English refers to the process of querying data from a database or system using a recursive algorithm. This type of query is often used when dealing with hierarchical data structures, such as tree-like relationships between objects.
In SQL, recursive queries are typically implemented using the Common Table Expressions (CTEs) feature, which allows you to define a temporary result set that can be referenced within the same query. Here"s an example of a recursive query in SQL:
```sql
WITH RECURSIVE employee_hierarchy AS (
SELECT employee_id, manager_id, employee_name
FROM employees
WHERE manager_id IS NULL
UNION ALL
SELECT e.employee_id, e.manager_id, e.employee_name
FROM employees e
INNER JOIN employee_hierarchy eh ON e.manager_id = eh.employee_id
)
SELECT " FROM employee_hierarchy;
```
In this example, the `employee_hierarchy` CTE is defined first, with a base case that selects all top-level employees (those with no manager). The recursive case joins the `employees` table with the `employee_hierarchy` CTE on the `manager_id` column to include all employees who are managed by other employees.
The final `SELECT` statement retrieves all rows from the `employee_hierarchy` CTE, showing the entire hierarchy of employees.