💬Generate LLM translations (#968)

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Co-authored-by: Quan <[email protected]>

Author: github-actions[bot]

docs/cn/sql-reference/20-sql-functions/08-window-functions/first-value.md

@@ -1,55 +1,92 @@
 ---
-title: FIRST_VALUE
----
-
-import FunctionDescription from '@site/src/components/FunctionDescription';
-
-<FunctionDescription description="Introduced: v1.1.50"/>
-
-Returns the first value from an ordered group of values.
-
-See also:
-
-- [LAST_VALUE](last-value.md)
-- [NTH_VALUE](nth-value.md)
-
-## Syntax
-
-```sql
-FIRST_VALUE(expression) OVER ([PARTITION BY partition_expression] ORDER BY order_expression [window_frame])
-```
-
-For the syntax of window frame, see [Window Frame Syntax](index.md#window-frame-syntax).
-
-## Examples
-
-```sql
-CREATE TABLE employees (
-  employee_id INT,
-  first_name VARCHAR(50),
-  last_name VARCHAR(50),
-  salary DECIMAL(10,2)
-);
-
-INSERT INTO employees (employee_id, first_name, last_name, salary)
-VALUES
-  (1, 'John', 'Doe', 5000.00),
-  (2, 'Jane', 'Smith', 6000.00),
-  (3, 'David', 'Johnson', 5500.00),
-  (4, 'Mary', 'Williams', 7000.00),
-  (5, 'Michael', 'Brown', 4500.00);
-
--- Use FIRST_VALUE to retrieve the first name of the employee with the highest salary
-SELECT employee_id, first_name, last_name, salary,
-       FIRST_VALUE(first_name) OVER (ORDER BY salary DESC) AS highest_salary_first_name
-FROM employees;
-
-
-employee_id | first_name | last_name | salary  | highest_salary_first_name
-------------+------------+-----------+---------+--------------------------
-4           | Mary       | Williams  | 7000.00 | Mary
-2           | Jane       | Smith     | 6000.00 | Mary
-3           | David      | Johnson   | 5500.00 | Mary
-1           | John       | Doe       | 5000.00 | Mary
-5           | Michael    | Brown     | 4500.00 | Mary
+title: FIRST_VALUE
+---
+
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="引入版本: v1.2.568"/>
+
+当使用 `IGNORE NULLS` 时，FIRST_VALUE 函数返回窗口框架中第一个非 NULL 的值（如果所有值均为 NULL，则返回 NULL）。如果未指定，默认行为是 `RESPECT NULLS`。
+
+另请参阅：
+
+- [LAST_VALUE](last-value.md)
+- [NTH_VALUE](nth-value.md)
+
+## 语法
+
+```sql
+FIRST_VALUE(expression) [ { IGNORE | RESPECT } NULLS ] OVER ([PARTITION BY partition_expression] ORDER BY order_expression [window_frame])
+```
+
+有关窗口框架的语法，请参阅 [窗口框架语法](index.md#window-frame-syntax)。
+
+## 示例
+
+```sql
+CREATE TABLE employees (
+  employee_id INT,
+  first_name VARCHAR(50),
+  last_name VARCHAR(50),
+  salary DECIMAL(10,2)
+);
+
+INSERT INTO employees (employee_id, first_name, last_name, salary)
+VALUES
+  (1, 'John', 'Doe', 5000.00),
+  (2, 'Jane', 'Smith', 6000.00),
+  (3, 'David', 'Johnson', 5500.00),
+  (4, 'Mary', 'Williams', 7000.00),
+  (5, 'Michael', 'Brown', 4500.00);
+
+-- 使用 FIRST_VALUE 获取薪水最高的员工的姓名
+SELECT employee_id, first_name, last_name, salary,
+       FIRST_VALUE(first_name) OVER (ORDER BY salary DESC) AS highest_salary_first_name
+FROM employees;
+
+
+employee_id | first_name | last_name | salary  | highest_salary_first_name
+------------+------------+-----------+---------+--------------------------
+4           | Mary       | Williams  | 7000.00 | Mary
+2           | Jane       | Smith     | 6000.00 | Mary
+3           | David      | Johnson   | 5500.00 | Mary
+1           | John       | Doe       | 5000.00 | Mary
+5           | Michael    | Brown     | 4500.00 | Mary
+
+```
+
+### 使用 IGNORE NULLS 返回非 NULL 值
+
+```sql
+CREATE or replace TABLE example AS SELECT * FROM (VALUES
+	(0, 1, 614),
+	(1, 1, null),
+	(2, 1, null),
+	(3, 1, 639),
+	(4, 1, 2027)
+) tbl(id, user_id, order_id);
+
+
+SELECT
+  id,
+  user_id,
+  order_id,
+  FIRST_VALUE (order_id) IGNORE nulls over (
+    PARTITION BY user_id
+    ORDER BY
+      id ROWS BETWEEN 1 PRECEDING AND UNBOUNDED FOLLOWING
+  ) AS last_order_id
+FROM
+  example
+
+┌───────────────────────────────────────────────────────┐
+│   id  │ user_id │     order_id     │   last_order_id  │
+├───────┼─────────┼──────────────────┼──────────────────┤
+│     0 │       1 │              614 │              614 │
+│     1 │       1 │             NULL │              614 │
+│     2 │       1 │             NULL │              639 │
+│     3 │       1 │              639 │              639 │
+│     4 │       1 │             2027 │              639 │
+└───────────────────────────────────────────────────────┘
+
 ```

docs/cn/sql-reference/20-sql-functions/08-window-functions/last-value.md

@@ -1,54 +1,90 @@
 ---
-title: LAST_VALUE
----
-
-import FunctionDescription from '@site/src/components/FunctionDescription';
-
-<FunctionDescription description="Introduced: v1.1.50"/>
-
-Returns the last value from an ordered group of values.
-
-See also:
-
-- [FIRST_VALUE](first-value.md)
-- [NTH_VALUE](nth-value.md)
-
-## Syntax
-
-```sql
-LAST_VALUE(expression) OVER ([PARTITION BY partition_expression] ORDER BY order_expression [window_frame])
-```
-
-For the syntax of window frame, see [Window Frame Syntax](index.md#window-frame-syntax).
-
-## Examples
-
-```sql
-CREATE TABLE employees (
-  employee_id INT,
-  first_name VARCHAR(50),
-  last_name VARCHAR(50),
-  salary DECIMAL(10,2)
-);
-
-INSERT INTO employees (employee_id, first_name, last_name, salary)
-VALUES
-  (1, 'John', 'Doe', 5000.00),
-  (2, 'Jane', 'Smith', 6000.00),
-  (3, 'David', 'Johnson', 5500.00),
-  (4, 'Mary', 'Williams', 7000.00),
-  (5, 'Michael', 'Brown', 4500.00);
-
--- Use LAST_VALUE to retrieve the first name of the employee with the lowest salary
-SELECT employee_id, first_name, last_name, salary,
-       LAST_VALUE(first_name) OVER (ORDER BY salary DESC) AS lowest_salary_first_name
-FROM employees;
-
-employee_id | first_name | last_name | salary  | lowest_salary_first_name
-------------+------------+-----------+---------+------------------------
-4           | Mary       | Williams  | 7000.00 | Michael
-2           | Jane       | Smith     | 6000.00 | Michael
-3           | David      | Johnson   | 5500.00 | Michael
-1           | John       | Doe       | 5000.00 | Michael
-5           | Michael    | Brown     | 4500.00 | Michael
+title: LAST_VALUE
+---
+
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="引入版本: v1.2.568"/>
+
+当使用 `IGNORE NULLS` 时，LAST_VALUE 函数返回窗口框架中最后一个非 NULL 值（如果所有值均为 NULL，则返回 NULL）。如果未指定，默认值为 RESPECT NULLS。
+
+另请参阅：
+
+- [FIRST_VALUE](first-value.md)
+- [NTH_VALUE](nth-value.md)
+
+## 语法
+
+```sql
+LAST_VALUE(expression) [ { IGNORE | RESPECT } NULLS ] OVER ([PARTITION BY partition_expression] ORDER BY order_expression [window_frame])
+```
+
+有关窗口框架的语法，请参阅 [窗口框架语法](index.md#window-frame-syntax)。
+
+## 示例
+
+```sql
+CREATE TABLE employees (
+  employee_id INT,
+  first_name VARCHAR(50),
+  last_name VARCHAR(50),
+  salary DECIMAL(10,2)
+);
+
+INSERT INTO employees (employee_id, first_name, last_name, salary)
+VALUES
+  (1, 'John', 'Doe', 5000.00),
+  (2, 'Jane', 'Smith', 6000.00),
+  (3, 'David', 'Johnson', 5500.00),
+  (4, 'Mary', 'Williams', 7000.00),
+  (5, 'Michael', 'Brown', 4500.00);
+
+-- 使用 LAST_VALUE 检索薪水最低的员工的 first_name
+SELECT employee_id, first_name, last_name, salary,
+       LAST_VALUE(first_name) OVER (ORDER BY salary DESC) AS lowest_salary_first_name
+FROM employees;
+
+employee_id | first_name | last_name | salary  | lowest_salary_first_name
+------------+------------+-----------+---------+------------------------
+4           | Mary       | Williams  | 7000.00 | Michael
+2           | Jane       | Smith     | 6000.00 | Michael
+3           | David      | Johnson   | 5500.00 | Michael
+1           | John       | Doe       | 5000.00 | Michael
+5           | Michael    | Brown     | 4500.00 | Michael
+```
+
+### 使用 IGNORE NULLS 返回非 NULL 值
+
+```sql
+CREATE or replace TABLE example AS SELECT * FROM (VALUES
+	(0, 1, 614),
+	(1, 1, null),
+	(2, 1, null),
+	(3, 1, 639),
+	(4, 1, 2027)
+) tbl(id, user_id, order_id);
+
+
+SELECT
+  id,
+  user_id,
+  order_id,
+  LAST_VALUE (order_id) IGNORE NULLS over (
+    PARTITION BY user_id
+    ORDER BY
+      id ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING
+  ) AS last_order_id
+FROM
+  example
+
+┌───────────────────────────────────────────────────────┐
+│   id  │ user_id │     order_id     │   last_order_id  │
+├───────┼─────────┼──────────────────┼──────────────────┤
+│     0 │       1 │              614 │             NULL │
+│     1 │       1 │             NULL │              614 │
+│     2 │       1 │             NULL │              614 │
+│     3 │       1 │              639 │              614 │
+│     4 │       1 │             2027 │              639 │
+└───────────────────────────────────────────────────────┘
+
 ```