> ## Documentation Index
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> Use this file to discover all available pages before exploring further.

> last_value 窗口函数文档

# last_value

返回其有序窗口帧内计算得到的最后一个值。默认情况下会跳过 NULL 参数，但可以使用 `RESPECT NULLS` 修饰符来覆盖此行为。

**语法**

```sql theme={null}
last_value (column_name) [[RESPECT NULLS] | [IGNORE NULLS]]
  OVER ([[PARTITION BY grouping_column] [ORDER BY sorting_column] 
        [ROWS or RANGE expression_to_bound_rows_withing_the_group]] | [window_name])
FROM table_name
WINDOW window_name as ([[PARTITION BY grouping_column] [ORDER BY sorting_column])
```

别名：`anyLast`。

<Note>
  在 `first_value(column_name)` 后使用可选修饰符 `RESPECT NULLS` 可确保不会跳过 `NULL` 参数。
  更多信息请参见 [NULL 处理](/zh/reference/functions/aggregate-functions#null-processing)。

  别名：`lastValueRespectNulls`
</Note>

有关窗口函数语法的更多信息，请参见：[Window Functions - Syntax](/zh/reference/functions/window-functions#syntax)。

**返回值**

* 在其有序窗口帧内计算得到的最后一个值。

**示例**

在本示例中，`last_value` 函数用于从一个虚构的英超足球运动员薪资数据集中找出薪资最低的球员。

```sql title="Query" theme={null}
DROP TABLE IF EXISTS salaries;
CREATE TABLE salaries
(
    `team` String,
    `player` String,
    `salary` UInt32,
    `position` String
)
Engine = Memory;

INSERT INTO salaries FORMAT VALUES
    ('Port Elizabeth Barbarians', 'Gary Chen', 196000, 'F'),
    ('New Coreystad Archdukes', 'Charles Juarez', 190000, 'F'),
    ('Port Elizabeth Barbarians', 'Michael Stanley', 100000, 'D'),
    ('New Coreystad Archdukes', 'Scott Harrison', 180000, 'D'),
    ('Port Elizabeth Barbarians', 'Robert George', 195000, 'M'),
    ('South Hampton Seagulls', 'Douglas Benson', 150000, 'M'),
    ('South Hampton Seagulls', 'James Henderson', 140000, 'M');
```

```sql title="Query" theme={null}
SELECT player, salary,
       last_value(player) OVER (ORDER BY salary DESC RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS lowest_paid_player
FROM salaries;
```

```response title="Response" theme={null}
   ┌─player──────────┬─salary─┬─lowest_paid_player─┐
1. │ Gary Chen       │ 196000 │ Michael Stanley    │
2. │ Robert George   │ 195000 │ Michael Stanley    │
3. │ Charles Juarez  │ 190000 │ Michael Stanley    │
4. │ Scott Harrison  │ 180000 │ Michael Stanley    │
5. │ Douglas Benson  │ 150000 │ Michael Stanley    │
6. │ James Henderson │ 140000 │ Michael Stanley    │
7. │ Michael Stanley │ 100000 │ Michael Stanley    │
   └─────────────────┴────────┴────────────────────┘
```