row_number

row_number 窗口函数文档

对当前行在其分区内从 1 开始编号。

语法

row_number (column_name)
  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])

有关窗口函数语法的更多信息，请参见：窗口函数 - 语法。

返回值

• 当前行在其分区中的序号。UInt64。

示例

以下示例基于视频教程 ClickHouse 中的排名窗口函数 中提供的示例。

Query

CREATE TABLE salaries
(
    `team` String,
    `player` String,
    `salary` UInt32,
    `position` String
)
Engine = Memory;

INSERT INTO salaries FORMAT Values
    ('Port Elizabeth Barbarians', 'Gary Chen', 195000, 'F'),
    ('New Coreystad Archdukes', 'Charles Juarez', 190000, 'F'),
    ('Port Elizabeth Barbarians', 'Michael Stanley', 150000, 'D'),
    ('New Coreystad Archdukes', 'Scott Harrison', 150000, 'D'),
    ('Port Elizabeth Barbarians', 'Robert George', 195000, 'M');

Query

SELECT player, salary, 
       row_number() OVER (ORDER BY salary DESC) AS row_number
FROM salaries;

Response

   ┌─player──────────┬─salary─┬─row_number─┐
1. │ Gary Chen       │ 195000 │          1 │
2. │ Robert George   │ 195000 │          2 │
3. │ Charles Juarez  │ 190000 │          3 │
4. │ Scott Harrison  │ 150000 │          4 │
5. │ Michael Stanley │ 150000 │          5 │
   └─────────────────┴────────┴────────────┘