row_number

为当前行在其分区内编号，从1开始。

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详细信息，请参见：窗口函数 - 语法。

返回值

• 当前行在其分区内的编号。UInt64。

示例

以下示例基于视频教程中提供的示例：ClickHouse中的排名窗口函数。

查询：

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');

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

结果：

   ┌─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 │
   └─────────────────┴────────┴────────────┘