ROW_NUMBER

说明

按照order_by_clause排序的已排序行组，从1开始为每一行分配一个唯一的数字。

语法

row_number ::=

参数

query_partition_clause

一个分区语句。

order_by_clause

一个排序语句。

返回值

行的编号。

示例

示例1: 为记录编号

--  清理环境
DROP TABLE tab1 CASCADE;

--  创建表并插入数据
create table tab1(id INT, a INT, b INT);

INSERT INTO tab1 VALUES(1, 21, 55);
INSERT INTO tab1 VALUES(2, 21, 56);
INSERT INTO tab1 VALUES(3, 21, 48);
INSERT INTO tab1 VALUES(4, 22, 70);
INSERT INTO tab1 VALUES(5, 22, 65);
INSERT INTO tab1 VALUES(6, 11, 40);
INSERT INTO tab1 VALUES(7, 11, 43);
INSERT INTO tab1 VALUES(8, 31, 77);
INSERT INTO tab1 VALUES(9, 32, 80);


SELECT * FROM tab1 ORDER BY id;
ID(int)      |A(int)      |B(int)      |
-------------------------------------
1            |21          |55          |
-------------------------------------
2            |21          |56          |
-------------------------------------
3            |21          |48          |
-------------------------------------
4            |22          |70          |
-------------------------------------
5            |22          |65          |
-------------------------------------
6            |11          |40          |
-------------------------------------
7            |11          |43          |
-------------------------------------
8            |31          |77          |
-------------------------------------
9            |32          |80          |
总数目：9


--  为记录编号
SELECT id, a, b, ROW_NUMBER() OVER (ORDER BY a) FROM tab1 ORDER BY id;
ID(int)      |A(int)      |B(int)      |ROW_NUMBER(bigint)      |
-------------------------------------------------------------
1            |21          |55          |4                       |
-------------------------------------------------------------
2            |21          |56          |5                       |
-------------------------------------------------------------
3            |21          |48          |3                       |
-------------------------------------------------------------
4            |22          |70          |6                       |
-------------------------------------------------------------
5            |22          |65          |7                       |
-------------------------------------------------------------
6            |11          |40          |1                       |
-------------------------------------------------------------
7            |11          |43          |2                       |
-------------------------------------------------------------
8            |31          |77          |8                       |
-------------------------------------------------------------
9            |32          |80          |9                       |
总数目：9

--  删除表
DROP TABLE tab1;