ROW_NUMBER OVER 函数
语法
ROW_NUMBER( ) OVER([PARTITION BY col_name1,col_name2,…] ORDER
BY
col_name1 [asc/desc], col_name2 [asc/desc],…)
功能描述
同rank 的区别就是相同的排序值序号也会依次递增。
例如，两行排序值相同，则序数为1，2。
使用说明和使用约束同RANK() OVER() 。
示例
示例1：ROW_NUMBER() OVER(PARTITION BY i order by j desc)
gbase> DROP TABLE IF EXISTS t1;
Query OK, 0 rows affected
gbase> CREATE TABLE t1(i int, j int);
Query OK, 0 rows affected
gbase> INSERT INTO t1 VALUES(2,1),(2,3),(2,3),(2,5),(3,2),(3,2),(3,2),(3,4),
(3,1),(3,5);
Query OK, 10 rows affected
Records: 10
Duplicates: 0
Warnings: 0
gbase> SELECT *,RANK() OVER(PARTITION BY i order by j desc) A
GBase 8a MPP Cluster 产品手册
5 数据库管理指南
文档版本953（2022-04-10）
南大通用数据技术股份有限公司
894
S rank,DENSE_RANK() OVER(PARTITION BY i order by j desc) AS d
ense_rank ,ROW_NUMBER() OVER(PARTITION BY i order by j desc)
AS row_number FROM t1;
+------+------+------+------------+------------+
| i
| j
| rank | dense_rank | row_number |
+------+------+------+------------+------------+
|
2 |
5 |
1 |
1 |
1 |
|
2 |
3 |
2 |
2 |
2 |
|
2 |
3 |
2 |
2 |
3 |
|
2 |
1 |
4 |
3 |
4 |
|
3 |
5 |
1 |
1 |
1 |
|
3 |
4 |
2 |
2 |
2 |
|
3 |
2 |
3 |
3 |
3 |
|
3 |
2 |
3 |
3 |
4 |
|
3 |
2 |
3 |
3 |
5 |
|
3 |
1 |
6 |
4 |
6 |
+------+------+------+------------+------------+
10 rows in set