SQL查询/根据数据和ID计算值的排名

Question

对于每天和id，我们必须按降序对值进行排名。

下面是输入表。

>input data
+------------+----+-------+
|    date    | id | value |
+------------+----+-------+
| 01-01-2018 | A  |    20 |
| 01-01-2018 | A  |    50 |
| 01-01-2018 | C  |    40 |
| 01-01-2018 | B  |    40 |
| 02-01-2018 | A  |    30 |
| 03-01-2018 | C  |    20 |
| 03-01-2018 | C  |    40 |
| 04-01-2018 | B  |     0 |
| 04-01-2018 | B  |    40 |
| 05-01-2018 | B  |    70 |
+------------+----+-------+

输出应如下所示：

>output data
+------------+----+-------+------+
|    date    | id | value | rank |
+------------+----+-------+------+
| 01-01-2018 | A  |    50 |    1 |
| 01-01-2018 | A  |    20 |    2 |
| 01-01-2018 | B  |    40 |    1 |
| 01-01-2018 | C  |    40 |    1 |
| 02-01-2018 | A  |    30 |    1 |
| 03-01-2018 | C  |    40 |    1 |
| 03-01-2018 | C  |    20 |    2 |
| 04-01-2018 | B  |    40 |    1 |
| 04-01-2018 | B  |     0 |    2 |
| 05-01-2018 | B  |    70 |    1 |
+------------+----+-------+------+

Answer 1

您可以使用RANK()，在date和id上进行分区，并按value降序排列：