SQL Group by With Case

Question

Name |  Amount | Date
_____________________
Jacob | 15 |    1-Oct-16

Jacob | 50 |    2-Oct-16

Ethan | 24 |    3-Oct-16

Jacob | 30 |    3-Oct-16

William |   17 |    1-Oct-16

William |   11 |    2-Oct-16

Ethan | 36 |    3-Oct-16

Ethan | 9 | 1-Oct-16

我有上面的表格，我想要最近5天的金额总和

Name | 5-oct-16 | 4-oct-16 | 3-oct-16 | 2-oct-16| 1-oct-16 
___________________________________________________________

Jacob | 0       | 0        |30         | 50        | 15
Ethan | 0       | 0        |60         | 0        | 9
William | 0       | 0        |0         | 11        | 17

希望按名称分组，并将最后5天的金额总和分开。

Answer 1

我认为你想要条件聚合：

SELECT Name,
       SUM(CASE DATE WHEN '2016-10-05' THEN Amount ELSE 0 END) as amount_2016105,
       SUM(CASE DATE WHEN '2016-10-04' THEN Amount ELSE 0 END) as amount_2016104,
       SUM(CASE DATE WHEN '2016-10-03' THEN Amount ELSE 0 END) as  amount_2016103,
       SUM(CASE DATE WHEN '2016-10-02' THEN Amount ELSE 0 END) as  amount_2016102,
       SUM(CASE DATE WHEN '2016-10-01' THEN Amount ELSE 0 END) as  amount_2016101
FROM MyTable
GROUP BY Name;