问题
Let say we have this table:
CREATE TABLE `table1` (
`Name` CHAR(50) NOT NULL,
`Type` CHAR(50) NOT NULL,
`Value` DOUBLE NOT NULL
)
COLLATE='latin1_swedish_ci'
ENGINE=InnoDB;
---------------------------------
| Name | Type | Value |
---------------------------------
| Dep1 | Cash | 100 |
---------------------------------
| Dep1 | Card | 200 |
---------------------------------
| Dep2 | Cash | 300 |
---------------------------------
| Dep2 | Card | 400 |
---------------------------------
How to create a MySQL select query to transform rows in columns like this? I must mention that column 'Name' has dynamic values!
--------------------------------
| Name | Cash | Card |
--------------------------------
| Dep1 | 100 | 200 |
--------------------------------
| Dep2 | 300 | 400 |
--------------------------------
回答1:
select name,
sum(case when `type` = 'Cash' then `value` else 0 end) as Cash,
sum(case when `type` = 'Card' then `value` else 0 end) as Card
from your_table
group by name
来源：https://stackoverflow.com/questions/36515502/group-rows-into-columns-with-sum