是否可以将查询的输出转换为可能？

Question

我从这个查询的输出：

select Date,Status, count(distinct persons)from TableA where Date='2014-11-04' group by Status; 

+------------+------------------------+-------------------------------+ 
| Date  | Status     | count(distinct persons)  | 
+------------+------------------------+-------------------------------+ 
| 2014-11-04 | 0      |       45 | 
| 2014-11-04 | 1      |       93 | 
+------------+------------------------+-------------------------------+ 

我想要得到的是：

+------------+------------------------+-------------------------------+ 
| Date  | 0      |  1       | 
+------------+------------------------+-------------------------------+ 
| 2014-11-04 | 45      | 93       | 
+------------+------------------------+-------------------------------+ 

Answer 1

可以使用CASE把一个条件你COUNT函数中：

SELECT Date, 
     COUNT(DISTINCT CASE WHEN status = 0 THEN persons END) AS `0`, 
     COUNT(DISTINCT CASE WHEN status = 1 THEN persons END) AS `1` 
FROM TableA 
WHERE Date = '2014-11-04' 
GROUP BY Date; 

Answer 2

您可以使用以下代码 -

select Date, [0], [1] 
from 
(select Date,Status,persons 
from TableA 
where Date='2014-11-04') AS SourceTable 
PIVOT 
(
    COUNT(persons) 
    FOR Status IN ([0],[1]) 
) AS PivotTable;