计算php和mysql中表的总条目数

时间:2014-03-29 15:25:16

标签: php mysql sql

这是一个完美的例子,但我必须在下面的示例中手动提及日期和状态,如何在数据库表中选择所有可用的日期和状态。

SELECT state,
       SUM( if( date='2013-10-01', 1, 0) ) `2013-10-01`,
       SUM( if( date='2013-10-02', 1, 0) ) `2013-10-02`, 
       SUM( if( date='2013-10-03', 1, 0) ) `2013-10-03`
       --  .........   
       --  .........  
       --  .........  
FROM `table`
GROUP BY state;

| STATE | 2013-10-01 | 2013-10-02 | 2013-10-03 |
|-------|------------|------------|------------|
|    CO |          4 |          2 |          3 |
|    NY |          3 |          1 |          0 |
|    TX |          1 |          0 |          4 |


SELECT `date`,
       SUM( CASE state WHEN 'NY' THEN 1 ELSE 0 END ) `NY`,
       SUM( CASE state WHEN 'CO' THEN 1 ELSE 0 END ) `CO`,
       SUM( CASE state WHEN 'TX' THEN 1 ELSE 0 END ) `TX`
       --  .........  
       --  .........  
       --  .........  
FROM `table`
GROUP BY `date`

|                           DATE | NY | CO | TX |
|--------------------------------|----|----|----|
| October, 01 2013 00:00:00+0000 |  3 |  4 |  1 |
| October, 02 2013 00:00:00+0000 |  1 |  2 |  0 |
| October, 03 2013 00:00:00+0000 |  0 |  3 |  4 |

0 个答案:

没有答案