Question

我有两张桌子

表oc_1234567890

| time                |  S363  |  S342  |  
| 2015-04-20 22:39:17 | 19.12  | 19.43  |   
| 2015-04-20 22:36:49 | 19.12  | 19.43  |  
| 2015-04-20 22:34:20 | 19.12  | 19.43  |  
| 2015-04-20 22:31:52 | 19.12  | 19.43  |   
| 2015-04-20 22:29:23 | 19.18  | 19.43  |

表oc_1122334455

| time                |  S352  |   
| 2015-04-20 22:38:03 | 15.68  |   
| 2015-04-20 22:35:34 | 15.68  |   
| 2015-04-20 22:33:06 | 15.68  |   
| 2015-04-20 22:30:38 | 15.68  |   
| 2015-04-20 22:28:09 | 15.68  |

需要将它按时间合并到1,2或5分钟并从1440年获取200条记录期待这样的数组：

$array = [                
     "2015-04-20 22:38" => {
    "S352" => "15.68",  "S363" => "19.12",  "S342" => "19.43",     }            
     "2015-04-20 22:35" => {
    "S352" => "15.68",  "S363" => "19.12",  "S342" => "19.43",     }            
     "2015-04-20 22:33" => {
    "S352" => "15.68",  "S363" => "19.12",  "S342" => "19.43",     }            
     "2015-04-20 22:30" => {
    "S352" => "15.68",  "S363" => "19.12",  "S342" => "19.43",     }            
     "2015-04-20 22:28" => {
    "S352" => "15.68",  "S363" => "19.18",  "S342" => "19.43",     }  
];

请帮忙提出建议！

Answer 1

这个怎么样？

SELECT LEFT（时间，16）分钟，S352，S342，S363 FROM oc_1234567890 a JOIN oc_1122334455 b ON LEFT（a.time，16）= LEFT（b.time，16）

对于大型数据集，这将非常慢。我可能会创建一个中间映射表，将time映射到您想要的1,2或5分钟内部。

MySQL多表选择查询组

1 个答案: