需要幫助使用php mysql生成報告

Question

我想加入processID上的兩個MySQL表，並獲得如下報告。

table 1: LMProcess 
------------------------------------ 
| ProcessID | LMNo | Status | Dept | 
------------------------------------ 
|1   |1001 |1  |Legal | 
|2   |1001 |1  |R&D | 
|3   |1001 |1  |D&R | 
|4   |1001 |1  |L&M | 
|5   |1002 |1  |Legal | 
|6   |1002 |1  |R&D | 
|7   |1002 |1  |D&R | 
|8   |1002 |1  |L&M | 
------------------------------------ 

table 2: Recommendation 
----------------------------------- 
| ID | ProcessID | Recommendation | 
----------------------------------- 
| |1   |Yes    | 
| |2   |No    | 
| |3   |Yes    | 
| |4   |Yes    | 
| |5   |Yes    | 
| |6   |No    | 
| |7   |No    | 
| |8   |Yes    | 
----------------------------------- 

Report: LM File Recommendations by the Departments 
---------------------------------- 
| LMNo | Legal | R&D | D&R | L&M | 
---------------------------------- 
|1001 |Yes |No |Yes |Yes | 
|1002 |Yes |No |No |Yes | 
---------------------------------- 

Answer 1

您正在嘗試進行旋轉操作，這是一些其他的RDBMS原生支持，但是MySQL不（爲開發商覺得這是一件真正屬於在表示層，而不是數據庫的東西）。

但是，您可以將您的結果通過LMNo和使用MySQL的GROUP_CONCAT()功能來達到預期的效果：

SELECT LMNo 
     , GROUP_CONCAT(IF(Dept='Legal', Recommendation, NULL)) AS `Legal` 
     , GROUP_CONCAT(IF(Dept='R&D' , Recommendation, NULL)) AS `R&D` 
     , GROUP_CONCAT(IF(Dept='D&R' , Recommendation, NULL)) AS `D&R` 
     , GROUP_CONCAT(IF(Dept='L&M' , Recommendation, NULL)) AS `L&M` 
FROM  LMProcess JOIN Recommendation USING (ProcessID) 
GROUP BY LMNo