MYSQL查詢使用CONTAINS更新字段

Question

我想在mySQL中進行查詢，如果department_name包含在「departments_handling_the_process」中，需要使用process_table的「process_name」的連接內容更新department_table的「processes_handled」領域。

這是我的問題是什麼樣子：

department_table  

department_name | processes_handled 
Department 1 | Process A; Process B; Process D; 
Department 2 | Process A; Process C: Process E; Process G; 
Department 3 | Process C; Process D; Process F 




process_table 

process_name | departments_handling_the_process 
Process A | Department 1; Department 2 
Process B | Department 1 
Process C | Department 2; Department 3 
Process D | Department 1; Department 3 
Process E | Department 2 
Process F | Department 3 
Process G | Department 2 

我現在的更新語句如下：

UPDATE department_table,process_table 
SET processes_handled= (SELECT GROUP_CONCAT(`process_name SEPARATOR '; ') 
         FROM process_table 
         WHERE CONTAINS(process_table.departments_handling_the_process, department_table.department_name)) 

WHERE CONTAINS(process_table.departments_handling_the_process, department_table.department_name) 
; 

我希望你能幫助我解決我的發言。感謝和更多的權力！

Answer 1

假設基於此評論：

好吧，但你的問題是目前尚不清楚給我。期望的結果是什麼？在我看來，department_table中的process_handled列已經是理想的結果。或者現在是空的？

的樣本數據：

CREATE TABLE department 
    (`department_name` varchar(12), `processes_handled` varchar(43)) 
; 


INSERT INTO department 
    (`department_name`, `processes_handled`) 
VALUES 
    ('Department 1', ''), 
    ('Department 2', ''), 
    ('Department 3', '') 
; 


CREATE TABLE process 
    (`process_name` varchar(9), `departments_handling_the_process` varchar(26)) 
; 

INSERT INTO process 
    (`process_name`, `departments_handling_the_process`) 
VALUES 
    ('Process A', 'Department 1; Department 2'), 
    ('Process B', 'Department 1'), 
    ('Process C', 'Department 2; Department 3'), 
    ('Process D', 'Department 1; Department 3'), 
    ('Process E', 'Department 2'), 
    ('Process F', 'Department 3'), 
    ('Process G', 'Department 2') 
; 

解決方案/更新語句：

update 
department 
set processes_handled = (select group_concat(process_name separator '; ') 
         from process where find_in_set(department_name, replace(departments_handling_the_process, '; ', ',')) != 0); 

結果：

select * from department; 

| DEPARTMENT_NAME |       PROCESSES_HANDLED | 
|-----------------|--------------------------------------------| 
| Department 1 |   Process A; Process B; Process D | 
| Department 2 | Process A; Process C; Process E; Process G | 
| Department 3 |   Process C; Process D; Process F | 

說明：

MySQL中沒有contains函數。改爲使用find_in_set()。還請注意，您必須用,替換;，以便find_in_set()正常工作。你可能會碰到更多這樣的「陷阱」。有些你會注意到，有些你可能不會（一次）。下面是留下了replace()功能，當輸出：

| DEPARTMENT_NAME | PROCESSES_HANDLED | 
|-----------------|----------------------| 
| Department 1 |   Process B | 
| Department 2 | Process E; Process G | 
| Department 3 |   Process F | 

所以要重測試和調試準備。此外，在其他情況下，您可能會被迫編寫一個函數來分割逗號分隔列並將其分散到多行中。這裏有足夠的例子在這裏是唯一的選擇。再次（但這次是最後一次），這個數據庫設計會遇到很多麻煩。

• 閱讀更多關於使用here
• 看到它在sqlfiddle