组CONCAT

Question

表1：PROJECT_BASIC_INFORMATION：

PROJECT_BASIC_INFORMATION_ID | TITLE 
PBID_1       TITLE_1 
PBID_2       TITLE_2 
PBID_3       TITLE_3 

表2：MAP_ASSOCIATED_PROJECTS

MAP_ID | PROJECT_BASIC_INFORMATION_ID | ASSOCIATED_PROJECT_BASIC_INFORMATION_ID 
    1   PBID_1       PBID_2 
    2   PBID_1       PBID_3 

我想有像在表1单project_basic_information_id查询，给我所有关联的project_basic_information_id（s）和相应的标题都以逗号分隔。

例如：在表1 PBID_1我应该得到的输出喜欢

Project_basic_information_ids | Project_titles 
pbid2,pbid3      title2,title3 

我尝试这个查询

SELECT GROUP_CONCAT(DISTINCT a.`ASSOCIATED_PROJECT_BASIC_INFORMATION_ID`) AS PROJECT_BASIC_INFORMATION_IDS,GROUP_CONCAT(DISTINCT b.`TITLE`) AS TITLE 
FROM MAP_ASSOCIATED_PROJECTS a LEFT OUTER JOIN 
`PROJECT_BASIC_INFORMATION` b ON b.PROJECT_BASIC_INFORMATION_ID =a.PROJECT_BASIC_INFORMATION_ID 

Answer 1

试试这个：

SELECT GROUP_CONCAT(DISTINCT a.ASSOCIATED_PROJECT_BASIC_INFORMATION_ID) AS Project_basic_information_ids , 
     GROUP_CONCAT(DISTINCT b.TITLE) AS Project_titles 
FROM MAP_ASSOCIATED_PROJECTS a 
LEFT OUTER JOIN PROJECT_BASIC_INFORMATION b ON a.ASSOCIATED_PROJECT_BASIC_INFORMATION_ID = b.PROJECT_BASIC_INFORMATION_ID 
WHERE a.PROJECT_BASIC_INFORMATION_ID = 'PBID_1' 
GROUP BY a.PROJECT_BASIC_INFORMATION_ID