联表查询两列一对多，整理成一行，多的那一列逗号隔开

Posted 2022-01-28 z_java_20150812

--SQL SERVER
--试图1
create view v_projectuser as
select t.F_ProjectId,t.F_UserId,u.F_ChineseName from T_ProjectUser t,T_User u where t.F_UserId = u.f_id and t.F_Enabled = '1';

--试图2（依赖试图1）
create view v_projectusername as
SELECT  a.F_ProjectId ,
        STUFF(( SELECT  ',' + F_ChineseName
                FROM    v_projectuser
                WHERE   F_ProjectId = a.F_ProjectId
                FOR
                XML PATH('')
                ), 1, 1, '') AS F_UserNames
FROM    v_projectuser a
GROUP BY a.F_ProjectId; 

--mysql
create view v_projectusername as
SELECT
    t.F_ProjectId,
    GROUP_CONCAT( u.F_ChineseName )  F_UserNames
FROM
    t_projectuser t,
    t_user u 
WHERE
    t.F_UserId = u.F_Id 
    AND t.F_Enabled = '1' 
GROUP BY
    t.F_ProjectId;

--ORACLE
create view v_projectusername as
SELECT
    t.F_ProjectId,
    wmsys.wm_concat ( u.F_ChineseName ) F_UserNames 
FROM
    t_projectuser t,
    t_user u 
WHERE
    t.F_UserId = u.F_Id 
    AND t.F_Enabled = '1' 
GROUP BY
    t.F_ProjectId