MySQL的合并两个查询

Question

我有以下表设置：

分支表：

... 
manager_id 
sales_manager_id 
admin_manager_id 
... 

上述列包含用户表的外键。

使事情变得复杂我也有一个branches_extra表：

branches_extra：

id 
branch_id 
user_id 
position_id 

包含USER_ID，branch_id额外的，工作人员外键，将在树枝被显示在网站上联系页面。标志是用户有时会显示多次becuae他们可以有多个职位/角色，我目前有2个查询我用于返回分支表中指定的经理，然后branch_extra表中额外的工作人员：

SELECT CONCAT(xoops_users_extra.first_name, ' ', xoops_users_extra.last_name) AS full_name, , xoops_users_extra.profile_image_thumb, xoops_users.email, 
      CASE xoops_users_extra.main_userid 
       WHEN branches.manager_id THEN 'Manager' 
       WHEN branches.sales_manager_id THEN 'Sales Manager' 
       WHEN branches.admin_manager_id THEN 'Admin Manager' 
       WHEN branches.ops_manager_id THEN 'Ops Manager' 
       WHEN branches.export_manager_id THEN 'Export Manager' 
       WHEN branches.import_manager_id THEN 'Import Manager' 
      END AS position, 
      CASE xoops_users_extra.main_userid 
       WHEN branches.manager_id THEN 1 
       WHEN branches.sales_manager_id THEN 2 
       WHEN branches.admin_manager_id THEN 3 
       WHEN branches.ops_manager_id THEN 4 
       WHEN branches.export_manager_id THEN 5 
       WHEN branches.import_manager_id THEN 6 
      END AS sort_order 
     FROM (branches, xoops_users_extra, xoops_users) 
     WHERE ((branches.manager_id = xoops_users_extra.main_userid) 
      OR (branches.sales_manager_id = xoops_users_extra.main_userid) 
      OR (branches.admin_manager_id = xoops_users_extra.main_userid) 
      OR (branches.ops_manager_id = xoops_users_extra.main_userid) 
      OR (branches.export_manager_id = xoops_users_extra.main_userid) 
      OR (branches.import_manager_id = xoops_users_extra.main_userid)) 
      AND xoops_users.uid = xoops_users_extra.main_userid 
      AND branches.branch_id = %d ORDER BY sort_order ASC 

和额外的工作人员：

SELECT CONCAT(xoops_users_extra.first_name, ' ', xoops_users_extra.last_name) AS full_name, 
     positions.description AS position, xoops_users.email, xoops_users_extra.profile_image_thumb AS thumbnail 
    FROM (xoops_users, xoops_users_extra, branches_extra, branches, positions) 
    WHERE branches_extra.uid = xoops_users_extra.main_userid 
     AND positions.id = branches_extra.position 
     AND branches.branch_id = branches_extra.branch_id 
     AND xoops_users.uid = xoops_users_extra.main_userid 
     AND branches_extra.display =1 
     AND branches.branch_id = %d 

我想在一个单一的查询和CONCAT的“位置”一栏，而不是具有多个项目合并查询...

Answer 1

你什么可能要的是GROUP_CONCAT（）

SELECT userid, GROUP_CONCAT(position SEPARATOR ', ') 
FROM (
    ... position joining. 
) 
GROUP BY userid; 

并将该查询用作较大查询中的子查询。