为某些连接数据设置特定值

Question

我想添加一个列，以便将用户标记为来自view_all_involved_users.scientist_id为scientist，而将其他用户标记为others

VIEW `view_all_involved_users2` AS

SELECT DISTINCT
    `tbl_user`.`user_id` AS `user_id`,
    `tbl_user`.`name` AS `name`,
    `view_all_involved_users`.`flagship_activity_id` AS `flagship_activity_id`
FROM
    (`tbl_user`
    LEFT JOIN `view_all_involved_users` ON (((`view_all_involved_users`.`flagship_leader` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`flagship_activity_focalpoint_id` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`flagship_activity_coleader_id` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`output_leader_id` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`output_coleader_id` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`scientist_id` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`clustuer_coordinator_id` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`scientist_id` = `tbl_user`.`user_id`)
        OR (`view_all_involved_users`.`clustuer_cocoordinator_id` = `tbl_user`.`user_id`))))

Answer 1

(CASE WHEN ISNULL(tbl_flagship_activity_result_scientists.user_id) THEN 'contact' ELSE 'scientist' END) AS type