group_concat  函數
默認“，”合並

select 
        p.id as patent_id,p.application_no,p.name,p.inventer,group_concat(pi.`name`) as sys_inventer
        from ip_patent

用指定符號分割

select 
        p.id as patent_id,p.application_no,p.name,p.inventer,group_concat(pi.`name` separator ‘;‘) as sys_inventer
        from ip_patent
 

多個字段用指定的符號分割

SELECT 
            p.id as patent_id,p.application_no,p.name,p.applicant,p.inventer,
            group_concat(CONCAT(u.`name`, ‘(‘, u.`code`, ‘)‘) SEPARATOR ‘;‘) AS sys_inventer,p.tenant_id

mysql 多個字段合並