mysql 多个字段合并

group_concat  函数
默认“，”合并

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

用指定符号分割

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

多个字段用指定的符号分割

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