SELECT e.id AS id,e.age AS age,e.bmgw_id AS bmgwId,b.`name` AS gw,bb.`name` AS bm, p.`name` AS proname,d.`name` AS eduname,e.job_status AS jobStatus,datediff(CURDATE(),e.rz_time) AS workage
SELECT e.id AS id,IFNULL(e.age,0) AS age,IFNULL(e.bmgw_id,0) AS bmgwId,IFNULL(b.`name`,'null') AS gw,IFNULL(bb.`name`,'null') AS bm,IFNULL( p.`name`,'null') AS proname,IFNULL(d.`name` ,'null')AS eduname,IFNULL(e.job_status,0) AS jobStatus,IFNULL(datediff(CURDATE(),e.rz_time),0)AS workage
FROM yggl_main_emp e
LEFT JOIN zzgl_bmgw_m b ON b.id = e.bmgw_id
LEFT JOIN zzgl_bmgw_m bb ON bb.id = b.up_id
LEFT JOIN province_class p ON left (e.`jg`,2) = p.province