Oracle左连接

select q.dbid, lc.dbid lc_id, a.email

from t_qt_sj_sjhdgl_sqjlb q

left join t_qt_sj_sjhdgl_sqjlb_lc lc

on q.dbid = lc.sqjlb_id

left join t_qt_jc_account a

on q.userid = a.username

where q.dqlc = ‘ytgdxd’

and ROUND(TO_NUMBER(sysdate - lc.kssj) * 24) > 48

and q.dbid not in

(select z.dbid fff from T_QT_JC_ZNXX z where lc.dbid = z.lc_id)

or q.dbid in (select zz.dbid fff

from T_QT_JC_ZNXX zz

where lc.dbid = zz.lc_id

and fsjg = ‘1’)