update  lmt_cus_crdt_lmt set ccy = 'CNY' where ccy = '' and create_time >= '2022-04-22';
update  lmt_crdt_lmt  set ccy = 'CNY'   where ccy = '' and create_time >= '2022-04-22';
update  lmt_crdt_agr  set ccy = 'CNY'   where ccy = '' and create_time >= '2022-04-22';
update  lmt_crdt_app  set ccy = 'CNY'   where ccy = '' and create_time >= '2022-04-22';