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update customers a
set city_name=(select b.city_name from tmp_cust_city b where b.customer_id=a.customer_id)
where exists (select 1
from tmp_cust_city b
where b.customer_id=a.customer_id
)
-- update ³¬¹ý2¸öÖµ
update customers a
set (city_name,customer_type)=(select b.city_name,b.customer_type
from tmp_cust_city b
where b.customer_id=a.customer_id)
where exists (select 1
from tmp_cust_city b
where b.customer_id=a.customer_id
)
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CREATE SEQUENCE checkup_no_seq NOCYCLE MAXVALUE 999999 START WITH 2;
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begin
sys.dbms_job.submit(job => :job,
what => 'check_err;',
  ......