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Create the following simple model and construct some test data:

in a certain service acceptance subsystem BSS,

--customer data table create customers(customer_id number(8) not null, --customer identifier city_name varchar2(10) not null, --city customer_type char(2) not null, --customer type...) create unique index PK_customers on customers (customer_id)

For some reason, the information of the city where the customer is located is not accurate, but in the CRM subsystem of the customer service department, accurate information such as the city where 20% of the customers are located is obtained through active service, so you extract this information into a temporary table:

create table tmp_cust_city(customer_id number(8) not null,citye_name varchar2(10) not null，customer_type char(2) not null)

1)the simplest form

--It is confirmed that all customers with customer_id less than 1000 in customers table are 'Beijing'--1000 are old customers in this city before the company goes nationwide:)update customersset city_name ='Beijing'where customer_id=2)

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