If an SQL statement is involved in the system that needs to be queried across two databases, how should the SQL statement be written? See the following DEMO:
1. First of all, you need to set DataBase links in the main library. The specific setting methods are various on the Internet, and I will not introduce them here
(it can be implemented through tools such as plsql, or through relevant command lines)
2. Specific SQL statements DEMO:
select a.account_id, a.account_name, e.facility_id, position
from account@to_basic a
left join account_facility_bind e on (a.account_id = e.account_id)
left join facility@to_basic f on e.facility_id = f.facility_id
where to_basic is the name of the set DataBase links, the others are the table name and attribute
3. Once executed, it's done!
Oracle data multi-database joint query
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