PostgreSQL：如何将数据从一个数据库表复制到另一个数据库

Question

I need simple example how to copy data from database DB1 table T1 to database DB2 table T2 .

T2 has identical structure like T1 (same column names, properties. Just different data) DB2 running on same server like DB1, but on different port.

Answer 1

In the case the two databases are on two different server instances, you could export in CSV from db1 and then import the data in db2 :

COPY (SELECT * FROM t1) TO '/home/export.csv';

and then load back into db2 :

COPY t2 FROM '/home/export.csv';

Again, the two tables on the two different database instances must have the same structure.

Using the command line tools : pg_dump and psql , you could do even in this way :

pg_dump -U postgres -t t1 db1 | psql -U postgres -d db2

You can specify command line arguments to both pg_dump and psql to specify the address and/or port of the server .

Another option would be to use an external tool like : openDBcopy , to perform the migration/copy of the table.

Answer 2

你可以尝试这个 -

 pg_dump -t table_name_to_copy source_db | psql target_db