I am trying to copy an entire table from one database to another in Postgres. Any suggestions?
- 11If you're okay with installing DBeaver, it has a really simple way of transferring between two databases you're connected to. Just right click the source table and select Export Data, target a Database table(s) and set the target as the destination database.rovyko– rovyko2020-03-22 07:55:29 +00:00CommentedMar 22, 2020 at 7:55
- 1@rovyko I'm trying to do the same thing in DBeaver but using dynamic sql. Please let me know if you know how to do it.Roshan Maharjan– Roshan Maharjan2022-08-02 08:30:13 +00:00CommentedAug 2, 2022 at 8:30
30 Answers30
Extract the table and pipe it directly to the target database:
pg_dump -t table_to_copy source_db | psql target_dbNote: If the other database already has the table set up, you should use the-a flag to import data only, else you may see weird errors like "Out of memory":
pg_dump -a -t table_to_copy source_db | psql target_db13 Comments
pg_dump -U remote_user -h remote_server -t table_to_copy source_db | psql target_dbERROR: role "remote_user" does not exist.-a flag fordata only. i.e.pg_dump -a -t my_table my_db | psql target_db. While I'm here, If your database is on a server, I find it easier to just dump the database to a file and then scp that file to the database, then send the contents of the file to psql. e.g.pg_dump -a -t my_table my_db > my_file.sql and after putting that on your server -->psql my_other_db < my_file.sqlpg_dump -t '"tableToCopy"' source_db | psql target_db. Note that single AND double quotes surround the table nameYou can also use the backup functionality in pgAdmin II. Just follow these steps:
- In pgAdmin, right click the table you want to move, select "Backup"
- Pick the directory for the output file and set Format to "plain"
- Click the "Dump Options #1" tab, check "Only data" or "only Schema" (depending on what you are doing)
- Under the Queries section, click "Use Column Inserts" and "User Insert Commands".
- Click the "Backup" button. This outputs to a .backup file
- Open this new file using notepad. You will see the insert scripts needed for the table/data. Copy and paste these into the new database sql page in pgAdmin. Run as pgScript - Query->Execute as pgScript F6
Works well and can do multiple tables at a time.
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Objects section. On OSX, click the SQL button or get theSQL Editor via theTools menu to paste in the SQL copied from the backup file.Usingdblink would be more convenient!
truncate table tableA;insert into tableAselect *from dblink('hostaddr=xxx.xxx.xxx.xxx dbname=mydb user=postgres', 'select a,b from tableA') as t1(a text,b text);5 Comments
Using psql, on linux host that have connectivity to both servers
( export PGPASSWORD=password1 psql -U user1 -h host1 database1 \ -c "copy (select field1,field2 from table1) to stdout with csv" ) \| ( export PGPASSWORD=password2 psql -U user2 -h host2 database2 \ -c "copy table2 (field1, field2) from stdin csv" )4 Comments
PGPASSWORD=password1 psql -U ... then you don't even need explicit subshells! Ordinarily, you'll want to do a couple things to set up first, so subshells may be necessary anyway. Also, the passwords won't be exported into subsequent processes. Thanks!pg_dump -t '<table_name>' --schema-only~/.pgpass.Firstinstall dblink
Then, you would do something like:
INSERT INTO t2 select * from dblink('host=1.2.3.4 user=***** password=****** dbname=D1', 'select * t1') tt( id int, col_1 character varying, col_2 character varying, col_3 int, col_4 varchar );2 Comments
INSERT INTO l_tbl (l_col1, l_col2, l_col3) SELECT * FROM dblink('dbname=r_db hostaddr=r_ip password=r_pass user=r_usr', 'select r_col1, r_col2, r_col3 from r_tbl where r_col1 between ''2015-10-29'' AND ''2015-10-30'' ') AS t1(col1 MACADDR, col2 TIMESTAMP, col3 NUMERIC(7,1)); (l means local, r is remote. Escape single quotes. Provide col types.)If you have both remote server then you can follow this:
pg_dump -U Username -h DatabaseEndPoint -a -t TableToCopy SourceDatabase | psql -h DatabaseEndPoint -p portNumber -U Username -W TargetDatabaseIt will copy the mentioned table of source Database into same named table of target database, if you already have existing schema.
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Use pg_dump to dump table data, and then restore it with psql.
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Here is what worked for me.First dump to a file:
pg_dump -h localhost -U myuser -C -t my_table -d first_db>/tmp/table_dumpthen load the dumped file:
psql -U myuser -d second_db</tmp/table_dump2 Comments
You could do the following:
pg_dump -h <host ip address> -U <host db user name> -t <host table> > <host database> | psql -h localhost -d <local database> -U <local db user>2 Comments
To move a table from database A to database B at your local setup, use the following command:
pg_dump -h localhost -U owner-name -p 5432 -C -t table-name database1 | psql -U owner-name -h localhost -p 5432 database22 Comments
export PGPASSWORD=<passw> before running the commandCombiningthis answer andthis answer, which is more convenient as you don't need to specify the columns:
TRUNCATE TABLE tableA;INSERT INTO tableASELECT (rec).*FROM dblink('hostaddr=xxx.xxx.xxx.xxx dbname=mydb user=postgres', 'SELECT myalias FROM tableA myalias') AS t1(rec tableA);Same as answers byuser5542464 andPiyush S. Wanare but split in two steps:
pg_dump -U Username -h DatabaseEndPoint -a -t TableToCopy SourceDatabase > dumpcat dump | psql -h DatabaseEndPoint -p portNumber -U Username -W TargetDatabaseotherwise the pipe asks the two passwords in the same time.
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I was usingDataGrip (By Intellij Idea). and it was very easy copying data from one table (in a different database to another).
First, make sure you are connected with both DataSources in Data Grip.
Select Source Table and press F5 or (Right-click -> Select Copy Table to.)
This will show you a list of all tables (you can also search using a table name in the popup window). Just select your target and press OK.
DataGrip will handle everything else for you.
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pg_dump does not work always.
Given that you have the same table ddl in the both dbs you could hack it from stdout and stdin as follows:
# grab the list of cols straight from bash psql -d "$src_db" -t -c \ "SELECT column_name FROM information_schema.columns WHERE 1=1 AND table_name='"$table_to_copy"'" # ^^^ filter autogenerated cols if needed psql -d "$src_db" -c \ "copy ( SELECT col_1 , col2 FROM table_to_copy) TO STDOUT" |\ psql -d "$tgt_db" -c "\copy table_to_copy (col_1 , col2) FROM STDIN"Comments
I tried some of the solutions here and they were really helpful. In my experience best solution is to usepsql command line, but sometimes i don't feel like using psql command line. So here is another solution forpgAdminIII
create table table1 as( select t1.* from dblink( 'dbname=dbSource user=user1 password=passwordUser1', 'select * from table1' ) as t1( fieldName1 as bigserial, fieldName2 as text, fieldName3 as double precision ) )The problem with this method is that the name of the fields and their types of the table you want to copy must be written.
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Check thispython script
python db_copy_table.py "host=192.168.1.1 port=5432 user=admin password=admin dbname=mydb" "host=localhost port=5432 user=admin password=admin dbname=mydb" alarmrules -w "WHERE id=19" -vSource number of rows = 2INSERT INTO alarmrules (id,login,notifybyemail,notifybysms) VALUES (19,'mister1',true,false);INSERT INTO alarmrules (id,login,notifybyemail,notifybysms) VALUES (19,'mister2',true,false);Comments
As an alternative, you could also expose your remote tables as local tables using the foreign data wrapper extension. You can then insert into your tables by selecting from the tables in the remote database. The only downside is that it isn't very fast.
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forDBeaver tool users, you can"Export data" to table in another database.
Only error I kept facing was because ofwrong postgres driver.
SQL Error [34000]: ERROR: portal "c_2" does not exist ERROR: Invalid protocol sequence 'P' while in PortalSuspended state.Here is a official wiki on how to export data:https://github.com/dbeaver/dbeaver/wiki/Data-transfer
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If the both DBs(from & to) are password protected, in that scenario terminal won't ask for the password for both the DBs, password prompt will appear only once.So, to fix this, pass the password along with the commands.
PGPASSWORD=<password> pg_dump -h <hostIpAddress> -U <hostDbUserName> -t <hostTable> > <hostDatabase> | PGPASSWORD=<pwd> psql -h <toHostIpAddress> -d <toDatabase> -U <toDbUser>Comments
You can do inTwo simple steps:
# dump the database in custom-format archivepg_dump -Fc mydb > db.dump# restore the databasepg_restore -d newdb db.dumpIn case ofRemote Databases:
# dump the database in custom-format archivepg_dump -U mydb_user -h mydb_host -t table_name -Fc mydb > db.dump# restore the databasepg_restore -U newdb_user -h newdb_host -d newdb db.dump1 Comment
Having done this wrong several times, I'll contribute a solution to SAFELY and RELIABLY copy a table from one remote db to another. There's a lot that can go wrong between the dump and restore. For clarity, some additional criteria in this solution:
- Copy only one table
- Does not delete anything in either source/dest database
- Makes sure the id sequence resumes in the to_table, instead of resetting to 1
- Avoids
drop tableor--cleanmistakes from hasty copy-paste - Separates dump and restore into two different steps
- Allows flexibility in customizing the to_table (different indexes, etc)
- Both databases are remote
- Each database has a different hostname, port, username, pass
Prerequsites: getpg_dump,pg_restore,psql matching the remote db version
# Figure out which database version is running# to use the pg_dump, pg_restore with the version.# Run the query:# select version() # PostgreSQL 14.10# Then install the matching versionbrew tap homebrew/versionsbrew search postgresql@brew install postgresql@14# Later we can switch backbrew install postgresql@16Export a table from the remote db,including all large objects in the table
# Dump from 10.0.1.123:1234## -Fc Uses "format custom" optimized for pg_restore# -b include all large objects, i.e. blobs, bytea, etc# -U username# -h hostname# -p port# -a only include table data and large objects# -t table name# PGPASSWORD is the supported env var to pass in a passwordPGPASSWORD="FROM-DB-PASSWORD" pg_dump -Fc -b -U FROM-DB-USERNAME -h 10.0.1.123 -p 1234 -a -t from_table from_db_name > from_table.dump# Get the last id sequence for restore laterpsql -h 10.0.1.123 -p 1234 -d from_db_name -U FROM-DB-USERNAME -W -c "select * from from_table_name_id_seq;"# last_value == 9999Import the table into another remote db
# NO CLEAN, NO DROP/DELETE## Safely create a table with a different name for now.# This helps avoid copy-paste errors accidentally# importing back to or deleting things in from_db.psql -h 10.0.1.456 -p 4567 -d to_db_name -U TO-DB-USERNAME -W -c "create table to_table (id bigserial not null primary key, . . . );"# Restore to 10.0.1.456:4567## -U username# -h hostname# -p port# -a only include table data and large objects# -t table name# -d database namePGPASSWORD="TO-DB_PASSWORD" pg_restore -h 10.0.1.456 -p 4567 -d to_db_name -U TO-DB-USERNAME -a -t to_table_name from_table.dump# Restore the id sequence we got from the last export step above.psql -h 10.0.1.456 -p 4567 -d to_db_name -U TO-DB-USERNAME -W -c "alter sequence to_table_name_id_seq restart with 9999;"# Rename the table to match the from_table_namepsql -h 10.0.1.456 -p 4567 -d to_db_name -U TO-DB-USERNAME -W -c "alter table to_table_name rename to name_matching_from_table_name;"# Cleanuprm from_table.dumpComments
You have to use DbLink to copy one table data into another table at different database. You have to install and configure DbLink extension to execute cross database query.
I have already created detailed post on this topic.Please visit this link
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On my mac using a| asked for two passwords at the same time which didn't work. here is what I did.
pg_dump -h {host} -U {user} -t {table} {db} | psql postgresql://{user}:{password}@{host}:{port}/{db}Comments
It could be done fairly simple manner.Just use the following command
pg_dump –U <user_name> –t <table_name> <source_database> | psql –U <user_name> <targeted_database>replace values in <> with your specific parameters and also remove <>.
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if you want to copy data from one server database to another server database then you have createdblink connection both database otherwise you can export the table data in csv and import the data in other database table, table fields should be same as primary table.
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Without any piping, on Windows, you can use:
Dump - Edit this to be on one line
"C:\Program Files\PostgreSQL\14\bin\pg_dump.exe"--host="host-postgres01"--port="1234"--username="user01"-t "schema01.table01"--format=c-f "C:\Users\user\Downloads\table01_format_c.sql""DB-01"Restore - Edit this to be on one line
"C:\Program Files\PostgreSQL\14\bin\pg_restore.exe"--host="host-postgres02"--port="5678"--username="user02"-1--dbname="DB-02""C:\Users\user\Downloads\table01_format_c.sql"You will be prompted for user passwords.
This solution will put the new table in a schema with the same name (schema01).
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-1 for?for postgres version >= 8.4.0 the below worked for me
pg_dump -U user -h host --column-inserts --data-only --table=table_name database_name | psql -h host -p port -U user -W database_name1 Comment
bash -c "psql [postgres connection string B] -c 'TRUNCATE \"TABLE NAME\";' && pg_dump -a -t '\"TABLE NAME\"' -d [postgres connection string A] | psql [postgres connection string B]"I'm on fish shell, sharing this if anyone is still struggling.
This does 3 things
- Truncate the destination table
- Dump the table from source DB
- Pipe to the destination DB via psql
This is in memory data replication
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If you run pgAdmin (Backup:pg_dump, Restore:pg_restore) from Windows it will try to output the file by default toc:\Windows\System32 and that's why you will get Permission/Access denied error and not because the user postgres is not elevated enough.RunpgAdmin as Administrator or just choose a location for the output other than system folders of Windows.
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Just use CREATE TABLE:
CREATE TABLE new_table AS TABLE existing_table;1 Comment
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