How to generate the "create table" sql statement for an existing table in postgreSQL
Here is explained how to generate such script for one table, but how to do the same for whole database?
I need to extract the script that creates the database and all tables in it.
pgdump -s databasename does this
pgdump -s databasename | awk 'RS="";/TABLE[^;]*;/' allows extract statements of table creating/altering. Unfortunately I don't understand awk syntax.
Related
I need to play around with a data syncing program I wrote, but I want to copy the structure of the production database into a new table on my localhost Postgres database, without copying the data to my localhost db.
I was thinking along the lines of
CREATE TABLE new_table AS
TABLE existing_table
WITH NO DATA;
But I am unsure how to modify it to work with 2 different databases.
Any help would be appreciated
This boils down to the question "how to create the DDL script for a table" which can easily be done using pg_dump on the command line.
pg_dump -d some_db -h production_server -t existing_table --schema-only -f create.sql
The file create.sql then contains the CREATE TABLE script that you can run on your local Postgres installation.
I have tables from different databases , and i want to create a data warehouse database that contains table replicas from different tables from different databases. I want the data in the warehouse to be synced with the data from the other tables everyday.I am using postgresql
I tried to do this using psql :
pg_dump -t table_to_copy source_db | psql target_db
However it didnt work as it keeps stating errors like table does no exist.
It all worked when i dumped the whole dabatase not only a single table, but however i want the data to be synced and i want to copy tables from different databases not the whole database.
How can i do this?
Thanks!
Probably you need FDW - Foreign Data Wrapper. You can create foreign tables for different external db in different schemas on local db. All tables accessible by local queries. For storing snap you can use local tables with just INSERT INTO local_table_YYYY_MM SELECT * FROM remote_table; .
1
pg_dump -t <table name> <source DB> | psql -d <target DB>
(Check the table name correctly and it says for you , table doesn't exist)
2
pg_dump allows the dumping of only select tables:
pg_dump -Fc -f output.dump -t tablename databasename
(dump 'tablename' from database 'databasename' into file 'output.dump' in pg_dumps binary custom format)
You can restore that pg_restore:
pg_restore -d databasename output.dump
If the table itself already exists in your target database, you can import only the rows by adding the --data-only flag.
Dblink
You can not perform cross database query like SQL Server, PostgreSQL does not support this. DbLink extension of PostgreSQL which is used to connect one database to another database. You have to install and configure DbLink to execute cross database query.
Here is the step by step script and example for executing cross database query in PostgreSQL. Please visit this post:
Given an existing database in PostgreSQL, I want to get the required SQL code to generate an identical database with no records.
Is there any easy way to do so?
You can use pg_dump command to do that. The option -s dumps only the schema and no data from the database.
I have a little problem. My friend has a database with over 10 tables and each table has over 90-100 records.
I can't find a workaround to export the records (to put in a SQL file something like this: INSERT INTO .... VALUES ... for each existing records) from his tables to import in my database.
How to do that ?
I tried: right click on a table -> Script Table as -> INSERT TO -> File ...
but it only generate the INSERT statement.
There are a solution ? or this feature is only for commercial version ?
UPDATE
You can use BCP command with command prompt like this
For export: bcp ADatabase.dbo.OneTable out d:\test\OneTable.bcp -c -Usa -Ppassword
For import: bcp ADatabase.dbo.OneTable in d:\test\OneTable.bcp -c -Usa -Ppassword
these commands will create a BCP file which contains records for specified table. You can import using existing BCP file into another database
If you use remote database then:
bcp ADatabaseRemote.dbo.OneTableRemote out d:\test\OneTableRemote.bcp -Slocalhost/SQLExpress -Usa -Ppassword
Instead of localhost/SQLExpress, you can use localhost or other server name...
Probably the simplest way to do this would be to run a SELECT statement that outputs to a file. Then you can import that data into your database.
For simple moves, I have also done a copy/paste manually. Sometimes it is better to use Excel as a staging platform before pasting it into the new database. You may need to create a temporary table in your new database that matches up exactly with the data you are pasting over. For example, I usually don't put a PK on the temp table at first and make the PK field just an INT. That way the copy will go smoother.
In the corporate world, you would use SSIS to move this data around.
a couple of ways you could do this. One,select everything from each table and save the results as a csv or delimited file (you can do this from sql management studio). You can also script the tables as create and copy the scripts over to the new database, assuming it is a sql server also. Then for import use the load infile statement. You may have to google the syntax for sql server but I know this works in mysql and oracle. haven't tried it in sql server yet.
LOAD DATA INFILE 'myfile'
INTO TABLE stuff
FIELDS TERMINATED BY ','
LINES TERMINATED BY '\n'
SET id = NULL;
Or if you are going to another sql server use the sql export import wizard.
http://msdn.microsoft.com/en-us/library/ms141209.aspx
Hai i am a beginner of Database,
i have a .sql file which contains some tables of data, i want to know how to import them and how to view the list of tables.
presently im using the following:-
software or editor : navicat lite
server : localhost.
databse file format: .sql
Maybe you can try to execute the script in sql server, then type
select * from [database_name].information_schema.tables
to view tables and relevant information.
Remember that a sql file is not really a database, it is a script. You can run the script from any tool, but I'd use command line. This is navicat connected to mysql?
mysql -u username -p databasename < script.sql
password: **
And then the results can be seen using navicat or any other tool
If the .sql file has statements such as "CREATE TABLE..." and then later on "INSERT INTO..." then the script is possibly creating the tables and inserting the data.
To allow that to happen, the tables need to not exist in the database. You can then run the script and it will create the tables and fill in the data.
If the tables do exist, you can always either delete them, or change the CREATE to an ALTER and the script should then run.
Hope that helps.