Since the server doesn't know what directory a user is in when they execute a statement, this means that all file paths have to be absolute. This means that any file paths included in SQL statements are interpreted by the server. This is because SQL statements that are entered at the psql prompt are sent to the server before they are executed. In other words, input file or output file has to be in the database server. from another computer), we cannot use COPY command from the remote computer. If we connect to the database remotely (E.g. Understanding COPY and \copy statementsĬOPY command is to input and output data between database and file only in the database server. I am not going to cover the pg_dump and pg_restore methods here as there are a lot of resources out there explaining those in detail. Let's explore various options for copying data to from local/remote servers. What if I say that you can even do a remote copy of data from one database to another over ssh. Well, PostgreSQL also has a \copy statement which can be quite handy in this case. It might not be a good idea to do a dump of 100s of Gigs to your local system and then copy to the remote host and restore. You can take a data dump as an SQL file or as a CSV from your PostgreSQL instance and do a restore.īut what happens when you are dealing with Gigs of data? Unfortunately, PostgreSQL doesn't provide a native way to create a new table from a CSV file.Its very common use case to copy data from one database instance to another be it from local to staging, staging to production etc.įor copying data from one PostgreSQL instance to another, there are a couple of techniques. Creating a Postgres Table from a CSV file The null_value_not_allowed error indicates that the CSV file contains null values and the import is trying to insert that into the table which has a not null constraint. null_value_not_allowed: Not null violation The invalid_parameter_value error could indicate that the CSV file is not encoded in UTF-8, which may result in the import failing or the data being corrupted. invalid_parameter_value: Incorrect encoding The datatype_mismatch error indicates that the data types of the columns in the CSV file do not match the data types of the columns in the target table. The syntax_error indicates that the format of the CSV file or the delimiter used in the file does not match the specifications provided in the import command, which may result in the import failing or the data being corrupted. syntax_error: Incorrect format or delimiter Make sure that the file actually exists, and that the provided file path is valid. The undefined_file error indicates that the file you are trying to import doesn’t exist. Here is a list of the most common errors you might encounter, and that you will need to resolve before the file can successfully be imported. Importing a CSV file might fail for various reasons. It allows you to import data into a table by going to the "Import/Export" option, selecting the file to import, specifying the format, delimiter, encoding, and the column names. It is also possible to import a CSV file in PostgreSQL using GUI tools such as pgAdmin, a popular open-source management tool for PostgreSQL. Note that the WITH clause is optional, but it allows you to specify the format of the file (CSV), whether the first row contains header information (HEADER true), and the delimiter used in the file (DELIMITER ',').
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