\copy

Description

Performs a frontend (client) copy. This is an operation that runs an SQL COPY command, but instead of the server reading or writing the specified file, psql reads or writes the file and routes the data between the server and the local file system. This means that file accessibility and privileges are those of the local user, not the server, and no SQL superuser privileges are required.

Client

psql 18.6

Case-sensitive spelling

\copy

Usage

\copy { table [ ( column_list ) ] } from { 'filename' | program 'command' | stdin | pstdin } [ [ with ] ( option [, ...] ) ] [ where condition ] \copy { table [ ( column_list ) ] | ( query ) } to { 'filename' | program 'command' | stdout | pstdout } [ [ with ] ( option [, ...] ) ]

Related entries

• psql command-line options and complete manual

Documentation and source

• 18.6 English manual · app-psql.html

Compare versions

PostgreSQL 10 → 11: changed.

--- PostgreSQL 10
+++ PostgreSQL 11
@@ -1,5 +1,5 @@
 {
-  "definition": "Performs a frontend (client) copy. This is an operation that runs an SQL COPY command, but instead of the server reading or writing the specified file, psql reads or writes the file and routes the data between the server and the local file system. This means that file accessibility and privileges are those of the local user, not the server, and no SQL superuser privileges are required. When program is specified, command is executed by psql and the data passed from or to command is routed between the server and the client. Again, the execution privileges are those of the local user, not the server, and no SQL superuser privileges are required. For \\copy ... from stdin , data rows are read from the same source that issued the command, continuing until \\. is read or the stream reaches EOF . This option is useful for populating tables in-line within a SQL script file. For \\copy ... to stdout , output is sent to the same place as psql command output, and the COPY count command status is not printed (since it might be confused with a data row). To read/write psql 's standard input or output regardless of the current command source or \\o option, write from pstdin or to pstdout . The syntax of this command is similar to that of the SQL COPY command. All options other than the data source/destination are as specified for COPY . Because of this, special parsing rules apply to the \\copy meta-command. Unlike most other meta-commands, the entire remainder of the line is always taken to be the arguments of \\copy , and neither variable interpolation nor backquote expansion are performed in the arguments. Tip Another way to obtain the same result as \\copy ... to is to use the SQL COPY ... TO STDOUT command and terminate it with \\g filename or \\g | program . Unlike \\copy , this method allows the command to span multiple lines; also, variable interpolation and backquote expansion can be used. Tip These operations are not as efficient as the SQL COPY command with a file or program data source or destination, because all data must pass through the client/server connection. For large amounts of data the SQL command might be preferable.",
+  "definition": "Performs a frontend (client) copy. This is an operation that runs an SQL COPY command, but instead of the server reading or writing the specified file, psql reads or writes the file and routes the data between the server and the local file system. This means that file accessibility and privileges are those of the local user, not the server, and no SQL superuser privileges are required. When program is specified, command is executed by psql and the data passed from or to command is routed between the server and the client. Again, the execution privileges are those of the local user, not the server, and no SQL superuser privileges are required. For \\copy ... from stdin , data rows are read from the same source that issued the command, continuing until \\. is read or the stream reaches EOF . This option is useful for populating tables in-line within a SQL script file. For \\copy ... to stdout , output is sent to the same place as psql command output, and the COPY count command status is not printed (since it might be confused with a data row). To read/write psql 's standard input or output regardless of the current command source or \\o option, write from pstdin or to pstdout . The syntax of this command is similar to that of the SQL COPY command. All options other than the data source/destination are as specified for COPY . Because of this, special parsing rules apply to the \\copy meta-command. Unlike most other meta-commands, the entire remainder of the line is always taken to be the arguments of \\copy , and neither variable interpolation nor backquote expansion are performed in the arguments. Tip Another way to obtain the same result as \\copy ... to is to use the SQL COPY ... TO STDOUT command and terminate it with \\g filename or \\g | program . Unlike \\copy , this method allows the command to span multiple lines; also, variable interpolation and backquote expansion can be used. Tip These operations are not as efficient as the SQL COPY command with a file or program data source or destination, because all data must pass through the client/server connection. For large amounts of data the SQL command might be preferable. Also, because of this pass-through method, \\copy ... from in CSV mode will erroneously treat a \\. data value alone on a line as an end-of-input marker.",
   "modifiers": [],
   "signature": "\\copy { table [ ( column_list ) ] | ( query ) } { from | to } { 'filename' | program 'command' | stdin | stdout | pstdin | pstdout } [ [ with ] ( option [, ...] ) ]",
   "spellings": [

Compares recorded interfaces and attributes. Source fingerprints and build metadata are excluded; an absent sample is not proof of the introduction or removal release.

Related entries

• \lo_export
• \lo_import
• \lo_list
• \lo_unlink