Psql Some of the operation commands to learn

D:\Program files\postgresql\9.3\scripts
This is the default buffer position of the psql;
Psql's command: D:\Program files\postgresql\9.3\scripts\runpsql.bat
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Query buffer
\e [file] [line] Edit query buffer (or file) using external editor
\EF [FUNCNAME [line]] Edit function definition using external editor
\p Display the contents of the query buffer
\ r Reset (clear) the query buffer
The \w file writes the contents of the query buffer to the file

Input/Output
\copy ... Execute SQL COPY to send the data stream to the client host
\echo [string] writes a string to standard output
\i files to execute commands from a file
\ir FILE is similar to \i, but relative to the location of the current script
\o [file] writes all query results to a file or | pipeline
\qecho [string] writes a string to the query output stream (reference \o)
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The default of these related files is put into this; \postgresql\9.3\scripts
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\CD is the one that can switch this directory.
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Commands are divided into,
In general:
\watch [SEC]: Execute a statement query first, then \watch 2 execution, identify every 2s to execute the query again;
\h Name: \h Select will list the usage instructions for the Select
\q: Exit Psql
License Terms for \copyright PostgreSQL
\g Execute Query: SELECT * FROM mytable \g QQQ Place Query results in file or pipeline
or yes;: SELECT * FROM MyTable; The QQQ function is the same as last
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Buffer:
\e uses an external editor to query; The command opens an external editor, such as Notepad, which allows you to enter a command that executes the command when it is closed;
\EF editing functions
\p Viewing buffer contents
\ r Reset Buffer
\w writes the contents of the query buffer to the file: \w filename File exists runplsql.bat location by default
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Input and output:
\copy ... If it is remote, execute SQL COPY and send the data stream to the client host
\echo [string] writes a string to standard output
\i files execute command files from a file the default location is also ... \postgresql\9.3\scripts
\o [file] writes all query results to the file or | Pipeline this is the operation of the file, the file query results into the file, and the preceding \g or semicolon; These are followed by a command that places the query results in a file;
\qecho [string] writes a string to the query output stream (reference \o)
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command of informational information
(option: S = Display System object, + = rest details)
\d[s+] Lists tables, views, and sequences
\d[s+] Name Description table, view, sequence, or index
\da[s] [mode] lists aggregate functions
\db[+] [mode] List table space
\dc[s+] [PATTERN] list conversion
\dc[+] [PATTERN] lists type casts
\dd[s] [PATTERN] shows an object description that is not displayed elsewhere
\DDP [mode] List default permissions
\dd[s+] [PATTERN] lists common domains
\det[+] [PATTERN] Lists reference tables
\des[+] [mode] lists external servers
\deu[+] [mode] list user mappings
\dew[+] [mode] lists external data wrappers
\df[antw][s+] [mode] list [include aggregate/general/trigger/window] function
\df[+] [mode] List text search configuration
\dfd[+] [mode] Lists text search dictionaries
\dfp[+] [mode] List text Search parser
\dft[+] [mode] List text Search template
\dg[+] [PATTERN] Lists roles
\di[s+] [mode] List index
\DL lists large objects with the same functionality as \lo_list
\dl[s+] [PATTERN] Lists all process languages
\dm[s+] [PATTERN] Lists all materialized views
\dn[s+] [pattern] Lists all modes
\do[s] [schema] list operators
\do[s+] [PATTERN] Lists all proofing rules
\DP [mode] lists access permissions for tables, views, and sequences
\drds [Mode 1 [Mode 2]] lists the role settings for each database
\ds[s+] [mode] list sequence
\dt[s+] [mode] List table
\dt[s+] [mode] list data types
\du[+] [PATTERN] Lists roles
\dv[s+] [mode] List view
\de[s+] [PATTERN] Lists reference tables
\dx[+] [PATTERN] lists extensions
\dy [PATTERN] Lists all event triggers
\l[+] [PATTERN] Lists all databases
\sf[+] FUNCNAME display function definition
\z [mode] and \DP function the same
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Display formatting:
\a Toggle between alignment and non-aligned modes
\h switch to HTML output mode. Default off
\pset NAME [VALUE] setting table Output Options
(NAME: = {format|border|expanded|fieldsep|fieldsep_zero|footer|null|numericlocale|recordsep|recordsep_zero| Tuples_only|title|tableattr|pager})
\ t switch to show record without caption, and display record and title

  \ t [string]         Set HTML < table > tag properties, or if not, cancel settings
  \x [ on|off|auto]       Toggle Extended Output mode (currently off)
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Connection Operation
\c[ Onnect] [Database name |-User name |-Host |-Port |]
                  Connect to a new database (currently "Postgres")
  \encoding [encode name] Display or set client encoding
  \password [USERNAME ]  securely change passwords for users
  \conninfo               Display information about the current connection
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Commands related to the operating system:
  \CD [directory]      Change the current working directory
  \SETENV NAME [value]   set or empty environment variables
 \timing [on | off]        Toggle Command Timing switch (currently off)
  \! [Command]      execute commands in the shell or start an interactive shell

]

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Variable
\prompt [text] name prompts the user to set internal variables
\set [name [value]] SET internal variable, if no argument lists all variables
\unset name Empty (delete) internal variable

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Large Object
\lo_export loboid File
\lo_import file [Note]
\lo_list
\lo_unlink loboid Large Object operation