CREATE
USER(7) SQL Commands CREATE USER(7)
NAME
CREATE USER - define a new database user account
SYNOPSIS
CREATE USER username [ [ WITH ] option [ ... ] ]
where option can be:
SYSID uid
| [ ENCRYPTED | UNENCRYPTED ] PASSWORD 'password'
| CREATEDB | NOCREATEDB
| CREATEUSER | NOCREATEUSER
| IN GROUP groupname [, ...]
| VALID UNTIL 'abstime'
DESCRIPTION
CREATE USER will add a new user to an instance of PostgreSQL. Refer to the Administrator's Guide for information about managing users and
authentication. You must be a database superuser to use this command.
PARAMETERS
username
The name of the user.
uid The SYSID clause can be used to choose the PostgreSQL user ID of the user that is being created. It is not at all necessary that
those match the Unix user IDs, but some people choose to keep the numbers the same.
If this is not specified, the highest assigned user ID plus one (with a minimum of 100) will be used as default.
password
Sets the user's password. If you do not plan to use password authentication you can omit this option, but the user won't be able to
connect to a password-authenticated server. The password can be set or changed later, using ALTER USER [alter_user(7)].
ENCRYPTED
UNENCRYPTED
These keywords control whether the password is stored encrypted in pg_shadow. (If neither is specified, the default behavior is
determined by the PASSWORD_ENCRYPTION server parameter.) If the presented string is already in MD5-encrypted format, then it is
stored as-is, regardless of whether ENCRYPTED or UNENCRYPTED is specified. This allows reloading of encrypted passwords during
dump/restore.
See the chapter on client authentication in the Administrator's Guide for details on how to set up authentication mechanisms. Note
that older clients may lack support for the MD5 authentication mechanism that is needed to work with passwords that are stored
encrypted.
CREATEDB
NOCREATEDB
These clauses define a user's ability to create databases. If CREATEDB is specified, the user being defined will be allowed to cre-
ate his own databases. Using NOCREATEDB will deny a user the ability to create databases. If this clause is omitted, NOCREATEDB is
used by default.
CREATEUSER
NOCREATEUSER
These clauses determine whether a user will be permitted to create new users himself. This option will also make the user a supe-
ruser who can override all access restrictions. Omitting this clause will set the user's value of this attribute to be NOCREA-
TEUSER.
groupname
A name of a group into which to insert the user as a new member. Multiple group names may be listed.
abstime
The VALID UNTIL clause sets an absolute time after which the user's password is no longer valid. If this clause is omitted the login
will be valid for all time.
DIAGNOSTICS
CREATE USER
Message returned if the command completes successfully.
NOTES
Use ALTER USER [alter_user(7)] to change the attributes of a user, and DROP USER [drop_user(7)] to remove a user. Use ALTER GROUP
[alter_group(l)] to add the user to groups or remove the user from groups. PostgreSQL includes a program createuser [createuser(1)] that
has the same functionality as this command (in fact, it calls this command) but can be run from the command shell.
EXAMPLES
Create a user with no password:
CREATE USER jonathan;
Create a user with a password:
CREATE USER davide WITH PASSWORD 'jw8s0F4';
Create a user with a password, whose account is valid until the end of 2001. Note that after one second has ticked in 2002, the account is
not valid:
CREATE USER miriam WITH PASSWORD 'jw8s0F4' VALID UNTIL 'Jan 1 2002';
Create an account where the user can create databases:
CREATE USER manuel WITH PASSWORD 'jw8s0F4' CREATEDB;
COMPATIBILITY
The CREATE USER statement is a PostgreSQL extension. The SQL standard leaves the definition of users to the implementation.
SEE ALSO
ALTER USER [alter_user(7)], DROP USER [drop_user(l)], createuser(1)
SQL - Language Statements 2002-11-22 CREATE USER(7)