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'\" t
.\" Title: ALTER DOMAIN
.\" Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\" Date: 2017-11-06
.\" Manual: PostgreSQL 9.2.24 Documentation
.\" Source: PostgreSQL 9.2.24
.\" Language: English
.\"
.TH "ALTER DOMAIN" "7" "2017-11-06" "PostgreSQL 9.2.24" "PostgreSQL 9.2.24 Documentation"
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.SH "NAME"
ALTER_DOMAIN \- change the definition of a domain
.\" ALTER DOMAIN
.SH "SYNOPSIS"
.sp
.nf
ALTER DOMAIN \fIname\fR
{ SET DEFAULT \fIexpression\fR | DROP DEFAULT }
ALTER DOMAIN \fIname\fR
{ SET | DROP } NOT NULL
ALTER DOMAIN \fIname\fR
ADD \fIdomain_constraint\fR [ NOT VALID ]
ALTER DOMAIN \fIname\fR
DROP CONSTRAINT [ IF EXISTS ] \fIconstraint_name\fR [ RESTRICT | CASCADE ]
ALTER DOMAIN \fIname\fR
RENAME CONSTRAINT \fIconstraint_name\fR TO \fInew_constraint_name\fR
ALTER DOMAIN \fIname\fR
VALIDATE CONSTRAINT \fIconstraint_name\fR
ALTER DOMAIN \fIname\fR
OWNER TO \fInew_owner\fR
ALTER DOMAIN \fIname\fR
RENAME TO \fInew_name\fR
ALTER DOMAIN \fIname\fR
SET SCHEMA \fInew_schema\fR
.fi
.SH "DESCRIPTION"
.PP
\fBALTER DOMAIN\fR
changes the definition of an existing domain\&. There are several sub\-forms:
.PP
SET/DROP DEFAULT
.RS 4
These forms set or remove the default value for a domain\&. Note that defaults only apply to subsequent
\fBINSERT\fR
commands; they do not affect rows already in a table using the domain\&.
.RE
.PP
SET/DROP NOT NULL
.RS 4
These forms change whether a domain is marked to allow NULL values or to reject NULL values\&. You can only
SET NOT NULL
when the columns using the domain contain no null values\&.
.RE
.PP
ADD \fIdomain_constraint\fR [ NOT VALID ]
.RS 4
This form adds a new constraint to a domain using the same syntax as
CREATE DOMAIN (\fBCREATE_DOMAIN\fR(7))\&. When a new constraint is added to a domain, all columns using that domain will be checked against the newly added constraint\&. These checks can be suppressed by adding the new constraint using the
NOT VALID
option; the constraint can later be made valid using
\fBALTER DOMAIN \&.\&.\&. VALIDATE CONSTRAINT\fR\&. Newly inserted or updated rows are always checked against all constraints, even those marked
NOT VALID\&.
NOT VALID
is only accepted for
CHECK
constraints\&.
.RE
.PP
DROP CONSTRAINT [ IF EXISTS ]
.RS 4
This form drops constraints on a domain\&. If
IF EXISTS
is specified and the constraint does not exist, no error is thrown\&. In this case a notice is issued instead\&.
.RE
.PP
RENAME CONSTRAINT
.RS 4
This form changes the name of a constraint on a domain\&.
.RE
.PP
VALIDATE CONSTRAINT
.RS 4
This form validates a constraint previously added as
NOT VALID, that is, verify that all data in columns using the domain satisfy the specified constraint\&.
.RE
.PP
OWNER
.RS 4
This form changes the owner of the domain to the specified user\&.
.RE
.PP
RENAME
.RS 4
This form changes the name of the domain\&.
.RE
.PP
SET SCHEMA
.RS 4
This form changes the schema of the domain\&. Any constraints associated with the domain are moved into the new schema as well\&.
.RE
.PP
You must own the domain to use
\fBALTER DOMAIN\fR\&. To change the schema of a domain, you must also have
CREATE
privilege on the new schema\&. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have
CREATE
privilege on the domain\*(Aqs schema\&. (These restrictions enforce that altering the owner doesn\*(Aqt do anything you couldn\*(Aqt do by dropping and recreating the domain\&. However, a superuser can alter ownership of any domain anyway\&.)
.SH "PARAMETERS"
.PP
.PP
\fIname\fR
.RS 4
The name (possibly schema\-qualified) of an existing domain to alter\&.
.RE
.PP
\fIdomain_constraint\fR
.RS 4
New domain constraint for the domain\&.
.RE
.PP
\fIconstraint_name\fR
.RS 4
Name of an existing constraint to drop or rename\&.
.RE
.PP
\fINOT VALID\fR
.RS 4
Do not verify existing column data for constraint validity\&.
.RE
.PP
CASCADE
.RS 4
Automatically drop objects that depend on the constraint\&.
.RE
.PP
RESTRICT
.RS 4
Refuse to drop the constraint if there are any dependent objects\&. This is the default behavior\&.
.RE
.PP
\fInew_name\fR
.RS 4
The new name for the domain\&.
.RE
.PP
\fInew_constraint_name\fR
.RS 4
The new name for the constraint\&.
.RE
.PP
\fInew_owner\fR
.RS 4
The user name of the new owner of the domain\&.
.RE
.PP
\fInew_schema\fR
.RS 4
The new schema for the domain\&.
.RE
.SH "NOTES"
.PP
Currently,
\fBALTER DOMAIN ADD CONSTRAINT\fR
and
\fBALTER DOMAIN SET NOT NULL\fR
will fail if the named domain or any derived domain is used within a composite\-type column of any table in the database\&. They should eventually be improved to be able to verify the new constraint for such nested columns\&.
.SH "EXAMPLES"
.PP
To add a
NOT NULL
constraint to a domain:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DOMAIN zipcode SET NOT NULL;
.fi
.if n \{\
.RE
.\}
.sp
To remove a
NOT NULL
constraint from a domain:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DOMAIN zipcode DROP NOT NULL;
.fi
.if n \{\
.RE
.\}
.PP
To add a check constraint to a domain:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DOMAIN zipcode ADD CONSTRAINT zipchk CHECK (char_length(VALUE) = 5);
.fi
.if n \{\
.RE
.\}
.PP
To remove a check constraint from a domain:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DOMAIN zipcode DROP CONSTRAINT zipchk;
.fi
.if n \{\
.RE
.\}
.PP
To rename a check constraint on a domain:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DOMAIN zipcode RENAME CONSTRAINT zipchk TO zip_check;
.fi
.if n \{\
.RE
.\}
.PP
To move the domain into a different schema:
.sp
.if n \{\
.RS 4
.\}
.nf
ALTER DOMAIN zipcode SET SCHEMA customers;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
\fBALTER DOMAIN\fR
conforms to the
SQL
standard, except for the
OWNER,
RENAME,
SET SCHEMA, and
VALIDATE CONSTRAINT
variants, which are
PostgreSQL
extensions\&. The
NOT VALID
clause of the
ADD CONSTRAINT
variant is also a
PostgreSQL
extension\&.
.SH "SEE ALSO"
CREATE DOMAIN (\fBCREATE_DOMAIN\fR(7)), DROP DOMAIN (\fBDROP_DOMAIN\fR(7))
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