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Chapter 34. The Information Schema
Name
Data Type
Description
interval_type
character_data
If
data_type
identifies an
interval type, this column
contains the specification which
fields the intervals include for
this attribute, e.g.,
YEAR TO
MONTH
,
DAY TO SECOND
,etc.
If no field restrictions were
specified (that is, the interval
accepts all fields), andfor all
other data types, this field is
null.
interval_precision
cardinal_number
Applies to a feature not
available in PostgreSQL (see
datetime_precision
for the
fractional seconds precision of
interval type attributes)
attribute_udt_catalog
sql_identifier
Name of the database that the
attribute data type is defined in
(always the current database)
attribute_udt_schema
sql_identifier
Name of the schema that the
attribute data type is defined in
attribute_udt_name
sql_identifier
Name of the attribute data type
scope_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
scope_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
scope_name
sql_identifier
Applies to a feature not
available in PostgreSQL
maximum_cardinality
cardinal_number
Always null, because arrays
always have unlimited
maximum cardinality in
PostgreSQL
dtd_identifier
sql_identifier
An identifier of the data type
descriptor of the column,
unique among the data type
descriptors pertaining to the
table. This is mainly useful for
joining with other instances of
such identifiers. (The specific
format of the identifier is not
defined and not guaranteed to
remain the same in future
versions.)
is_derived_reference_attribute
yes_or_no
Applies to a feature not
available in PostgreSQL
See also under Section 34.16, a similarly structured view, for further information on some of the
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Chapter 34. The Information Schema
columns.
34.7.
character_sets
The view
character_sets
identifies the character sets availablein the currentdatabase. Since Post-
greSQL does notsupport multiple character sets withinonedatabase, this viewonly shows one, which
is the database encoding.
Take note of how the following terms are used in the SQL standard:
character repertoire
An abstract collection of characters, for example
UNICODE
,
UCS
,or
LATIN1
.Not exposed as an
SQL object, but visible in this view.
character encoding form
An encoding of some character repertoire. Most older character repertoires only use one en-
coding form, and so there are no separate names for them (e.g.,
LATIN1
is an encoding form
applicable to the
LATIN1
repertoire). But for example Unicode has the encoding forms
UTF8
,
UTF16
,etc. (not all supported by PostgreSQL). Encoding forms are not exposed as an SQL
object, but are visible in this view.
character set
Anamed SQL object that identifies a character repertoire, a character encoding, and a default
collation. A predefined character set would typically have the same name as an encoding form,
but users could define other names. For example, the character set
UTF8
would typically identify
the character repertoire
UCS
,encoding form
UTF8
,and some default collation.
You can think of an “encoding” in PostgreSQL either as a character set or a character encoding form.
They will have the same name, and there canonly be one in one database.
Table 34-5.
character_sets
Columns
Name
Data Type
Description
character_set_catalog
sql_identifier
Character sets are currently not
implemented as schema
objects, so this column is null.
character_set_schema
sql_identifier
Character sets are currently not
implemented as schema
objects, so this column is null.
character_set_name
sql_identifier
Name of the character set,
currently implemented as
showing the name of the
database encoding
character_repertoire
sql_identifier
Character repertoire, showing
UCS
if the encoding is
UTF8
,
else just the encoding name
form_of_use
sql_identifier
Character encoding form, same
as the database encoding
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Chapter 34. The Information Schema
Name
Data Type
Description
default_collate_catalog
sql_identifier
Name of the database
containing the default collation
(always the current database, if
any collation is identified)
default_collate_schema
sql_identifier
Name of the schema containing
the default collation
default_collate_name
sql_identifier
Name of the default collation.
The default collation is
identified as the collation that
matches the
COLLATE
and
CTYPE
settings of the current
database. If there is no such
collation, then this column and
the associated schema and
catalog columns are null.
34.8.
check_constraint_routine_usage
The view
check_constraint_routine_usage
identifies routines (functions and procedures) that
are used by a check constraint. Only those routines are shown that are owned by a currently enabled
role.
Table 34-6.
check_constraint_routine_usage
Columns
Name
Data Type
Description
constraint_catalog
sql_identifier
Name of the database
containing the constraint
(always the current database)
constraint_schema
sql_identifier
Name of the schema containing
the constraint
constraint_name
sql_identifier
Name of the constraint
specific_catalog
sql_identifier
Name of the database
containing the function (always
the current database)
specific_schema
sql_identifier
Name of the schema containing
the function
specific_name
sql_identifier
The “specific name” of the
function. See Section 34.40 for
more information.
34.9.
check_constraints
The view
check_constraints
contains all check constraints, either defined on a table or on a
domain, that are owned by a currently enabled role. (The owner of the table or domain is the owner
of the constraint.)
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Chapter 34. The Information Schema
Table 34-7.
check_constraints
Columns
Name
Data Type
Description
constraint_catalog
sql_identifier
Name of the database
containing the constraint
(always the current database)
constraint_schema
sql_identifier
Name of the schema containing
the constraint
constraint_name
sql_identifier
Name of the constraint
check_clause
character_data
The check expression of the
check constraint
34.10.
collations
The view
collations
contains the collations available in the current database.
Table 34-8.
collations
Columns
Name
Data Type
Description
collation_catalog
sql_identifier
Name of the database
containing the collation (always
the current database)
collation_schema
sql_identifier
Name of the schema containing
the collation
collation_name
sql_identifier
Name of the default collation
pad_attribute
character_data
Always
NO PAD
(The
alternative
PAD SPACE
is not
supported by PostgreSQL.)
34.11.
collation_character_set_applicability
The view
collation_character_set_applicability
identifies which character set the avail-
able collations are applicable to. In PostgreSQL, there is only one character set per database (see
explanation in Section 34.7), so this view does not provide much useful information.
Table 34-9.
collation_character_set_applicability
Columns
Name
Data Type
Description
collation_catalog
sql_identifier
Name of the database
containing the collation (always
the current database)
collation_schema
sql_identifier
Name of the schema containing
the collation
collation_name
sql_identifier
Name of the default collation
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Chapter 34. The Information Schema
Name
Data Type
Description
character_set_catalog
sql_identifier
Character sets are currently not
implemented as schema
objects, so this column is null
character_set_schema
sql_identifier
Character sets are currently not
implemented as schema
objects, so this column is null
character_set_name
sql_identifier
Name of the character set
34.12.
column_domain_usage
The view
column_domain_usage
identifies allcolumns (of a tableor a view) that makeuse of some
domain defined in the current database and owned by a currently enabled role.
Table 34-10.
column_domain_usage
Columns
Name
Data Type
Description
domain_catalog
sql_identifier
Name of the database
containing the domain (always
the current database)
domain_schema
sql_identifier
Name of the schema containing
the domain
domain_name
sql_identifier
Name of the domain
table_catalog
sql_identifier
Name of the database
containing the table (always the
current database)
table_schema
sql_identifier
Name of the schema containing
the table
table_name
sql_identifier
Name of the table
column_name
sql_identifier
Name of the column
34.13.
column_options
The view
column_options
contains all the options defined for foreign table columns in the current
database. Only those foreign table columns are shown that the current user has access to (by way of
being the owner or having some privilege).
Table 34-11.
column_options
Columns
Name
Data Type
Description
table_catalog
sql_identifier
Name of the database that
contains the foreign table
(always the current database)
table_schema
sql_identifier
Name of the schema that
contains the foreign table
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Chapter 34. The Information Schema
Name
Data Type
Description
table_name
sql_identifier
Name of the foreign table
column_name
sql_identifier
Name of the column
option_name
sql_identifier
Name of an option
option_value
character_data
Value of the option
34.14.
column_privileges
The view
column_privileges
identifies all privileges granted on columns to a currently enabled
role or by a currently enabled role. There is one row for each combination of column, grantor, and
grantee.
If a privilege has been granted on an entire table, it will show up in this view as a grant for each
column, but only for the privilege types where column granularity is possible:
SELECT
,
INSERT
,
UPDATE
,
REFERENCES
.
Table 34-12.
column_privileges
Columns
Name
Data Type
Description
grantor
sql_identifier
Name of the role that granted
the privilege
grantee
sql_identifier
Name of the role that the
privilege was granted to
table_catalog
sql_identifier
Name of the database that
contains the table that contains
the column (always the current
database)
table_schema
sql_identifier
Name of the schema that
contains the table that contains
the column
table_name
sql_identifier
Name of the table that contains
the column
column_name
sql_identifier
Name of the column
privilege_type
character_data
Type of the privilege:
SELECT
,
INSERT
,
UPDATE
,or
REFERENCES
is_grantable
yes_or_no
YES
if the privilege is grantable,
NO
if not
34.15.
column_udt_usage
The view
column_udt_usage
identifiesallcolumns thatuse data types ownedby acurrentlyenabled
role. Note that in PostgreSQL, built-in data types behave like user-definedtypes, so they are included
here as well. See also Section 34.16 for details.
853
Chapter 34. The Information Schema
Table 34-13.
column_udt_usage
Columns
Name
Data Type
Description
udt_catalog
sql_identifier
Name of the database that the
column data type (the
underlying type of the domain,
if applicable) is definedin
(always the current database)
udt_schema
sql_identifier
Name of the schema that the
column data type (the
underlying type of the domain,
if applicable) is definedin
udt_name
sql_identifier
Name of the column data type
(the underlying type of the
domain, if applicable)
table_catalog
sql_identifier
Name of the database
containing the table (always the
current database)
table_schema
sql_identifier
Name of the schema containing
the table
table_name
sql_identifier
Name of the table
column_name
sql_identifier
Name of the column
34.16.
columns
The view
columns
contains information about all table columns (or view columns) in the database.
System columns (
oid
,etc.) are not included. Only those columns are shown that the current user has
access to (by way of being the owner or having some privilege).
Table 34-14.
columns
Columns
Name
Data Type
Description
table_catalog
sql_identifier
Name of the database
containing the table (always the
current database)
table_schema
sql_identifier
Name of the schema containing
the table
table_name
sql_identifier
Name of the table
column_name
sql_identifier
Name of the column
ordinal_position
cardinal_number
Ordinal position of the column
within the table (count starts at
1)
column_default
character_data
Default expression of the
column
854
Chapter 34. The Information Schema
Name
Data Type
Description
is_nullable
yes_or_no
YES
if the column is possibly
nullable,
NO
if it is known not
nullable. Anot-null constraint
is one way a column can be
known not nullable, but there
can be others.
data_type
character_data
Data type of the column, if it is
abuilt-in type, or
ARRAY
if it is
some array (in that case, see the
view
element_types
), else
USER-DEFINED
(in that case,
the type is identified in
udt_name
and associated
columns). If the column is
based on a domain, this column
refers to the type underlying the
domain (and the domain is
identified in
domain_name
and
associated columns).
character_maximum_length
cardinal_number
If
data_type
identifies a
character or bit string type, the
declared maximum length; null
for all other data types or if no
maximum length was declared.
character_octet_length
cardinal_number
If
data_type
identifies a
character type, the maximum
possible length in octets (bytes)
of a datum; null for all other
data types. The maximum octet
length depends on the declared
character maximum length (see
above) and the server encoding.
numeric_precision
cardinal_number
If
data_type
identifies a
numeric type, this column
contains the (declared or
implicit) precision of the type
for this column. The precision
indicates the number of
significant digits. It can be
expressed in decimal (base 10)
or binary (base 2) terms, as
specified in the column
numeric_precision_radix
.
For all other data types, this
column is null.
855
Chapter 34. The Information Schema
Name
Data Type
Description
numeric_precision_radix
cardinal_number
If
data_type
identifies a
numeric type, this column
indicates in which base the
values in the columns
numeric_precision
and
numeric_scale
are
expressed. The value is either 2
or 10. For all other data types,
this column is null.
numeric_scale
cardinal_number
If
data_type
identifies an
exact numeric type, this column
contains the (declared or
implicit) scale of the type for
this column. The scale indicates
the number of significant digits
to the right of the decimal
point. It can be expressed in
decimal (base 10) or binary
(base 2) terms, as specified in
the column
numeric_precision_radix
.
For all other data types, this
column is null.
datetime_precision
cardinal_number
If
data_type
identifies a date,
time, timestamp, or interval
type, this column contains the
(declared or implicit) fractional
seconds precision of the type
for this column, that is, the
number of decimal digits
maintained following the
decimal point in the seconds
value. For all other data types,
this column is null.
interval_type
character_data
If
data_type
identifies an
interval type, this column
contains the specification which
fields the intervals include for
this column, e.g.,
YEAR TO
MONTH
,
DAY TO SECOND
,etc.
If no field restrictions were
specified (that is, the interval
accepts all fields), andfor all
other data types, this field is
null.
856
Chapter 34. The Information Schema
Name
Data Type
Description
interval_precision
cardinal_number
Applies to a feature not
available in PostgreSQL (see
datetime_precision
for the
fractional seconds precision of
interval type columns)
character_set_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
character_set_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
character_set_name
sql_identifier
Applies to a feature not
available in PostgreSQL
collation_catalog
sql_identifier
Name of the database
containing the collation of the
column (always the current
database), null if default or the
data type of the column is not
collatable
collation_schema
sql_identifier
Name of the schema containing
the collationof the column, null
if default or the data type of the
column is not collatable
collation_name
sql_identifier
Name of the collation of the
column, null if default or the
data type of the column is not
collatable
domain_catalog
sql_identifier
If the column has a domain
type, the name of the database
that the domain is defined in
(always the current database),
else null.
domain_schema
sql_identifier
If the column has a domain
type, the name of the schema
that the domain is defined in,
else null.
domain_name
sql_identifier
If the column has a domain
type, the name of the domain,
else null.
udt_catalog
sql_identifier
Name of the database that the
column data type (the
underlying type of the domain,
if applicable) is definedin
(always the current database)
udt_schema
sql_identifier
Name of the schema that the
column data type (the
underlying type of the domain,
if applicable) is definedin
857
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