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Chapter 34. The Information Schema
Name
Data Type
Description
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 (always the
current database)
table_schema
sql_identifier
Name of the schema that
contains the table
table_name
sql_identifier
Name of the table
privilege_type
character_data
Type of the privilege:
SELECT
,
INSERT
,
UPDATE
,
DELETE
,
TRUNCATE
,
REFERENCES
,or
TRIGGER
is_grantable
yes_or_no
YES
if the privilege is grantable,
NO
if not
with_hierarchy
yes_or_no
In the SQL standard,
WITH
HIERARCHY OPTION
is a
separate (sub-)privilege
allowing certain operations on
table inheritance hierarchies. In
PostgreSQL, this is included in
the
SELECT
privilege, sothis
column shows
YES
if the
privilege is
SELECT
,else
NO
.
34.37.
role_udt_grants
The view
role_udt_grants
is intended to identify
USAGE
privileges granted on user-defined types
where the grantor or grantee is a currently enabled role. Further information can be found under
udt_privileges
.Theonlyeffective difference between this viewand
udt_privileges
is thatthis
view omits objects that have been made accessible to the current user by way of a grant to
PUBLIC
.
Since data types do not have real privileges inPostgreSQL, but onlyan implicitgrant to
PUBLIC
,this
view is empty.
Table 34-35.
role_udt_grants
Columns
Name
Data Type
Description
grantor
sql_identifier
The name of the role that
granted the privilege
grantee
sql_identifier
The name of the role that the
privilege was granted to
udt_catalog
sql_identifier
Name of the database
containing the type (always the
current database)
udt_schema
sql_identifier
Name of the schema containing
the type
udt_name
sql_identifier
Name of the type
878
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Chapter 34. The Information Schema
Name
Data Type
Description
privilege_type
character_data
Always
TYPE USAGE
is_grantable
yes_or_no
YES
if the privilege is grantable,
NO
if not
34.38.
role_usage_grants
The view
role_usage_grants
identifies
USAGE
privileges granted on various kinds of objects
where the grantor or grantee is a currently enabled role. Further information can be found under
usage_privileges
.The only effective difference between this view and
usage_privileges
is
that this view omits objects that have been made accessible to the current user by way of a grant to
PUBLIC
.
Table 34-36.
role_usage_grants
Columns
Name
Data Type
Description
grantor
sql_identifier
The name of the role that
granted the privilege
grantee
sql_identifier
The name of the role that the
privilege was granted to
object_catalog
sql_identifier
Name of the database
containing the object (always
the current database)
object_schema
sql_identifier
Name of the schema containing
the object, if applicable, else an
empty string
object_name
sql_identifier
Name of the object
object_type
character_data
COLLATION
or
DOMAIN
or
FOREIGN DATA WRAPPER
or
FOREIGN SERVER
or
SEQUENCE
privilege_type
character_data
Always
USAGE
is_grantable
yes_or_no
YES
if the privilege is grantable,
NO
if not
34.39.
routine_privileges
The view
routine_privileges
identifies all privileges granted on functions to a currently enabled
role or by a currently enabled role. There is one row for each combination of function, grantor, and
grantee.
Table 34-37.
routine_privileges
Columns
Name
Data Type
Description
879
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Chapter 34. The Information Schema
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
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.
routine_catalog
sql_identifier
Name of the database
containing the function (always
the current database)
routine_schema
sql_identifier
Name of the schema containing
the function
routine_name
sql_identifier
Name of the function (might be
duplicated in case of
overloading)
privilege_type
character_data
Always
EXECUTE
(the only
privilege type for functions)
is_grantable
yes_or_no
YES
if the privilege is grantable,
NO
if not
34.40.
routines
The view
routines
contains all functions in the current database. Only those functions are shown
that the current user has access to (by way of being the owner or having some privilege).
Table 34-38.
routines
Columns
Name
Data Type
Description
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
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Chapter 34. The Information Schema
Name
Data Type
Description
specific_name
sql_identifier
The “specific name” of the
function. This is a name that
uniquely identifies the function
in the schema, even if the real
name of the function is
overloaded. The format of the
specific name is not defined, it
should only be used to compare
it toother instances of specific
routine names.
routine_catalog
sql_identifier
Name of the database
containing the function (always
the current database)
routine_schema
sql_identifier
Name of the schema containing
the function
routine_name
sql_identifier
Name of the function (might be
duplicated in case of
overloading)
routine_type
character_data
Always
FUNCTION
(In the
future there might be other
types of routines.)
module_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
module_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
module_name
sql_identifier
Applies to a feature not
available in PostgreSQL
udt_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
udt_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
udt_name
sql_identifier
Applies to a feature not
available in PostgreSQL
data_type
character_data
Return data type of the
function, if it is a built-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
type_udt_name
and
associated columns).
character_maximum_length
cardinal_number
Always null, since this
information is not applied to
return data types in PostgreSQL
881
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Chapter 34. The Information Schema
Name
Data Type
Description
character_octet_length
cardinal_number
Always null, since this
information is not applied to
return data types in PostgreSQL
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
Always null, since this
information is not applied to
return data types in PostgreSQL
collation_schema
sql_identifier
Always null, since this
information is not applied to
return data types in PostgreSQL
collation_name
sql_identifier
Always null, since this
information is not applied to
return data types in PostgreSQL
numeric_precision
cardinal_number
Always null, since this
information is not applied to
return data types in PostgreSQL
numeric_precision_radix
cardinal_number
Always null, since this
information is not applied to
return data types in PostgreSQL
numeric_scale
cardinal_number
Always null, since this
information is not applied to
return data types in PostgreSQL
datetime_precision
cardinal_number
Always null, since this
information is not applied to
return data types in PostgreSQL
interval_type
character_data
Always null, since this
information is not applied to
return data types in PostgreSQL
interval_precision
cardinal_number
Always null, since this
information is not applied to
return data types in PostgreSQL
882
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Chapter 34. The Information Schema
Name
Data Type
Description
type_udt_catalog
sql_identifier
Name of the database that the
return data type of the function
is defined in (always the current
database)
type_udt_schema
sql_identifier
Name of the schema that the
return data type of the function
is defined in
type_udt_name
sql_identifier
Name of the return data type of
the function
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 return data
type of this function, unique
among the data type descriptors
pertaining to the function. 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.)
routine_body
character_data
If the function is an SQL
function, then
SQL
,else
EXTERNAL
.
routine_definition
character_data
The source text of the function
(null if the function is not
owned by a currently enabled
role). (According to the SQL
standard, this column is only
applicable if
routine_body
is
SQL
,but in PostgreSQL it will
contain whatever source text
was specifiedwhen the function
was created.)
883
Chapter 34. The Information Schema
Name
Data Type
Description
external_name
character_data
If this function is a C function,
then the external name (link
symbol) of the function; else
null. (This works out to be the
same value that is shown in
routine_definition
.)
external_language
character_data
The language the function is
written in
parameter_style
character_data
Always
GENERAL
(The SQL
standard defines other
parameter styles, which are not
available in PostgreSQL.)
is_deterministic
yes_or_no
If the function is declared
immutable (called deterministic
in the SQL standard), then
YES
,
else
NO
.(You cannot query the
other volatility levels available
in PostgreSQL through the
information schema.)
sql_data_access
character_data
Always
MODIFIES
,meaning
that the function possibly
modifies SQL data. This
information is not useful for
PostgreSQL.
is_null_call
yes_or_no
If the function automatically
returns null if any of its
arguments are null, then
YES
,
else
NO
.
sql_path
character_data
Applies to a feature not
available in PostgreSQL
schema_level_routine
yes_or_no
Always
YES
(The opposite
would be a method of a
user-defined type, which is a
feature not available in
PostgreSQL.)
max_dynamic_result_sets
cardinal_number
Applies to a feature not
available in PostgreSQL
is_user_defined_cast
yes_or_no
Applies to a feature not
available in PostgreSQL
is_implicitly_invocable
yes_or_no
Applies to a feature not
available in PostgreSQL
security_type
character_data
If the function runs with the
privileges of the current user,
then
INVOKER
,if the function
runs with the privileges of the
user who defined it, then
DEFINER
.
884
Chapter 34. The Information Schema
Name
Data Type
Description
to_sql_specific_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
to_sql_specific_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
to_sql_specific_name
sql_identifier
Applies to a feature not
available in PostgreSQL
as_locator
yes_or_no
Applies to a feature not
available in PostgreSQL
created
time_stamp
Applies to a feature not
available in PostgreSQL
last_altered
time_stamp
Applies to a feature not
available in PostgreSQL
new_savepoint_level
yes_or_no
Applies to a feature not
available in PostgreSQL
is_udt_dependent
yes_or_no
Currently always
NO
.The
alternative
YES
applies to a
feature not available in
PostgreSQL.
result_cast_from_data_type
character_data
Applies to a feature not
available in PostgreSQL
result_cast_as_locator
yes_or_no
Applies to a feature not
available in PostgreSQL
result_cast_char_max_length
cardinal_number
Applies to a feature not
available in PostgreSQL
result_cast_char_octet_length
character_data
Applies to a feature not
available in PostgreSQL
result_cast_char_set_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_char_set_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_char_set_name
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_collation_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_collation_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_collation_name
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_numeric_precision
cardinal_number
Applies to a feature not
available in PostgreSQL
result_cast_numeric_precision_radix
cardinal_number
Applies to a feature not
available in PostgreSQL
result_cast_numeric_scale
cardinal_number
Applies to a feature not
available in PostgreSQL
result_cast_datetime_precision
character_data
Applies to a feature not
available in PostgreSQL
885
Chapter 34. The Information Schema
Name
Data Type
Description
result_cast_interval_type
character_data
Applies to a feature not
available in PostgreSQL
result_cast_interval_precision
cardinal_number
Applies to a feature not
available in PostgreSQL
result_cast_type_udt_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_type_udt_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_type_udt_name
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_scope_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_scope_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_scope_name
sql_identifier
Applies to a feature not
available in PostgreSQL
result_cast_maximum_cardinality
cardinal_number
Applies to a feature not
available in PostgreSQL
result_cast_dtd_identifier
sql_identifier
Applies to a feature not
available in PostgreSQL
34.41.
schemata
The view
schemata
contains all schemas in the current database that the current user has access to
(by way of being the owner or having some privilege).
Table 34-39.
schemata
Columns
Name
Data Type
Description
catalog_name
sql_identifier
Name of the database that the
schema is contained in (always
the current database)
schema_name
sql_identifier
Name of the schema
schema_owner
sql_identifier
Name of the owner of the
schema
default_character_set_catalog
sql_identifier
Applies to a feature not
available in PostgreSQL
default_character_set_schema
sql_identifier
Applies to a feature not
available in PostgreSQL
default_character_set_name
sql_identifier
Applies to a feature not
available in PostgreSQL
sql_path
character_data
Applies to a feature not
available in PostgreSQL
886
Chapter 34. The Information Schema
34.42.
sequences
The view
sequences
contains all sequences defined in the current database. Only those sequences
are shown that the current user has access to (by way of being the owner or having some privilege).
Table 34-40.
sequences
Columns
Name
Data Type
Description
sequence_catalog
sql_identifier
Name of the database that
contains the sequence (always
the current database)
sequence_schema
sql_identifier
Name of the schema that
contains the sequence
sequence_name
sql_identifier
Name of the sequence
data_type
character_data
The data type of the sequence.
InPostgreSQL, this is currently
always
bigint
.
numeric_precision
cardinal_number
This column contains the
(declared or implicit) precision
of the sequence data type (see
above). The precisionindicates
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
.
numeric_precision_radix
cardinal_number
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.
numeric_scale
cardinal_number
This column contains the
(declared or implicit) scale of
the sequence data type (see
above). 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
.
start_value
character_data
The start value of the sequence
minimum_value
character_data
The minimum value of the
sequence
887
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