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sys.extended_properties (Transact-SQL)

Returns a row for each extended property in the current database.

Applies to: SQL Server (SQL Server 2008 through current version).

Column name

Data type

Description

class

tinyint

Identifies the class of item on which the property exists. Can be one of the following:

0 = Database

1 = Object or column

2 = Parameter

3 = Schema

4 = Database principal

5 = Assembly

6 = Type

7 = Index

10 = XML schema collection

15 = Message type

16 = Service contract

17 = Service

18 = Remote service binding

19 = Route

20 = Dataspace (filegroup or partition scheme)

21 = Partition function

22 = Database file

27 = Plan guide

class_desc

nvarchar(60)

Description of the class on which the extended property exists. Can be one of the following:

DATABASE

OBJECT_OR_COLUMN

PARAMETER

SCHEMA

DATABASE_PRINCIPAL

ASSEMBLY

TYPE

INDEX

XML_SCHEMA_COLLECTION

MESSAGE_TYPE

SERVICE_CONTRACT

SERVICE

REMOTE_SERVICE_BINDING

ROUTE

DATASPACE

PARTITION_FUNCTION

DATABASE_FILE

PLAN_GUIDE

major_id

int

ID of the item on which the extended property exists, interpreted according to its class. For most items, this is the ID that applies to what the class represents. Interpretation for nonstandard major IDs is as follows:

If class is 0, major_id is always 0.

If class is 1, 2, or 7 major_id is object_id.

minor_id

int

Secondary ID of the item on which the extended property exists, interpreted according to its class. For most items this is 0; otherwise, the ID is as follows:

If class = 1, minor_id is the column_id if column, else 0 if object.

If class = 2, minor_id is the parameter_id.

If class 7 = minor_id is the index_id.

name

sysname

Property name, unique with class, major_id, and minor_id.

value

sql_variant

Value of the extended property.

The visibility of the metadata in catalog views is limited to securables that a user either owns or on which the user has been granted some permission. For more information, see Metadata Visibility Configuration.

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