OBJECT_SCHEMA_NAME (Transact-SQL)

आलेख
09/03/2024

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics

Returns the database schema name for schema-scoped objects. For a list of schema-scoped objects, see sys.objects (Transact-SQL).

Note

The function OBJECT_SCHEMA_NAME is only supported in dedicated SQL pools in Azure Synapse Analytics.

Transact-SQL syntax conventions

Syntax

OBJECT_SCHEMA_NAME ( object_id [, database_id ] )

Arguments

object_id

The ID of the object to be used. object_id is int and is assumed to be a schema-scoped object in the specified database, or in the current database context.

database_id

The ID of the database where the object is to be looked up. database_id is int.

Return Types

sysname

Exceptions

Returns NULL on error or if a caller does not have permission to view the object. If the target database has the AUTO_CLOSE option set to ON, the function opens the database.

A user can only view the metadata of securables that the user owns or on which the user has been granted permission. Metadata-emitting, built-in functions such as OBJECT_SCHEMA_NAME may return NULL if the user doesn't have any permission on the object. For more information, see Metadata Visibility Configuration.

Permissions

Requires ANY permission on the object. To specify a database ID, CONNECT permission to the database is also required, or the guest account must be enabled.

Remarks

System functions can be used in the select list, in the WHERE clause, and anywhere an expression is allowed. For more information, see Expressions and WHERE.

The result set returned by this system function uses the collation of the current database.

If database_id is not specified, the SQL Server Database Engine assumes that object_id is in the context of the current database. A query that references an object_id in another database returns NULL or incorrect results. For example, in the following query, the context of the current database is AdventureWorks2022. The Database Engine tries to return an object schema name for the specified object_id in current database instead of the database specified in the FROM clause of the query. Therefore, incorrect information is returned.

SELECT DISTINCT OBJECT_SCHEMA_NAME(object_id)  
FROM master.sys.objects;

The following example specifies the database ID for the master database in the OBJECT_SCHEMA_NAME function and returns the correct results.

SELECT DISTINCT OBJECT_SCHEMA_NAME(object_id, 1) AS schema_name  
FROM master.sys.objects;

Examples

A. Return the object schema name and object name

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance

The following example returns the object schema name, object name, and SQL text for all cached query plans that are not ad hoc or prepared statements.

SELECT DB_NAME(st.dbid) AS database_name,   
    OBJECT_SCHEMA_NAME(st.objectid, st.dbid) AS schema_name,  
    OBJECT_NAME(st.objectid, st.dbid) AS object_name,   
    st.text AS query_statement  
FROM sys.dm_exec_query_stats AS qs  
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st  
WHERE st.objectid IS NOT NULL;  
GO

B. Return three-part object names

The following example returns the database, schema, and object name for all objects in the current database context.

SELECT QUOTENAME(DB_NAME(db_id()))   
    + N'.'   
    + QUOTENAME(OBJECT_SCHEMA_NAME(object_id, db_id()))   
    + N'.'   
    + QUOTENAME(OBJECT_NAME(object_id, db_id()))  
    , *   
FROM sys.objects;
GO

The following example returns the database, schema, and object name along with all other columns in the sys.dm_db_index_operational_stats dynamic management view for all objects in all databases.