title: "SCHEMA_ID (Transact-SQL) | Microsoft Docs" ms.custom: "" ms.date: "03/03/2017" ms.prod: "sql" ms.prod_service: "database-engine, sql-database, sql-data-warehouse, pdw" ms.service: "" ms.component: "t-sql|functions" ms.reviewer: "" ms.suite: "sql" ms.technology:
- "database-engine" ms.tgt_pltfrm: "" ms.topic: "language-reference" f1_keywords:
- "SCHEMA_ID"
- "SCHEMA_ID_TSQL" dev_langs:
- "TSQL" helpviewer_keywords:
- "identification numbers [SQL Server], schemas"
- "schemas [SQL Server], IDs"
- "SCHEMA_ID function"
- "IDs [SQL Server], schemas"
- "default schema IDs" ms.assetid: c8e34df5-3eea-459f-ae40-050909ce9fda caps.latest.revision: 39 author: "edmacauley" ms.author: "edmaca" manager: "craigg" ms.workload: "On Demand" monikerRange: ">= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || = sqlallproducts-allversions"
[!INCLUDEtsql-appliesto-ss2008-all-md]
Returns the schema ID associated with a schema name.
Transact-SQL Syntax Conventions
SCHEMA_ID ( [ schema_name ] )
| Term | Definition |
|---|---|
| schema_name | Is the name of the schema. schema_name is a sysname. If schema_name is not specified, SCHEMA_ID will return the ID of the default schema of the caller. |
int
NULL will be returned if schema_name is not a valid schema.
SCHEMA_ID will return IDs of system schemas and user-defined schemas. SCHEMA_ID can be called in a select list, in a WHERE clause, and anywhere an expression is allowed.
SELECT SCHEMA_ID();
SELECT SCHEMA_ID('dbo');
Metadata Functions (Transact-SQL)
SCHEMA_NAME (Transact-SQL)
sys.schemas (Transact-SQL)