---
title: "Language Elements (Transact-SQL) | Microsoft Docs"
ms.custom: ""
ms.date: "06/10/2016"
ms.prod: sql
ms.prod_service: "database-engine, sql-database, sql-data-warehouse, pdw"
ms.reviewer: ""
ms.technology: t-sql
ms.topic: "language-reference"
dev_langs: 
  - "TSQL"
ms.assetid: e9b8daff-b72f-4a53-907d-5a83a78785ec
author: rothja
ms.author: jroth
monikerRange: ">=aps-pdw-2016||=azuresqldb-current||=azure-sqldw-latest||>=sql-server-2016||=sqlallproducts-allversions||>=sql-server-linux-2017||=azuresqldb-mi-current"
---
# Language Elements (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-all-md](../../includes/tsql-appliesto-ss2008-all-md.md)]

 [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] supports the following language elements.  
  
## In This Section  
[-- (Comment) (Transact-SQL)](../../t-sql/language-elements/comment-transact-sql.md)  
  
[Slash Star (Block Comment) (Transact-SQL)](../../t-sql/language-elements/slash-star-comment-transact-sql.md)  
 
[CREATE DIAGNOSTICS SESSION (Transact-SQL)](../../t-sql/language-elements/create-diagnostics-session-transact-sql.md)  

[NULL and UNKNOWN (Transact-SQL)](../../t-sql/language-elements/null-and-unknown-transact-sql.md)

[Transactions (SQL Data Warehouse)](../../t-sql/language-elements/transactions-sql-data-warehouse.md)
  
[USE (Transact-SQL)](../../t-sql/language-elements/use-transact-sql.md)