---
title: "Language Elements (Transact-SQL)"
description: "Language Elements (Transact-SQL)"
author: rwestMSFT
ms.author: randolphwest
ms.reviewer: ""
ms.date: "06/10/2016"
ms.prod: sql
ms.prod_service: "database-engine, sql-database, synapse-analytics, pdw"
ms.technology: t-sql
ms.topic: reference
ms.custom: ""
dev_langs:
  - "TSQL"
monikerRange: ">= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || >= sql-server-linux-2017 || = azuresqldb-mi-current"
---
# Language Elements (Transact-SQL)
[!INCLUDE [sql-asdb-asdbmi-asa-pdw](../../includes/applies-to-version/sql-asdb-asdbmi-asa-pdw.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 (Azure Synapse Analytics)](../../t-sql/language-elements/transactions-sql-data-warehouse.md)
  
[USE (Transact-SQL)](../../t-sql/language-elements/use-transact-sql.md)