Language Elements (Transact-SQL)

**APPLIES TO:** SQL Server (starting with 2008) Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse

SQL Server supports the following language elements.

In This Section

– (Comment) (Transact-SQL)

Slash Star (Block Comment) (Transact-SQL)

CREATE DIAGNOSTICS SESSION (Transact-SQL)

NULL and UNKNOWN (Transact-SQL)

Transactions (SQL Data Warehouse)

USE (Transact-SQL)