In Azure Stream Analytics, queries are defined using a SQL-like query language specifically designed for real- time analytics over streaming data.
The language is often referred to as Stream Analytics Query Language (SAQL).
It is very similar to T-SQL (Transact-SQL) but extended with additional features for temporal (time-based) operations, stream joins, aggregations over windows, and event handling.
With this language, you can perform operations like filtering, projections, aggregations, joins, and even machine learning model scoring on data streams.
Reviewing the options:
SQL - Correct. Azure Stream Analytics jobs are defined using a SQL-like language.
XML - Incorrect. XML is used for data representation, not defining queries in Stream Analytics.
YAML - Incorrect. YAML is commonly used for configuration files, not streaming queries.
KOL - Incorrect. This is not a relevant query language.
The answer: A. SQL
Microsoft References
Introduction to Azure Stream Analytics query language
Query overview for Stream Analytics