AI_SUMMARIZE (Transact-SQL)

Applies to: SQL analytics endpoint in Microsoft Fabric and Warehouse in Microsoft Fabric

AI_SUMMARIZE creates a concise summary of the input text.

Note

AI_SUMMARIZE is in preview.
AI_SUMMARIZE is available only in SQL analytics endpoint and Warehouse in Microsoft Fabric.

Syntax

AI_SUMMARIZE ( text [ (NULL | ERROR | DEFAULT <value>) ON ERROR ] )

An expression of a character type, for example nvarchar, varchar, nchar, or char.

The ON ERROR clause controls how an AI function handles processing errors.

NULL ON ERROR returns NULL when the function can't process a value. This is the default behavior and doesn't need to be explicitly specified.
ERROR ON ERROR causes the entire query to fail if an error occurs while processing any input value.
DEFAULT <value> ON ERROR returns the specified default value instead of NULL when an error occurs.

Errors can be caused by Responsible AI safety checks, input size limits, transient service issues, or other processing failures.

Returns nvarchar containing the generated summary.

AI functions return NULL if the AI model can't process the text. Common reasons include:

Responsible AI rules block inappropriate content in the input text.
Input text exceeds token limits. The current model supports up to 15 KB of text.

SELECT ai_summarize('The hotel was clean and staff were friendly.') AS summary;

Expected result: Clean hotel, friendly staff.

The following query sends every review_text value to external AI service to summarize it.

SELECT review_id,
       ai_summarize(review_text DEFAULT 'N/A' ON ERROR) AS review_summary
FROM dbo.hotel_reviews;

The optional DEFAULT 'N/A' ON ERROR clause instructs AI function to return the value 'N/A' for every input value that cannot be processed.

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