STRING_AGG is not a recognized built-in function name

问题

I've downloaded and installed SQL Server 2016. When I attempted to use the STRING_AGG function I receive this error. Here is my code:

SELECT STRING_AGG(cast(FieldNumber AS VARCHAR(100)), ',')
FROM Fields

I've installed SQL Server 2016 and SP1. Is there anything else I need to do. Here is the feature I am trying to use. String Agg

回答1:

STRING_AGG is not introduced in SQL SERVER 2016.

It is introduced in SQL SERVER vNext. In the MSDN link you have provided it is mentioned THIS TOPIC APPLIES TO : SQL Server (starting with vNext) not SQL SERVER 2016. It is a much needed feature I wish they add it in any future releases

In case you are wondering what is vNext

SQL Server vNext represents a major step towards making SQL Server a platform that enables choices of development languages, data types, on-premises and in the cloud, and across operating systems by bringing the power of SQL Server to Linux, Linux-based Docker containers, and Windows. SQL Server vNext also includes the features added in SQL Server 2016 service packs

For more info check here

回答2:

You might have multiple SQL server instances installed for various SQL versions. Go to the Services and start the service for newly installed SQL server version instance.

Then connect that instance with your SQL server management studio.

来源：https://stackoverflow.com/questions/40923080/string-agg-is-not-a-recognized-built-in-function-name