I saw this tweet recently, where Richie Rump asked what has changed in T-SQL since the SQL Server 2012 version. A few people from Microsoft responded that there were changes in all versions, and while I think some versions have few changes, I decided to look.

SQL Server 2012 introduced the window functions with the OVER() clause to SQL Server. This was a huge change in that many aggregate queries were much easier to write without needing complex GROUP BY lists and subqueries or unions to join together different data. While I'm not an expert by any means, I find lots of queries for reporting easier to write with the window functions, and I've grown to enjoy using these in code.

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