July 2012
Intermediate to advanced
816 pages
27h 38m
English
Content preview from Programming Microsoft® SQL Server® 2012Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CLR Aggregates
T-SQL has a number of built-in aggregates, such as SUM, AVG, and MAX, but that set of built-in functions is not always sufficient. Luckily, the SQL CLR features in SQL Server 2012 allow us to implement user-defined aggregates in .NET code and use them from T-SQL. User-defined aggregates can be implemented only in SQL CLR code; they have no T-SQL equivalent. Because aggregates tend to perform computation only, they provide an excellent use case for SQL CLR code. As it turns out, they are also quite easy to build.
At first, aggregates look and feel like functions because they accept and return values. In fact, if you use an aggregate in a non-data-querying T-SQL call (for example, SELECT SUM(8)), you are actually treating the aggregate ...
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