Sep 9, 2025 · Query with aggregate functions is very slow Ask Question Asked 6 months ago Modified 6 months ago

Jun 23, 2023 · According to Itzik Ben-Gan in his book T-SQL fundamentals (a book that I really enjoyed), when using aggregation functions, you would need to include a GROUP BY clause to specify the …

Apr 21, 2017 · 2 First and Last do not exist in Sql Server 2005 or 2008, but in Sql Server 2012 there is a First_Value, Last_Value function. I tried to implement the aggregate First and Last for Sql Server …

Nov 19, 2013 · SQL requires that if a column is in the SELECT clause and is not used within an aggregate function, it must be included in the GROUP BY clause. Since resource.rId is selected but …

May 13, 2014 · If you are using an aggregate function in a where clause then it means you want to filter data on the basis of that aggregation function. In my case, it's SUM().

Dec 7, 2010 · The only type of functions you can write in pure T-SQL are scalar and table valued functions. Compare the pages for CREATE AGGREGATE, which only lists CLR style options, with …

Aug 24, 2023 · No - there are no such aggregate functions in TSQL. The problem with FIRST and LAST is that you need a way of specifying that the rows going into the aggregate should be treated as …

Oct 18, 2017 · Regarding any Standard SQL has an aggregate function any but for a different use case. Again, what you (MS Access SQL) suggest for any gives you a non-deterministic result, which is not …

@AlexPoole - I read the question to mean, "Why did the designers of SQL need to restrict the use of aggregate functions, so they can only be in a HAVING clause and not in WHERE?

I'm finding a way to aggregate strings from different rows into a single row. I'm looking to do this in many different places, so having a function to facilitate this would be nice. I've tried solu...