What is the difference between PARTITION BY and GROUP BY
-- Classic SELECT a, COUNT(*) FROM t GROUP BY a -- Using window functions SELECT DISTINCT a, COUNT(*) OVER (PARTITION BY a) FROM t The key difference is: Window …
Aggregate function in SQL WHERE-Clause - Stack Overflow
May 13, 2014 · In a test at university there was a question; is it possible to use an aggregate function in the SQL WHERE clause. I always thought this isn't possible and I also can't find …
How do I select columns together with aggregate functions?
Jun 23, 2012 · You have two aggregate functions ; a COUNT and a SUM; this means that you are required to do some grouping and the general rule of thumb is GROUP BY the non aggregate …
sql - Use Aggregate Function in UNION ALL result set - Stack …
Jul 9, 2013 · How can I use aggregate Functions in UNION ALL Resultset FOR EXAMPLE SELECT A,B FROM MyTable UNION ALL SELECT B,C FROM MYAnotherTable Result Set …
Why is there no PRODUCT aggregate function in SQL?
Oct 12, 2010 · Out of interest, there is indeed demand in SQL Server Land for new set functions but for those of the window function variety (and Standard SQL, too). For more details, …
Applying the MIN aggregate function to a BIT field
Also, I always run into this sort of issue when I'm forced to aggregate a field that I know (due to constraints) will always be the same value, so why can't there just be an aggregate function …
SQL Server pivot on 2 (or multiple) aggregates - Stack Overflow
Jul 27, 2017 · You could simplify your query a bit. Example. Select * From ( Select A.CustName ,A.OrderedProduct ,B.*
How to SUM and SUBTRACT using SQL? - Stack Overflow
I have get total QTY using SQL 'GROUP BY' clause. I need to deduct/subtract BAL_QTY from SUM of ITEM (master_table). I've got SUM QTY value using query (actually there are many …
Why are aggregate functions not allowed in where clause
Aggregate functions work on sets of data. A WHERE clause doesn't have access to entire set, but only to the row that it is currently working on. You can of course use HAVING clause:
sql - How to use aggregate function using LIMIT? - Stack Overflow
Nov 19, 2012 · SQL limit by an aggregate. 1. Aggregate function with limit and without full table scan. 3. SQL limit by ...