34 Why can't we use aggregate function 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:
And I would like to put it in my GROUP BY clause, but this seems to cause problems because there is an aggregate function in column. Is there a way to GROUP BY a column alias such as some_product in this case, or do I need to put this in a subquery and group on that?
The SQL GROUP BY clause can be used in a SELECT statement to collect data across multiple records and group the results by one or more columns. In more simple words GROUP BY statement is used in conjunction with the aggregate functions to group the result-set by one or more columns.
sql parameterised cte query The answer to that question involves a situation where pivot without aggregation is needed so an example of doing it is part of the solution.
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 any example how it wo...
Functionally, if you use GROUP BY with no Aggregate functions in the select, you are just doing a DISTINCT. Oracle seems to use different methods for each, but it ends with the same result.
4 If you don't specify GROUP BY, aggregate functions operate over all the records selected. In that case, it doesn't make sense to also select a specific column like EmployeeID.
ERROR: column "makerar.wmname" must appear in the GROUP BY clause or be used in an aggregate function LINE 1: SELECT cname, wmname, MAX(avg) FROM makerar GROUP BY cname;
The aggregate function and the group by clause aren't separate things, they're parts of the same thing that appear in different places in the query. If you wish to aggregate on a column, you must say what function to use for aggregation; if you wish to have an aggregation function, it has to be applied over some column.
SELECT department, SUM(sales) as "Total sales" FROM order_details GROUP BY department HAVING SUM(sales) > 1000; Which will exclude all sales with a value less than or equal to 1000 from the summing aggregation. But how do you filter after the aggregation? E.g. WHERE ("Total sales"> 15000) Edit: Ironically I was only including HAVING SUM(sales) > 1000; in order to prevent confusion about the ...
