I have read answers here but I am still not quite sure how I would do this regarding two columns of a table and more than one result per query. So, the first query would look like this in my Node app: …
We need to query the DB for students whose points are greater than the average for the uni they go to. Now, in the handbook, it is used with GROUP BY clause, but I fail to understand why one is needed here at all if the universities are already grouped in the inner query’s WHERE condition. Could you someone please
I’m trying to determine if there a “low cost” optimization for the following query. We’ve implemented a system whereby ‘tickets’ earn ‘points’ and thus can be ranked. In order to support analytical type of queries, we store the rank of every ticket (tickets can be tied) with the ticket. I’ve found that, at scale, updating this rank is very slow.
I have 3 tables, with Table B & C referencing Table A via Foreign Key. I want to write a query in PostgreSQL to get all ids from A and also their total occurrences from B & C. Output desired (just the id from A & total count in B & C) : SQL so far SQL Fiddle : The
I’m trying to Write a SELECT statement that returns the category_name column from the Categories table and returns one row for each category that has never been assigned to a product in the Products table. there are four categories in the categories table and only three have been used in the products table. How do i make it show the