sql-order-by

I want to create a rating with weight depending on number of votes. So, 1 voting with 5 can't be better than 4 votings with 4. I found this math form: bayesian = ( (avg_num_votes * avg_rating) + (this_num_votes * this_rating) ) / (avg_num_votes + this_num_votes) How can I make a MySQL SELECT to get the ID of the best rating image. I got a table for IMAGE, and a table for VOTING VOTING: id imageID totalVotes avgVote I think I got to do this with SELECT in SELECT, but how? A first step is to calculate avg_num_votes and avg_rating : SELECT SUM(totalVotes)/COUNT(*) AS avg_num_votes, SUM(avgVote)

So I have a query like this: SELECT tablea.name, tablea.views from tablea inner join tableb on (tablea.id = tableb.id and tablea.balance > 0) order by tablea.views asc limit 1 However, the problem is that when I run it, it runs quite slow (4+ seconds). Interestingly, when the 'order by' clause is removed, while keeping the limit 1, it runs in 0.005 seconds (approx). Even more interestingly: when I don't join it to tableb, i.e.: SELECT tablea.name, tablea.views from tablea where tablea.balance > 0 order by tablea.views asc limit 1 The query runs in 0.005 seconds usually. Notes: The column views

I have a prize_value column in one of the MySQL tables and now I need to do sorting based on this. This column is actually VARCHAR and has currency symbols attached with it. But not for all the values. The currency symbol can be USD(dollar sign), POUND or INR (Rupee Symbol). So currently the order by is not working properly. How can I fix this without removing the currency symbol manually ? Here are some sample values in the column: .50 £10 £100 $15 $20 £25 £50 10 ₹30 You need two columns: one for the value, a float/double (or an integer) that can be ordered, used in operations such as sums,

Ok, I'm trying to base something similar off of this, but not quite getting it nailed: GROUP BY and ORDER BY Basically, wanting a query to find the latest messages in each 'thread' between the current logged-in user and any other users, but via a flat (non-'threaded') table of messages: messages { id, from_uid, to_uid, message_text, time_added } Assuming the current user's uid is '1', and the latest message in each 'thread' could either be from that user, or to that user (the other party always denoted by thread_recipient): SELECT a.*,thread_recipient FROM messages a JOIN (SELECT IF(from_uid =

I have a column in SQL Server that contains data like this: 1.1.1.QuestionText 1.1.1.Question 1.1.1(a).Questions 1.1.2.Questionswithtext 1.1.2(b).Text 10.1.1.Answers 2.1.1.Questions 2.2.2.QuestionText How do I display this in ascending order? This should work: SELECT name FROM ( SELECT name, SUBSTRING(name, 1, LEN(name) - PATINDEX('%[0-9]%', REVERSE(name)) + 1) n FROM #tmp ) v ORDER BY CAST(PARSENAME(n, 4) AS INT), CAST(PARSENAME(n, 3) AS INT), CAST(PARSENAME(n, 2) AS INT), CAST(PARSENAME(n, 1) AS INT) Output: name 1.1.1.QuestionText 1.1.1.Question 1.1.1(a).Questions 1.1.2.Questionswithtext 1

I receive a list of UserIds(about 1000 at a time) sorted by 'Income'. I have User records in "my system's database" but the 'Income' column is not there. I want to retrieve the Users from "my system's database" in the Sorted Order as received in the list. I tried doing the following using Active Record expecting that the records would be retrieved in the same order as in the Sorted List but it does not work. //PSEUDO CODE User.all(:conditions => {:id => [SORTED LIST]}) I found an answer to a similar question at the link below, but am not sure how to implement the suggested solution using

Hello I am using linq to fill a gridview with the information from an xml from codebehind. I would like to order my Grid according to one of my elements in the xml ("value element") but can't figure out how to do this. Any ideas? gvResourceEditor.DataSource = (From resElem In resourceElements.Elements("data") _ Select New With { _ .Key = resElem.Attribute("name").Value, _ .Value = HttpUtility.HtmlEncode(resElem.Element("value").Value), _ .Comment = If(resElem.Element("comment") IsNot Nothing, HttpUtility.HtmlEncode(resElem.Element("comment").Value), String.Empty) _ }).OrderBy(?????)

I have a view that is joining two tables and ordering by the first table. Except that the order isn't correct. It misses an occasional record, and then at the end, most of those records exist in order, and then at that end, the rest of the records exist in order. So it has records such as 1 (most of the records in order) 2 4 5 6 7 8 10 11 13 15 3 (the first set of missing records) 12 9 (the rest of the missing records) 14 My view is below. Do I need to do the order by before I do the join? What am I doing wrong? (I've acquired this view, and the exact same view in another db instance works