LAST QUESTIONS. Hibernate : Caused by: java.sql.SQLException: Operand should contain 1 column(s). And, of course, we only want each salesperson ID to be displayed once in the results – we don’t really care about all of their order amounts, just their highest order amount value. As we mentioned above, MySQL would allow you to run a query like this without throwing any error: But, SQL Server actually does throw an error which says “ORDER BY items must appear in the select list if SELECT DISTINCT is specified”. You can follow the question or vote as … Find if string contains another string – php. What’s the difference between a male lion and a female? What trees are used to make cricket bats? So, in the query above we are asking MySQL to retrieve every distinct value of the salesperson_id and order those results by their corresponding Amount value. but impossible. Walter Cruz Feb 15, 2007 at 11:19 am Hiring? Can every recursive function be made iterative? Does Pentagon know where every satellite is? Post a JOB or your RESUME on our JOB BOARD >>. Meaning of “where there’s smoke there’s fire”. How often does it rain in Chile’s Atacama desert? When I try to order by creation date: How do I get the distinct part to still work while ordering by creation date? But, the problem here is that the salespeople with salesperson_id values of 2 and 7 both have multiple orders in the Orders table. Is mysql database logic suitable for query? What share does Mark Zuckerberg own of Facebook? So, running the SQL above would give us these results, which is correct: Finally we have a query that makes sense, which also gives us results that make sense! BUT I need the distinct because it returns duplicate records. Press J to jump to the feed. I'm not sure what does @store.comments syntax means so this could possibly not work. This will serve as a ranking of the salespeople to see who has the most valuable orders. Is a restart to Apache required after a change to .htaccess file? I'm not a SQL guru, but I guess this might be the cause of the problem. How do I let users input any number of input values in Python? Ionic 2 - how to make ion-button with icon and text on two lines? Difference between a left outer join and right outer join? What is Bank Of America’s international phone number? Press question mark to learn the rest of the keyboard shortcuts We are asking for every distinct salesperson_id in the Orders table, ordered by their corresponding order Amount. The expressions can (and usually do) refer to columns computed in the FROM clause. 5 comments Milestone. Look closely at the SQL and you will see what I mean – do we ever actually specify to choose the highest Amount for EACH salesperson_id and to use that value? What is the cost of a 5 day Oyster card pass in London’s underground tube? 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Is there a way to merge two dataframes and only keep a certain number of occurrences? And for the “group” of salesperson ID’s equal to 2, the maximum value of the amount would be 2400. Take a look at the Orders table and you can see that every row in the table has a distinct combination of the salesperson_id and Amount values, which also means that the salesperson_id and Amount will be returned from every row in the table when the SQL above is run. [closed] August 08, 2017, at 6:04 PM ... Home MySQL SELECT DISTINCT ON expressions must match initial ORDER BY expressions. Following is my stored procedure. Then, we can order the results by the maximum value in each group of salesperson_ids. sql - multiple - django select distinct on expressions must match initial order by expressions . If you guessed group by you would be correct – because in order to find the highest value for a group of salesperson_id’s, we would need to use the GROUP BY statement. This thread is locked. What’s the difference between a class variable and an instance variable? Values are undefined when trying to export an object form an array by element's index in Node.js, MySQL: Structuring Notification System For Small To Large Applications, I have a problem between nodejs express and bootstrap, This is a piece of MySQL code which is running in the background of one of the website. Well, because we never really told SQL that is what we actually wanted! Now suppose that we want to retrieve all of the salesperson ID’s and sort them in descending order according to their highest respective Order Amount value (that would be the Amount column). "for SELECT DISTINCT, ORDER BY expressions must appear in select list" - is that the standart or a limitation of postgresql? 解决 PostgreSQL 报 ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list SQL herman 1年前 (2019-11-02) 968浏览 公告: “业余草”微信公众号提供免费CSDN下载服务(只下Java资源),关注业余草微信公众号,添加作者微信:codedq,发送下载链接帮助你免费下载! How much of the world’s land is covered by desert? What’s the difference between a compiled and an interpreted language? (Currently, Derby uses sorting to evaluate DISTINCT. And that means the problem is that the SQL is not specific enough – we have to tell the RDBMS exactly what we want in order to get the right results, otherwise you get results that do not make sense. How to password protect a file in .htaccess, How to disable password protection in .htaccess, How to password protect a directory using .htaccess. The only reason MySQL allows it is because it assumes you know what you are doing – the query would actually make sense if the Amount value was the same across different rows for a given salesperson_id. SELECT DISTINCT ON expressions must match initial ORDER BY expressions. Does Coca Cola come from same plant as cocaine? Now that we have a more specific question in mind, let’s see if we can come up with a more specific answerso that we can write the correct SQL. 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