[PostgreSQL] ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list

Dung Do Tien Nov 07 2020 670

I have a DB in PostgreSQL. Now I want to get all the info data from Tag table and want to know the content of that tag. I write command select as below:

SELECT DISTINCT t.id, t.keyword as title, t.status,
(CASE 
 WHEN a.type = 1 THEN 'News' 
 WHEN a.type = 2 THEN 'Compare'
 WHEN a.type = 3 THEN 'Tips'
 WHEN a.type = 4 THEN 'New Car'
 WHEN a.type = 5 THEN 'Gallery'
 WHEN a.type = 6 THEN 'Stories'
 ELSE 'Other'
 END
) AS content_type
FROM tags t
LEFT JOIN articletagmapping atm1 ON atm1.tagid = t.id
LEFT JOIN articles a ON a.id = atm1.articleid
ORDER BY t.id DESC, t.isnoindex DESC

But I got an error ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list

ERROR:  for SELECT DISTINCT, ORDER BY expressions must appear in select list
LINE 1: ... a on a.id = atm1.articleid Order by status desc, countartic...
                                                             ^
(execution time: 63 ms; total time: 485 ms)

Please explain to me if you know any reason.

Have 2 answer(s) found.
  • S

    Sandeep Kumar Nov 07 2020

    In PostgreSQL when you want distinct result from SELECT query, column appear in ORDER BY have to appear in DISTINCT command.

    You can change your query as below:

    SELECT DISTINCT t.id, t.keyword as title, t.status, t.isnoindex,
(CASE 
 WHEN a.type = 1 THEN 'News' 
 WHEN a.type = 2 THEN 'Compare'
 WHEN a.type = 3 THEN 'Tips'
 WHEN a.type = 4 THEN 'New Car'
 WHEN a.type = 5 THEN 'Gallery'
 WHEN a.type = 6 THEN 'Stories'
 ELSE 'Other'
 END
) AS content_type
FROM tags t
LEFT JOIN articletagmapping atm1 ON atm1.tagid = t.id
LEFT JOIN articles a ON a.id = atm1.articleid
ORDER BY t.id DESC, t.isnoindex DESC

    I hope this answer is helpful for you.

  • M

    Marry Christ Nov 07 2020

    I think the root cause of the error is that your are ordering using ORDER BY t.id DESC, t.isnoindex DESC, column t.isnoindex does not appear in the SELECT clause. 
    You can remove t.isnoindex column from ORDER BY or add more this column to the SELECT query.

Related Q&A May You Like

  1. MySql throw no database selected, select the default DB to be used by double-clicking its name
  2. How to generate whole sql database script in MySql Workbench
  3. Error querySrv ENODATA _mongodb._tcp.456d in MongoDB Compass
  4. What is best way to convert datetime to date in Sql Server?
  5. How to compare date without time with now() in PostgreSQL?
  6. MySQL Error Code: 1175. safe update mode update a table without a WHERE
  7. ERROR 1819 (HY000): Your password does not satisfy the current policy requirements in MySQL
  8. ERROR: column must appear in the GROUP BY clause or be used in an aggregate function in PostgreSQL
  9. Calculating distance between two positions(lat, long) in SQL Server
  10. MySQL Error: 'Access denied for user 'root'@'localhost'
  11. Error: /opt/lampp/bin/mysql.server: 264: kill: No such process
  12. How to get the total of current connection in PostgreSQL?
  13. How to backup and restore MSSQL Server database in Ubuntu
  14. ERROR: OFFSET must not be negative in PostgreSQL
  15. How to update top N records for a table in PostgreSQL?
Leave An Answer
* NOTE: You need Login before leave an answer

* Type maximum 2000 characters.

* All comments have to wait approved before display.

* Please polite comment and respect questions and answers of others.

Most Quizs Popular

Start Test

Javascript - Functions

Start Test

Asp.Net Core - Exam test 01

Start Test

Asp.Net Core - Exam test 02

Start Test

C# - Level Beginner

Popular Tips

This site uses cookies so that we can remember you and understand how you interact with our website. This allows us to improve and customize your browsing experience. See our Cookies Policy.
X Close