How to prevent duplicate column rows in the MySQL database while keeping the order down












0














How can you please help me I have a table in the database with a column called "recioient_id"
The value of its rows is repeated more than once How do I prevent repeating rows while keeping the order descending and displaying the last row
I have tried so much without a find
I did this query and was good at preventing repetition and did not display the last row
Query which was:



SELECT *
FROM `messages`
WHERE `sender_id` = 1
GROUP BY `recioient_id` DESC
HAVING COUNT(*) >= 1


Here is a sample table



https://drive.google.com/file/d/13fmMB_znYUiy-hvfMgai0a_znOIHjcfU/view?usp=sharing



I hope to be successful in translation and hope to help










share|improve this question





























    0














    How can you please help me I have a table in the database with a column called "recioient_id"
    The value of its rows is repeated more than once How do I prevent repeating rows while keeping the order descending and displaying the last row
    I have tried so much without a find
    I did this query and was good at preventing repetition and did not display the last row
    Query which was:



    SELECT *
    FROM `messages`
    WHERE `sender_id` = 1
    GROUP BY `recioient_id` DESC
    HAVING COUNT(*) >= 1


    Here is a sample table



    https://drive.google.com/file/d/13fmMB_znYUiy-hvfMgai0a_znOIHjcfU/view?usp=sharing



    I hope to be successful in translation and hope to help










    share|improve this question



























      0












      0








      0







      How can you please help me I have a table in the database with a column called "recioient_id"
      The value of its rows is repeated more than once How do I prevent repeating rows while keeping the order descending and displaying the last row
      I have tried so much without a find
      I did this query and was good at preventing repetition and did not display the last row
      Query which was:



      SELECT *
      FROM `messages`
      WHERE `sender_id` = 1
      GROUP BY `recioient_id` DESC
      HAVING COUNT(*) >= 1


      Here is a sample table



      https://drive.google.com/file/d/13fmMB_znYUiy-hvfMgai0a_znOIHjcfU/view?usp=sharing



      I hope to be successful in translation and hope to help










      share|improve this question















      How can you please help me I have a table in the database with a column called "recioient_id"
      The value of its rows is repeated more than once How do I prevent repeating rows while keeping the order descending and displaying the last row
      I have tried so much without a find
      I did this query and was good at preventing repetition and did not display the last row
      Query which was:



      SELECT *
      FROM `messages`
      WHERE `sender_id` = 1
      GROUP BY `recioient_id` DESC
      HAVING COUNT(*) >= 1


      Here is a sample table



      https://drive.google.com/file/d/13fmMB_znYUiy-hvfMgai0a_znOIHjcfU/view?usp=sharing



      I hope to be successful in translation and hope to help







      mysql sql






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 23 at 3:02









      Gordon Linoff

      756k35291399




      756k35291399










      asked Nov 23 at 2:56









      salem715

      74




      74
























          1 Answer
          1






          active

          oldest

          votes


















          0














          If you want one row per recioient_id, use filtering. I would recommend a correlated subquery:



          SELECT m.*
          FROM messages m
          WHERE m.sender_id = 1 AND
          m.messages_id = (SELECT MAX(m2.messages_id)
          FROM messages m2
          WHERE m2.sender_id = m.sender_id AND
          m2.recioient_id = m.recioient_id
          )
          ORDER BY m.recioient_id;





          share|improve this answer























          • This is a good thank you but what about the descending order where I can put DESC
            – salem715
            Nov 23 at 3:16










          • @salem715 . . . Add an order by to the outermost select, if you want the results in a particular order.
            – Gordon Linoff
            Nov 23 at 3:21










          • Thank you. You've solved the descending order by your code. I owe you hope I can find a way to express my gratitude to you
            – salem715
            Nov 23 at 3:25











          Your Answer






          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "1"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: true,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: 10,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53440139%2fhow-to-prevent-duplicate-column-rows-in-the-mysql-database-while-keeping-the-ord%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          0














          If you want one row per recioient_id, use filtering. I would recommend a correlated subquery:



          SELECT m.*
          FROM messages m
          WHERE m.sender_id = 1 AND
          m.messages_id = (SELECT MAX(m2.messages_id)
          FROM messages m2
          WHERE m2.sender_id = m.sender_id AND
          m2.recioient_id = m.recioient_id
          )
          ORDER BY m.recioient_id;





          share|improve this answer























          • This is a good thank you but what about the descending order where I can put DESC
            – salem715
            Nov 23 at 3:16










          • @salem715 . . . Add an order by to the outermost select, if you want the results in a particular order.
            – Gordon Linoff
            Nov 23 at 3:21










          • Thank you. You've solved the descending order by your code. I owe you hope I can find a way to express my gratitude to you
            – salem715
            Nov 23 at 3:25
















          0














          If you want one row per recioient_id, use filtering. I would recommend a correlated subquery:



          SELECT m.*
          FROM messages m
          WHERE m.sender_id = 1 AND
          m.messages_id = (SELECT MAX(m2.messages_id)
          FROM messages m2
          WHERE m2.sender_id = m.sender_id AND
          m2.recioient_id = m.recioient_id
          )
          ORDER BY m.recioient_id;





          share|improve this answer























          • This is a good thank you but what about the descending order where I can put DESC
            – salem715
            Nov 23 at 3:16










          • @salem715 . . . Add an order by to the outermost select, if you want the results in a particular order.
            – Gordon Linoff
            Nov 23 at 3:21










          • Thank you. You've solved the descending order by your code. I owe you hope I can find a way to express my gratitude to you
            – salem715
            Nov 23 at 3:25














          0












          0








          0






          If you want one row per recioient_id, use filtering. I would recommend a correlated subquery:



          SELECT m.*
          FROM messages m
          WHERE m.sender_id = 1 AND
          m.messages_id = (SELECT MAX(m2.messages_id)
          FROM messages m2
          WHERE m2.sender_id = m.sender_id AND
          m2.recioient_id = m.recioient_id
          )
          ORDER BY m.recioient_id;





          share|improve this answer














          If you want one row per recioient_id, use filtering. I would recommend a correlated subquery:



          SELECT m.*
          FROM messages m
          WHERE m.sender_id = 1 AND
          m.messages_id = (SELECT MAX(m2.messages_id)
          FROM messages m2
          WHERE m2.sender_id = m.sender_id AND
          m2.recioient_id = m.recioient_id
          )
          ORDER BY m.recioient_id;






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 23 at 3:21

























          answered Nov 23 at 3:04









          Gordon Linoff

          756k35291399




          756k35291399












          • This is a good thank you but what about the descending order where I can put DESC
            – salem715
            Nov 23 at 3:16










          • @salem715 . . . Add an order by to the outermost select, if you want the results in a particular order.
            – Gordon Linoff
            Nov 23 at 3:21










          • Thank you. You've solved the descending order by your code. I owe you hope I can find a way to express my gratitude to you
            – salem715
            Nov 23 at 3:25


















          • This is a good thank you but what about the descending order where I can put DESC
            – salem715
            Nov 23 at 3:16










          • @salem715 . . . Add an order by to the outermost select, if you want the results in a particular order.
            – Gordon Linoff
            Nov 23 at 3:21










          • Thank you. You've solved the descending order by your code. I owe you hope I can find a way to express my gratitude to you
            – salem715
            Nov 23 at 3:25
















          This is a good thank you but what about the descending order where I can put DESC
          – salem715
          Nov 23 at 3:16




          This is a good thank you but what about the descending order where I can put DESC
          – salem715
          Nov 23 at 3:16












          @salem715 . . . Add an order by to the outermost select, if you want the results in a particular order.
          – Gordon Linoff
          Nov 23 at 3:21




          @salem715 . . . Add an order by to the outermost select, if you want the results in a particular order.
          – Gordon Linoff
          Nov 23 at 3:21












          Thank you. You've solved the descending order by your code. I owe you hope I can find a way to express my gratitude to you
          – salem715
          Nov 23 at 3:25




          Thank you. You've solved the descending order by your code. I owe you hope I can find a way to express my gratitude to you
          – salem715
          Nov 23 at 3:25


















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Stack Overflow!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.





          Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


          Please pay close attention to the following guidance:


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53440139%2fhow-to-prevent-duplicate-column-rows-in-the-mysql-database-while-keeping-the-ord%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          A CLEAN and SIMPLE way to add appendices to Table of Contents and bookmarks

          Calculate evaluation metrics using cross_val_predict sklearn

          Insert data from modal to MySQL (multiple modal on website)