How to group values based on key in Alibaba MaxCompute?












0















I am facing issues when trying to group the values based on the key in Alibaba MaxCompute. I used similar queries before in Alibaba Cloud MaxCompute but now it throws me an error.



For instance,



SELECT * FROM table GROUP BY key;


It should work but it throws me error like




FAILED: ODPS-0130071:[1,8] Semantic analysis exception - column
reference table.value should appear in GROUP BY key




Anyone could help me with this to understand why this error occurs.






hadoop hive alibaba-cloud







share|improve this question





























    0















    I am facing issues when trying to group the values based on the key in Alibaba MaxCompute. I used similar queries before in Alibaba Cloud MaxCompute but now it throws me an error.



    For instance,



    SELECT * FROM table GROUP BY key;


    It should work but it throws me error like




    FAILED: ODPS-0130071:[1,8] Semantic analysis exception - column
    reference table.value should appear in GROUP BY key




    Anyone could help me with this to understand why this error occurs.






    hadoop hive alibaba-cloud







    share|improve this question



























      0












      0








      0








      I am facing issues when trying to group the values based on the key in Alibaba MaxCompute. I used similar queries before in Alibaba Cloud MaxCompute but now it throws me an error.



      For instance,



      SELECT * FROM table GROUP BY key;


      It should work but it throws me error like




      FAILED: ODPS-0130071:[1,8] Semantic analysis exception - column
      reference table.value should appear in GROUP BY key




      Anyone could help me with this to understand why this error occurs.






      hadoop hive alibaba-cloud







      share|improve this question
















      I am facing issues when trying to group the values based on the key in Alibaba MaxCompute. I used similar queries before in Alibaba Cloud MaxCompute but now it throws me an error.



      For instance,



      SELECT * FROM table GROUP BY key;


      It should work but it throws me error like




      FAILED: ODPS-0130071:[1,8] Semantic analysis exception - column
      reference table.value should appear in GROUP BY key




      Anyone could help me with this to understand why this error occurs.






      hadoop hive alibaba-cloud




      hadoop hive alibaba-cloud






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 22 '18 at 2:28









      dhilt

      8,18742243




      8,18742243










      asked Nov 21 '18 at 16:54









      Ranjith UdayakumarRanjith Udayakumar

      32313




      32313
























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          In the earlier version of MaxCompute, select * from group by key is supported even when the columns that match * are not included in the GROUP BY key. Compatible with Hive, MaxCompute 2.0 prohibits this syntax unless the GROUP BY list is a column in all source tables



          Examples:




          Scenario 1: The GROUP BY key does not include all columns.




          Incorrect Syntax:



          SELECT * FROM t GROUP BY key;


          Correct Syntax:



          SELECT DISTINCT key FROM t;



          Scenario 2: The GROUP BY key includes all columns.




          Not recommended syntax:



          SELECT * FROM t GROUP BY key, value; -- t has columns key and value


          Recommended syntax:



          SELECT DISTINCT key, value FROM t;





          share|improve this answer























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            In the earlier version of MaxCompute, select * from group by key is supported even when the columns that match * are not included in the GROUP BY key. Compatible with Hive, MaxCompute 2.0 prohibits this syntax unless the GROUP BY list is a column in all source tables



            Examples:




            Scenario 1: The GROUP BY key does not include all columns.




            Incorrect Syntax:



            SELECT * FROM t GROUP BY key;


            Correct Syntax:



            SELECT DISTINCT key FROM t;



            Scenario 2: The GROUP BY key includes all columns.




            Not recommended syntax:



            SELECT * FROM t GROUP BY key, value; -- t has columns key and value


            Recommended syntax:



            SELECT DISTINCT key, value FROM t;





            share|improve this answer




























              0














              In the earlier version of MaxCompute, select * from group by key is supported even when the columns that match * are not included in the GROUP BY key. Compatible with Hive, MaxCompute 2.0 prohibits this syntax unless the GROUP BY list is a column in all source tables



              Examples:




              Scenario 1: The GROUP BY key does not include all columns.




              Incorrect Syntax:



              SELECT * FROM t GROUP BY key;


              Correct Syntax:



              SELECT DISTINCT key FROM t;



              Scenario 2: The GROUP BY key includes all columns.




              Not recommended syntax:



              SELECT * FROM t GROUP BY key, value; -- t has columns key and value


              Recommended syntax:



              SELECT DISTINCT key, value FROM t;





              share|improve this answer


























                0












                0








                0







                In the earlier version of MaxCompute, select * from group by key is supported even when the columns that match * are not included in the GROUP BY key. Compatible with Hive, MaxCompute 2.0 prohibits this syntax unless the GROUP BY list is a column in all source tables



                Examples:




                Scenario 1: The GROUP BY key does not include all columns.




                Incorrect Syntax:



                SELECT * FROM t GROUP BY key;


                Correct Syntax:



                SELECT DISTINCT key FROM t;



                Scenario 2: The GROUP BY key includes all columns.




                Not recommended syntax:



                SELECT * FROM t GROUP BY key, value; -- t has columns key and value


                Recommended syntax:



                SELECT DISTINCT key, value FROM t;





                share|improve this answer













                In the earlier version of MaxCompute, select * from group by key is supported even when the columns that match * are not included in the GROUP BY key. Compatible with Hive, MaxCompute 2.0 prohibits this syntax unless the GROUP BY list is a column in all source tables



                Examples:




                Scenario 1: The GROUP BY key does not include all columns.




                Incorrect Syntax:



                SELECT * FROM t GROUP BY key;


                Correct Syntax:



                SELECT DISTINCT key FROM t;



                Scenario 2: The GROUP BY key includes all columns.




                Not recommended syntax:



                SELECT * FROM t GROUP BY key, value; -- t has columns key and value


                Recommended syntax:



                SELECT DISTINCT key, value FROM t;






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 21 '18 at 19:34









                VINVIN

                14112




                14112
































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