How to Fill blank Fields with other column QGIS

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up vote
2
down vote

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I have two columns of the same data and I want to unite



for example I have the column "pole_type" and "pole_type_"
and sometimes one has values and some times the other



like seen in the photo



enter image description here



I want to get all the values in "pole_type_" into "pole_type" so I can delete the first



Iv'e used so far the following rules but not succeeded



IF(NULL,"pole_type_","pole_type")


or



IF("pole_type='',"pole_type_","pole_type")


and so on
but I havn't came up with anything that works.






qgis field-calculator






share

















  • 1




    Assuming empty are blank, not NULL (your second example), try adding a second = and remove the space : IF("pole_type"=="","pole_type_","pole_type")
    – smiller
    55 mins ago











  • Are you able to perform a selection of your data (outside of the calculator) for either blank or NULL? An example of selecting for NULL is here: gis.stackexchange.com/questions/16134
    – smiller
    52 mins ago










  • In the screenshots your column is called "/_pole_type" (with an underscore at the start) but your formulas use "pole_type_" (with an underscore at the end).
    – csk
    32 mins ago















up vote
2
down vote

favorite












I have two columns of the same data and I want to unite



for example I have the column "pole_type" and "pole_type_"
and sometimes one has values and some times the other



like seen in the photo



enter image description here



I want to get all the values in "pole_type_" into "pole_type" so I can delete the first



Iv'e used so far the following rules but not succeeded



IF(NULL,"pole_type_","pole_type")


or



IF("pole_type='',"pole_type_","pole_type")


and so on
but I havn't came up with anything that works.






qgis field-calculator






share

















  • 1




    Assuming empty are blank, not NULL (your second example), try adding a second = and remove the space : IF("pole_type"=="","pole_type_","pole_type")
    – smiller
    55 mins ago











  • Are you able to perform a selection of your data (outside of the calculator) for either blank or NULL? An example of selecting for NULL is here: gis.stackexchange.com/questions/16134
    – smiller
    52 mins ago










  • In the screenshots your column is called "/_pole_type" (with an underscore at the start) but your formulas use "pole_type_" (with an underscore at the end).
    – csk
    32 mins ago













up vote
2
down vote

favorite









up vote
2
down vote

favorite











I have two columns of the same data and I want to unite



for example I have the column "pole_type" and "pole_type_"
and sometimes one has values and some times the other



like seen in the photo



enter image description here



I want to get all the values in "pole_type_" into "pole_type" so I can delete the first



Iv'e used so far the following rules but not succeeded



IF(NULL,"pole_type_","pole_type")


or



IF("pole_type='',"pole_type_","pole_type")


and so on
but I havn't came up with anything that works.






qgis field-calculator






share













I have two columns of the same data and I want to unite



for example I have the column "pole_type" and "pole_type_"
and sometimes one has values and some times the other



like seen in the photo



enter image description here



I want to get all the values in "pole_type_" into "pole_type" so I can delete the first



Iv'e used so far the following rules but not succeeded



IF(NULL,"pole_type_","pole_type")


or



IF("pole_type='',"pole_type_","pole_type")


and so on
but I havn't came up with anything that works.






qgis field-calculator




qgis field-calculator





share












share










share



share










asked 1 hour ago









tristramit

657




657







  • 1




    Assuming empty are blank, not NULL (your second example), try adding a second = and remove the space : IF("pole_type"=="","pole_type_","pole_type")
    – smiller
    55 mins ago











  • Are you able to perform a selection of your data (outside of the calculator) for either blank or NULL? An example of selecting for NULL is here: gis.stackexchange.com/questions/16134
    – smiller
    52 mins ago










  • In the screenshots your column is called "/_pole_type" (with an underscore at the start) but your formulas use "pole_type_" (with an underscore at the end).
    – csk
    32 mins ago













  • 1




    Assuming empty are blank, not NULL (your second example), try adding a second = and remove the space : IF("pole_type"=="","pole_type_","pole_type")
    – smiller
    55 mins ago











  • Are you able to perform a selection of your data (outside of the calculator) for either blank or NULL? An example of selecting for NULL is here: gis.stackexchange.com/questions/16134
    – smiller
    52 mins ago










  • In the screenshots your column is called "/_pole_type" (with an underscore at the start) but your formulas use "pole_type_" (with an underscore at the end).
    – csk
    32 mins ago








1




1




Assuming empty are blank, not NULL (your second example), try adding a second = and remove the space : IF("pole_type"=="","pole_type_","pole_type")
– smiller
55 mins ago





Assuming empty are blank, not NULL (your second example), try adding a second = and remove the space : IF("pole_type"=="","pole_type_","pole_type")
– smiller
55 mins ago













Are you able to perform a selection of your data (outside of the calculator) for either blank or NULL? An example of selecting for NULL is here: gis.stackexchange.com/questions/16134
– smiller
52 mins ago




Are you able to perform a selection of your data (outside of the calculator) for either blank or NULL? An example of selecting for NULL is here: gis.stackexchange.com/questions/16134
– smiller
52 mins ago












In the screenshots your column is called "/_pole_type" (with an underscore at the start) but your formulas use "pole_type_" (with an underscore at the end).
– csk
32 mins ago





In the screenshots your column is called "/_pole_type" (with an underscore at the start) but your formulas use "pole_type_" (with an underscore at the end).
– csk
32 mins ago











2 Answers
2






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up vote
3
down vote













Welcome to the wonders of COALESCE. Try this:



COALESCE( "pole_type_" , "pole_type" )



It will return the first non-null value in a list. If they are all null, it will return null.






share|improve this answer



























    up vote
    0
    down vote













    You can use:



    CASE
    WHEN "pole_type" IS NULL THEN "pole_type_"
    ELSE "pole_type"
    END






    share|improve this answer




















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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes








      up vote
      3
      down vote













      Welcome to the wonders of COALESCE. Try this:



      COALESCE( "pole_type_" , "pole_type" )



      It will return the first non-null value in a list. If they are all null, it will return null.






      share|improve this answer
























        up vote
        3
        down vote













        Welcome to the wonders of COALESCE. Try this:



        COALESCE( "pole_type_" , "pole_type" )



        It will return the first non-null value in a list. If they are all null, it will return null.






        share|improve this answer






















          up vote
          3
          down vote










          up vote
          3
          down vote









          Welcome to the wonders of COALESCE. Try this:



          COALESCE( "pole_type_" , "pole_type" )



          It will return the first non-null value in a list. If they are all null, it will return null.






          share|improve this answer












          Welcome to the wonders of COALESCE. Try this:



          COALESCE( "pole_type_" , "pole_type" )



          It will return the first non-null value in a list. If they are all null, it will return null.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 50 mins ago









          Hayden Elza

          1436




          1436






















              up vote
              0
              down vote













              You can use:



              CASE
              WHEN "pole_type" IS NULL THEN "pole_type_"
              ELSE "pole_type"
              END






              share|improve this answer
























                up vote
                0
                down vote













                You can use:



                CASE
                WHEN "pole_type" IS NULL THEN "pole_type_"
                ELSE "pole_type"
                END






                share|improve this answer






















                  up vote
                  0
                  down vote










                  up vote
                  0
                  down vote









                  You can use:



                  CASE
                  WHEN "pole_type" IS NULL THEN "pole_type_"
                  ELSE "pole_type"
                  END






                  share|improve this answer












                  You can use:



                  CASE
                  WHEN "pole_type" IS NULL THEN "pole_type_"
                  ELSE "pole_type"
                  END







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 24 mins ago









                  Bhekani Khumalo

                  112




                  112



























                       

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