Grant deny permission stacking

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For the role db_denycustomer, I want only the column code of the customer table to be SELECTable, and none of the others. So I did this:



DENY SELECT ON dbo.customer TO db_denycustomer
GRANT SELECT ON dbo.customer (code) TO db_denycustomer


...and it works fine. Cool! But, why?



What I've read in related articles is that permissions stack, but DENY takes precedence. In contrast, in my case, it seems that the last permission "query" took precedence. Sure enough, if I execute them in reverse order, the latter DENY hides the code column too.



Could you please elaborate on this?



I have also included the default db_datawriter and db_datareader roles to the user that I tested with.






sql-server permissions role







share|improve this question





























    up vote
    9
    down vote

    favorite












    For the role db_denycustomer, I want only the column code of the customer table to be SELECTable, and none of the others. So I did this:



    DENY SELECT ON dbo.customer TO db_denycustomer
    GRANT SELECT ON dbo.customer (code) TO db_denycustomer


    ...and it works fine. Cool! But, why?



    What I've read in related articles is that permissions stack, but DENY takes precedence. In contrast, in my case, it seems that the last permission "query" took precedence. Sure enough, if I execute them in reverse order, the latter DENY hides the code column too.



    Could you please elaborate on this?



    I have also included the default db_datawriter and db_datareader roles to the user that I tested with.






    sql-server permissions role







    share|improve this question

























      up vote
      9
      down vote

      favorite









      up vote
      9
      down vote

      favorite











      For the role db_denycustomer, I want only the column code of the customer table to be SELECTable, and none of the others. So I did this:



      DENY SELECT ON dbo.customer TO db_denycustomer
      GRANT SELECT ON dbo.customer (code) TO db_denycustomer


      ...and it works fine. Cool! But, why?



      What I've read in related articles is that permissions stack, but DENY takes precedence. In contrast, in my case, it seems that the last permission "query" took precedence. Sure enough, if I execute them in reverse order, the latter DENY hides the code column too.



      Could you please elaborate on this?



      I have also included the default db_datawriter and db_datareader roles to the user that I tested with.






      sql-server permissions role







      share|improve this question















      For the role db_denycustomer, I want only the column code of the customer table to be SELECTable, and none of the others. So I did this:



      DENY SELECT ON dbo.customer TO db_denycustomer
      GRANT SELECT ON dbo.customer (code) TO db_denycustomer


      ...and it works fine. Cool! But, why?



      What I've read in related articles is that permissions stack, but DENY takes precedence. In contrast, in my case, it seems that the last permission "query" took precedence. Sure enough, if I execute them in reverse order, the latter DENY hides the code column too.



      Could you please elaborate on this?



      I have also included the default db_datawriter and db_datareader roles to the user that I tested with.






      sql-server permissions role




      sql-server permissions role






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited yesterday









      Paul White♦

      46.5k14251398




      46.5k14251398










      asked yesterday









      George Menoutis

      1534




      1534




















          1 Answer
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          up vote
          10
          down vote



          accepted










          This is documented behavior provided for backwards compatibility. Documentation excerpt:




          Caution A table-level DENY does not take precedence over a
          column-level GRANT. This inconsistency in the permissions hierarchy
          has been preserved for backward compatibility.







          share|improve this answer




















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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            10
            down vote



            accepted










            This is documented behavior provided for backwards compatibility. Documentation excerpt:




            Caution A table-level DENY does not take precedence over a
            column-level GRANT. This inconsistency in the permissions hierarchy
            has been preserved for backward compatibility.







            share|improve this answer
























              up vote
              10
              down vote



              accepted










              This is documented behavior provided for backwards compatibility. Documentation excerpt:




              Caution A table-level DENY does not take precedence over a
              column-level GRANT. This inconsistency in the permissions hierarchy
              has been preserved for backward compatibility.







              share|improve this answer






















                up vote
                10
                down vote



                accepted







                up vote
                10
                down vote



                accepted






                This is documented behavior provided for backwards compatibility. Documentation excerpt:




                Caution A table-level DENY does not take precedence over a
                column-level GRANT. This inconsistency in the permissions hierarchy
                has been preserved for backward compatibility.







                share|improve this answer












                This is documented behavior provided for backwards compatibility. Documentation excerpt:




                Caution A table-level DENY does not take precedence over a
                column-level GRANT. This inconsistency in the permissions hierarchy
                has been preserved for backward compatibility.








                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered yesterday









                Dan Guzman

                12.3k11533




                12.3k11533



























                     

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