How to concatenate psql variables in tablename?












0















I am trying to concatenate some fixed string with a variable to build a table name. This simple example demonstrates the problem. The variable "suffix" resolved properly, but "prefix" does not because I am unable to figure out how to tell psql that "ws" is not part of the variable name.



What is the proper syntax so that the resultant query selects from "my_ws_group" ?



localhost ~ > psql -v prefix=my -v suffix=group
psql (8.4.4.10, server 8.0.2)
WARNING: psql version 8.4, server version 8.0.
Some psql features might not work.
SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
Type "help" for help.

dev=> select * from :prefix_ws_:suffix;
ERROR: syntax error at or near ":"
LINE 1: select * from :prefix_ws_group;
^
dev=>


I prefer to use psql 8.4 because that is most compatible with Redshift.










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    0















    I am trying to concatenate some fixed string with a variable to build a table name. This simple example demonstrates the problem. The variable "suffix" resolved properly, but "prefix" does not because I am unable to figure out how to tell psql that "ws" is not part of the variable name.



    What is the proper syntax so that the resultant query selects from "my_ws_group" ?



    localhost ~ > psql -v prefix=my -v suffix=group
    psql (8.4.4.10, server 8.0.2)
    WARNING: psql version 8.4, server version 8.0.
    Some psql features might not work.
    SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
    Type "help" for help.

    dev=> select * from :prefix_ws_:suffix;
    ERROR: syntax error at or near ":"
    LINE 1: select * from :prefix_ws_group;
    ^
    dev=>


    I prefer to use psql 8.4 because that is most compatible with Redshift.










    share|improve this question














    bumped to the homepage by Community 23 mins ago


    This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.


















      0












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      0








      I am trying to concatenate some fixed string with a variable to build a table name. This simple example demonstrates the problem. The variable "suffix" resolved properly, but "prefix" does not because I am unable to figure out how to tell psql that "ws" is not part of the variable name.



      What is the proper syntax so that the resultant query selects from "my_ws_group" ?



      localhost ~ > psql -v prefix=my -v suffix=group
      psql (8.4.4.10, server 8.0.2)
      WARNING: psql version 8.4, server version 8.0.
      Some psql features might not work.
      SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
      Type "help" for help.

      dev=> select * from :prefix_ws_:suffix;
      ERROR: syntax error at or near ":"
      LINE 1: select * from :prefix_ws_group;
      ^
      dev=>


      I prefer to use psql 8.4 because that is most compatible with Redshift.










      share|improve this question














      I am trying to concatenate some fixed string with a variable to build a table name. This simple example demonstrates the problem. The variable "suffix" resolved properly, but "prefix" does not because I am unable to figure out how to tell psql that "ws" is not part of the variable name.



      What is the proper syntax so that the resultant query selects from "my_ws_group" ?



      localhost ~ > psql -v prefix=my -v suffix=group
      psql (8.4.4.10, server 8.0.2)
      WARNING: psql version 8.4, server version 8.0.
      Some psql features might not work.
      SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
      Type "help" for help.

      dev=> select * from :prefix_ws_:suffix;
      ERROR: syntax error at or near ":"
      LINE 1: select * from :prefix_ws_group;
      ^
      dev=>


      I prefer to use psql 8.4 because that is most compatible with Redshift.







      psql redshift






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      share|improve this question










      asked Feb 22 '16 at 17:35









      superwesmansuperwesman

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      bumped to the homepage by Community 23 mins ago


      This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.







      bumped to the homepage by Community 23 mins ago


      This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
























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          psql's pattern matching is not strong feature, so your query cannot be performed.



          When parsing your string, psql finds the :prefix_ws_ since it cannot match/find :prefix, but that variable isn't defined by -v option, so psql ignores it. Next, psql finds :suffix, then replaces to group since it is defined.



          Additionally if you write "select * from :prefix:suffix", psql can replace both variables such as "select * from mygroup".






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            psql's pattern matching is not strong feature, so your query cannot be performed.



            When parsing your string, psql finds the :prefix_ws_ since it cannot match/find :prefix, but that variable isn't defined by -v option, so psql ignores it. Next, psql finds :suffix, then replaces to group since it is defined.



            Additionally if you write "select * from :prefix:suffix", psql can replace both variables such as "select * from mygroup".






            share|improve this answer






























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              psql's pattern matching is not strong feature, so your query cannot be performed.



              When parsing your string, psql finds the :prefix_ws_ since it cannot match/find :prefix, but that variable isn't defined by -v option, so psql ignores it. Next, psql finds :suffix, then replaces to group since it is defined.



              Additionally if you write "select * from :prefix:suffix", psql can replace both variables such as "select * from mygroup".






              share|improve this answer




























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                0







                psql's pattern matching is not strong feature, so your query cannot be performed.



                When parsing your string, psql finds the :prefix_ws_ since it cannot match/find :prefix, but that variable isn't defined by -v option, so psql ignores it. Next, psql finds :suffix, then replaces to group since it is defined.



                Additionally if you write "select * from :prefix:suffix", psql can replace both variables such as "select * from mygroup".






                share|improve this answer















                psql's pattern matching is not strong feature, so your query cannot be performed.



                When parsing your string, psql finds the :prefix_ws_ since it cannot match/find :prefix, but that variable isn't defined by -v option, so psql ignores it. Next, psql finds :suffix, then replaces to group since it is defined.



                Additionally if you write "select * from :prefix:suffix", psql can replace both variables such as "select * from mygroup".







                share|improve this answer














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                share|improve this answer








                edited Feb 23 '16 at 3:30

























                answered Feb 22 '16 at 19:37









                shxshx

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