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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.

psql redshift

share|improve this question

asked Feb 22 '16 at 17:35

superwesmansuperwesman

11

bumped to the homepage by Community♦ 8 mins ago

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

add a comment | 

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.

psql redshift

share|improve this question

asked Feb 22 '16 at 17:35

superwesmansuperwesman

11

bumped to the homepage by Community♦ 8 mins ago

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

add a comment | 

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

share|improve this question

asked Feb 22 '16 at 17:35

superwesmansuperwesman

11

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=>

share|improve this question

asked Feb 22 '16 at 17:35

superwesmansuperwesman

11

share|improve this question

asked Feb 22 '16 at 17:35

superwesmansuperwesman

11

asked Feb 22 '16 at 17:35

superwesmansuperwesman

11

asked Feb 22 '16 at 17:35

superwesmansuperwesman

11

1 Answer
1

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oldest

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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

edited Feb 23 '16 at 3:30

answered Feb 22 '16 at 19:37

shxshx

66746

add a comment | 

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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

edited Feb 23 '16 at 3:30

answered Feb 22 '16 at 19:37

shxshx

66746

add a comment | 

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

edited Feb 23 '16 at 3:30

answered Feb 22 '16 at 19:37

shxshx

66746

add a comment | 

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

edited Feb 23 '16 at 3:30

answered Feb 22 '16 at 19:37

shxshx

66746

share|improve this answer

edited Feb 23 '16 at 3:30

answered Feb 22 '16 at 19:37

shxshx

66746

answered Feb 22 '16 at 19:37

shxshx

66746

answered Feb 22 '16 at 19:37

shxshx

66746