How to concatenate psql variables in tablename?
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
asked Feb 22 '16 at 17:35
superwesmansuperwesman
11
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.
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
asked Feb 22 '16 at 17:35
superwesmansuperwesman
11
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.
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
asked Feb 22 '16 at 17:35
superwesmansuperwesman
11
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
psql redshift
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
asked Feb 22 '16 at 17:35
superwesmansuperwesman
11
asked Feb 22 '16 at 17:35
superwesmansuperwesman
11
11
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.
add a comment |
add a comment |
1 Answer
1
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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".
answered Feb 22 '16 at 19:37
shxshx
66746
add a comment |
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1 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".
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".
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".
answered Feb 22 '16 at 19:37
shxshx
66746
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".
answered Feb 22 '16 at 19:37
shxshx
66746
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
66746
add a comment |
add a comment |
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