Fresh postgres installation, db 'test', table 'Graeber' created from another program.
I want to see the content of table 'Graeber'. When I connect to the database and try to select the content of 'Graeber', the application tells me : ERROR: relation "graeber" does not exist.
See screenshot:
What is wrong here?
Try adding the schema as in:
select *
from public.Graeber
If that doesn't work, then it is because you have a capital letter so try:
select *
from public."Graeber"
Hope this helps.
When using the psql console in cmd, sometimes you may forget to add ';' at the end of select statement
Example -1: select * from user #does not give any result back
select * from user; #this works with ';' at the end
Don't take me wrong I faced this issue in Postgresql version 13
See This Example.
queuerecords=# create table employee(id int,name varchar(100));
CREATE TABLE
queuerecords=# insert into employee values(1,'UsmanYaqoob');
INSERT 0 1
queuerecords=# select * from employee;
id | name
----+-------------
1 | UsmanYaqoob
(1 row)
Related
I'm trying to run the following PHP script to do a simple database query:
$db_host = "localhost";
$db_name = "showfinder";
$username = "user";
$password = "password";
$dbconn = pg_connect("host=$db_host dbname=$db_name user=$username password=$password")
or die('Could not connect: ' . pg_last_error());
$query = 'SELECT * FROM sf_bands LIMIT 10';
$result = pg_query($query) or die('Query failed: ' . pg_last_error());
This produces the following error:
Query failed: ERROR: relation "sf_bands" does not exist
In all the examples I can find where someone gets an error stating the relation does not exist, it's because they use uppercase letters in their table name. My table name does not have uppercase letters. Is there a way to query my table without including the database name, i.e. showfinder.sf_bands?
From what I've read, this error means that you're not referencing the table name correctly. One common reason is that the table is defined with a mixed-case spelling, and you're trying to query it with all lower-case.
In other words, the following fails:
CREATE TABLE "SF_Bands" ( ... );
SELECT * FROM sf_bands; -- ERROR!
Use double-quotes to delimit identifiers so you can use the specific mixed-case spelling as the table is defined.
SELECT * FROM "SF_Bands";
Re your comment, you can add a schema to the "search_path" so that when you reference a table name without qualifying its schema, the query will match that table name by checked each schema in order. Just like PATH in the shell or include_path in PHP, etc. You can check your current schema search path:
SHOW search_path
"$user",public
You can change your schema search path:
SET search_path TO showfinder,public;
See also http://www.postgresql.org/docs/8.3/static/ddl-schemas.html
I had problems with this and this is the story (sad but true) :
If your table name is all lower case like : accounts
you can use: select * from AcCounTs and it will work fine
If your table name is all lower case like : accounts
The following will fail:
select * from "AcCounTs"
If your table name is mixed case like : Accounts
The following will fail:
select * from accounts
If your table name is mixed case like : Accounts
The following will work OK:
select * from "Accounts"
I dont like remembering useless stuff like this but you have to ;)
Postgres process query different from other RDMS. Put schema name in double quote before your table name like this, "SCHEMA_NAME"."SF_Bands"
Put the dbname parameter in your connection string. It works for me while everything else failed.
Also when doing the select, specify the your_schema.your_table like this:
select * from my_schema.your_table
If a table name contains underscores or upper case, you need to surround it in double-quotes.
SELECT * from "Table_Name";
I had a similar problem on OSX but tried to play around with double and single quotes. For your case, you could try something like this
$query = 'SELECT * FROM "sf_bands"'; // NOTE: double quotes on "sf_Bands"
This is realy helpfull
SET search_path TO schema,public;
I digged this issues more, and found out about how to set this "search_path" by defoult for a new user in current database.
Open DataBase Properties then open Sheet "Variables"
and simply add this variable for your user with actual value.
So now your user will get this schema_name by defoult and you could use tableName without schemaName.
You must write schema name and table name in qutotation mark. As below:
select * from "schemaName"."tableName";
I had the same issue as above and I am using PostgreSQL 10.5.
I tried everything as above but nothing seems to be working.
Then I closed the pgadmin and opened a session for the PSQL terminal.
Logged into the PSQL and connected to the database and schema respectively :
\c <DATABASE_NAME>;
set search_path to <SCHEMA_NAME>;
Then, restarted the pgadmin console and then I was able to work without issue in the query-tool of the pagadmin.
For me the problem was, that I had used a query to that particular table while Django was initialized. Of course it will then throw an error, because those tables did not exist. In my case, it was a get_or_create method within a admin.py file, that was executed whenever the software ran any kind of operation (in this case the migration). Hope that helps someone.
In addition to Bill Karwin's answer =>
Yes, you should surround the table name with double quotes. However, be aware that most probably php will not allow you to just write simply:
$query = "SELECT * FROM "SF_Bands"";
Instead, you should use single quotes while surrounding the query as sav said.
$query = 'SELECT * FROM "SF_Bands"';
You have to add the schema first e.g.
SELECT * FROM place.user_place;
If you don't want to add that in all queries then try this:
SET search_path TO place;
Now it will works:
SELECT * FROM user_place;
Easiest workaround is Just change the table name and all column names to lowercase and your issue will be resolved.
For example:
Change Table_Name to table_name and
Change ColumnName to columnname
It might be silly for a few, but in my case - once I created the table I could able to query the table on the same session, but if I relogin with new session table does not exits.
Then I used commit just after creating the table and now I could able to find and query the table in the new session as well. Like this:
select * from my_schema.my_tbl;
Hope this would help a few.
Make sure that Table name doesn't contain any trailing whitespaces
Try this: SCHEMA_NAME.TABLE_NAME
I'd suggest checking if you run the migrations or if the table exists in the database.
I tried every good answer ( upvote > 10) but not works.
I met this problem in pgAdmin4.
so my solution is quite simple:
find the target table / scheme.
mouse right click, and click: query-tool
in this new query tool window, you can run your SQL without specifying set search_path to <SCHEMA_NAME>;
you can see the result:
I can alias a table name in a Postgres statement like this:
SELECT a.id FROM very_long_table_name AS a;
Is there a mechanism to set up a similar alias that persists for a psql session?
For example:
$: psql -d sample
sample=# CREATE ALIAS a for very_long_table_name;
sample=# select id from a limit 1;
id
____
1
As shown in the manual this can be done using psql variables:
sample=# \set a 'very_long_table_name'
sample=# select id from :a limit 1;
id
----
1
(1 row)
If you don't want to run \set every time manually, you can include your common short names in ~/.psqlrc which is read when you start psql
I don't know of a way to create such an alias, but you may create a view on top of your table, and give it a short name, e.g.
CREATE VIEW short_name AS
SELECT *
FROM very_long_table_name;
Then, use the view name as you would the alias. Since views generally perform as well as the underlying tables, with regard to indices, you should not lose much in terms of performance.
I think the best option is to create a temporary view.
This solution is not restricted to psql.
CREATE TABLE averylongname (id integer PRIMARY KEY);
INSERT INTO averylongname VALUES (1);
CREATE TEMPORARY VIEW x AS SELECT * FROM averylongname;
The view will automatically vanish when your database session ends, and it can be used with DML statements as well:
INSERT INTO x VALUES (2);
SELECT * FROM x;
id
----
1
2
(2 rows)
I'm trying to run the following PHP script to do a simple database query:
$db_host = "localhost";
$db_name = "showfinder";
$username = "user";
$password = "password";
$dbconn = pg_connect("host=$db_host dbname=$db_name user=$username password=$password")
or die('Could not connect: ' . pg_last_error());
$query = 'SELECT * FROM sf_bands LIMIT 10';
$result = pg_query($query) or die('Query failed: ' . pg_last_error());
This produces the following error:
Query failed: ERROR: relation "sf_bands" does not exist
In all the examples I can find where someone gets an error stating the relation does not exist, it's because they use uppercase letters in their table name. My table name does not have uppercase letters. Is there a way to query my table without including the database name, i.e. showfinder.sf_bands?
From what I've read, this error means that you're not referencing the table name correctly. One common reason is that the table is defined with a mixed-case spelling, and you're trying to query it with all lower-case.
In other words, the following fails:
CREATE TABLE "SF_Bands" ( ... );
SELECT * FROM sf_bands; -- ERROR!
Use double-quotes to delimit identifiers so you can use the specific mixed-case spelling as the table is defined.
SELECT * FROM "SF_Bands";
Re your comment, you can add a schema to the "search_path" so that when you reference a table name without qualifying its schema, the query will match that table name by checked each schema in order. Just like PATH in the shell or include_path in PHP, etc. You can check your current schema search path:
SHOW search_path
"$user",public
You can change your schema search path:
SET search_path TO showfinder,public;
See also http://www.postgresql.org/docs/8.3/static/ddl-schemas.html
I had problems with this and this is the story (sad but true) :
If your table name is all lower case like : accounts
you can use: select * from AcCounTs and it will work fine
If your table name is all lower case like : accounts
The following will fail:
select * from "AcCounTs"
If your table name is mixed case like : Accounts
The following will fail:
select * from accounts
If your table name is mixed case like : Accounts
The following will work OK:
select * from "Accounts"
I dont like remembering useless stuff like this but you have to ;)
Postgres process query different from other RDMS. Put schema name in double quote before your table name like this, "SCHEMA_NAME"."SF_Bands"
Put the dbname parameter in your connection string. It works for me while everything else failed.
Also when doing the select, specify the your_schema.your_table like this:
select * from my_schema.your_table
If a table name contains underscores or upper case, you need to surround it in double-quotes.
SELECT * from "Table_Name";
I had a similar problem on OSX but tried to play around with double and single quotes. For your case, you could try something like this
$query = 'SELECT * FROM "sf_bands"'; // NOTE: double quotes on "sf_Bands"
This is realy helpfull
SET search_path TO schema,public;
I digged this issues more, and found out about how to set this "search_path" by defoult for a new user in current database.
Open DataBase Properties then open Sheet "Variables"
and simply add this variable for your user with actual value.
So now your user will get this schema_name by defoult and you could use tableName without schemaName.
You must write schema name and table name in qutotation mark. As below:
select * from "schemaName"."tableName";
I had the same issue as above and I am using PostgreSQL 10.5.
I tried everything as above but nothing seems to be working.
Then I closed the pgadmin and opened a session for the PSQL terminal.
Logged into the PSQL and connected to the database and schema respectively :
\c <DATABASE_NAME>;
set search_path to <SCHEMA_NAME>;
Then, restarted the pgadmin console and then I was able to work without issue in the query-tool of the pagadmin.
For me the problem was, that I had used a query to that particular table while Django was initialized. Of course it will then throw an error, because those tables did not exist. In my case, it was a get_or_create method within a admin.py file, that was executed whenever the software ran any kind of operation (in this case the migration). Hope that helps someone.
In addition to Bill Karwin's answer =>
Yes, you should surround the table name with double quotes. However, be aware that most probably php will not allow you to just write simply:
$query = "SELECT * FROM "SF_Bands"";
Instead, you should use single quotes while surrounding the query as sav said.
$query = 'SELECT * FROM "SF_Bands"';
You have to add the schema first e.g.
SELECT * FROM place.user_place;
If you don't want to add that in all queries then try this:
SET search_path TO place;
Now it will works:
SELECT * FROM user_place;
Easiest workaround is Just change the table name and all column names to lowercase and your issue will be resolved.
For example:
Change Table_Name to table_name and
Change ColumnName to columnname
It might be silly for a few, but in my case - once I created the table I could able to query the table on the same session, but if I relogin with new session table does not exits.
Then I used commit just after creating the table and now I could able to find and query the table in the new session as well. Like this:
select * from my_schema.my_tbl;
Hope this would help a few.
Make sure that Table name doesn't contain any trailing whitespaces
Try this: SCHEMA_NAME.TABLE_NAME
I'd suggest checking if you run the migrations or if the table exists in the database.
I tried every good answer ( upvote > 10) but not works.
I met this problem in pgAdmin4.
so my solution is quite simple:
find the target table / scheme.
mouse right click, and click: query-tool
in this new query tool window, you can run your SQL without specifying set search_path to <SCHEMA_NAME>;
you can see the result:
I am trying to do the postgresql equivalent of mysql select * from table on a postgresql specific database. I can find the name of the table I need within that database when I do:
SELECT table_name FROM information_schema.tables WHERE table_schema = 'public';
But when I try a select all on the table, I get:
SELECT * from Sample;
SELECT * from Sample;
ERROR: relation "sample" does not exist
LINE 1: SELECT * from Sample;
^
Any ideas?
Postgresql is case sensitive.
I usually use all lower char for field, tables and functions.
Anyway, you can double quote them.
To full answer your question and see why and when useing quote, i suggest to read this specific section:
http://www.postgresql.org/docs/current/interactive/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
The manes of the tables are stored in information_schema.tables so you have to see your table by using select * from information_schema.tables. IF your table_schema is "public"
try for a table select select * from public.sample, is your table_schema a differed schema chance it to the right one.
this link will help you Psotgresql doc
I tried single-quoting 'Sample' and it didn't work. Fixed by double-quoting "Sample".
I am trying to start playing with postgres and found a very strange thing, I created a table using pgadminIII named testtable and added couple of column then I wrote following query in query editor
SELECT * from testtable;
it responded no table found with such name, then after that I tried
select * from "testtable"
with quotes(later one) it worked, then I dropped the table and created the table using script editor, with same name making it sure no quotes are around the name, then both query started working, I can't understand stand what that exactly mean, even if I write "teablename" in create table statement quotes shouldn't become the part of the table name.
Also, how can I make sure while using pgAdmin graphical user interface that all object get created without quote (of course if above problem because of that)?
Update: Environment Info
OS => Windows Server 2008 x64, Postgres => 9.0.3-2 x64, pgAdmin => >
Version 1.12.2 (March 22, 2011, rev:>
REL-1_12_2)
Did you use the new table dialog the first time? You shouldn't use quotes in the dialog as pgAdmin will insert all necessary quotes.
Edit
I discovered something today what is a little weird and might explain what happened to you.
When you do not quote a table name the table name it is converted to lowercase. So if you do
CREATE TABLE TestTable ( ... );
Your table will be called testtable
What happens when you start to query the table is this:
SELECT * FROM TestTable; -- succeeds looks for testtable
SELECT * FROM testtable; -- succeeds
SELECT * FROM "TestTable"; -- fails because case doesn't match
Now if you had done:
CREATE TABLE "TestTable" ( ... );
Your table would actually be called TestTable with the case preserved and the result is
SELECT * FROM TestTable; -- fails looks for testtable
SELECT * FROM testtable; -- fails
SELECT * FROM "TestTable"; -- succeeds