Whenever i have to execute sql commands in pgAdmin 4 i have to append schema_name with tables.
Eg :-
SELECT * FROM my_schema.users //where myschema is schema name
ORDER BY id ASC
Is there any way to execute sql commands in pgAdmin 4 without schema name, by setting a default schema in advance.
Some thing like this
SELECT * FROM programme
ORDER BY id ASC
- without specifying schema name with table.
Is there a way to set default schema in pgAdmin 4 for querying in sql tool?
You can do it in 2 ways:
SET search_path = my_schema, "$user", public; -- For current session only
ALTER ROLE your_role SET search_path = my_schema, "$user", public; -- Persistent, for role
You can also set it for whole database, same way as for role.
EDIT: Just to explain what this does - it will change where and in what order Postgres will search for objects matching object identifiers that did not get prefixed with schema name.
You might need also to restart pgAdmin4 in order for the search_path to start working. At least it was my case.
A good double check if the search_path was set in pgAdmin4 is to go to:
Login/Group Roles -> Right click on the user (by default it is 'postgres') -> Properties -> Parameters tab. Here you should see your new parameter 'search_path' with the value 'your_schema_name'.
Related
Can I use CREATE SCHEMA AUTHORIZATION for something other than the current user's schema?
I can do the following:
CREATE USER MAIN_USER
IDENTIFIED BY main_user_pass;
GRANT CREATE SESSION TO MAIN_USER;
GRANT CREATE TABLE TO MAIN_USER;
ALTER SESSION SET CURRENT_SCHEMA = MAIN_USER;
Query 1:
SELECT USER FROM DUAL;
Result 1:
SYS
Query 2:
SELECT sys_context( 'userenv', 'current_schema') FROM dual;
Result 2:
MAIN_USER
I can do this:
CREATE SCHEMA AUTHORIZATION SYS
CREATE TABLE new_product
(color VARCHAR2(10) PRIMARY KEY);
Result:
Schema AUTHORIZATION created.
But when I try to do this, an error appears:
CREATE SCHEMA AUTHORIZATION MAIN_USER
CREATE TABLE new_product
(color VARCHAR2(10) PRIMARY KEY);
Result:
ORA-02421: missing or invalid schema authorization identifier
02421. 00000 - "missing or invalid schema authorization identifier"
*Cause: the schema name is missing or is incorrect in an authorization
clause of a create schema statement.
*Action: If the name is present, it must be the same as the current
schema.
The error message is pretty clear: you can't do that. From the documentation:
The schema name must be the same as your Oracle Database username.
Setting current_schema only changes the default schema name prepended to an object reference in a SQL command that isn't fully qualified, so after setting it to MAIN_USER, this command:
select * table table_a;
would be interpreted as
select * from main_user.table_a;
instead of
select * from sys.table_a;
Setting current_schema doesn't actually change your logged in identity or affect your privileges in any way, and if sys can't execute a command like that against another schema then nobody can do it.
Can I use CREATE SCHEMA AUTHORIZATION for something other than the current user's schema?
No, you can't. The documentation says:
Use the CREATE SCHEMA statement to create multiple tables and views and perform multiple grants in your own schema in a single transaction.
This statement lets you populate your schema ...
Specify the name of the schema. The schema name must be the same as your Oracle Database username.
You have to be connected as the schema owner, so user returns MAIN_USER. Just changing your current schema with ALTER SESSION SET CURRENT_SCHEMA is not sufficient.
It also says:
To issue a CREATE SCHEMA statement, you must have the privileges necessary to issue the included statements.
and you have granted CREATE TABLE so that should work once you connect as that user. But it means you can't rely on the privileged SYS user's CREATE ANY privs to bypass the schema grants, which might have been an advantage had it been allowed to work as you hoped; if you want your user to end up without those privileges you'll have to grant them, run CREATE SCHEMA as that user, then revoke them again. Or go back to individual CREATE object statements, which you can run for another user as SYS - but without the all-or-nothing single-transaction benefit you get from CREATE SCHEMA.
I am new with DB2.
I am not able to get data from a table without using the schema name. If I use a schema name with table name, I am able to fetch data.
Example:
SELECT * FROM TABLE_NAME;
It is giving me error, while
SELECT FROM SCHEMA_NAME.TABLE_NAME;
is fetching a result.
What do I have to set up not to always have to use the schema name?
By default, your username is used as the schema name for unqualified object names. You can see the current schema with, e.g. VALUES CURRENT SCHEMA. You can change the current schema for you current session with SET SCHEMA new_schema_name, or via e.g. a JDBC connection parameter. Most query tools also have a place to specify/change the current schema.
See the manual page for SET SCHEMA https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.sql.ref.doc/doc/r0001016.html
The full rules for the qualification of unqualified objects is here https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000720.html#r0000720__unq-alias
E.g.
Unqualified alias, index, package, sequence, table, trigger, and view names are implicitly qualified by the default schema.
However, you can create a public alias for a table, module or sequence if you wish to be able to reference it regardless of your CURRENT SCHEMA value.
https://www.ibm.com/support/knowledgecenter/SSEPGG_11.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r0000910.html
(P.S. all the above assumes you are using Db2 LUW)
Try using SET SCHEMA to set the default schema to be used in the session:
SET SCHEMA SCHEMA_NAME;
SELECT * FROM TABLE_NAME;
When using DBeaver - right click on connection > Connection Settings > Initialization, and select your default DB and default Schema:
After that, open your SQL Script and select Active DB:
Encountered this issue when trying to modify the search_path to my new Redshift db.
Presently, I've migrated the contents of my MySQL db into a redshift cluster via AWS' Data Migration Service. The data was imported into a schema lets call my_schema. When I try to execute queries against the cluster it requires me to prefix table names with the schema name
i.e.
select * from my_schema.my_table
I wanted to change the setup so that I can reference the table directly without needing the prefix. After a bit of looking around I found out that this was possible by modifying the search_path attribute.
First I tried doing this by running
set search_path = "$user", my_schema;
This appeared to work but then I realized that this was simply setting my_schema as the default schema in the context of the current session, I wanted it set on a database level. I found several sources saying that the way to do this was to use the alter command like so...
alter database my_db set search_path = "$user", public, my_schema
However, running this command results in the following error which somehow shows up in 0 google results:
SET/RESET commmand in ALTER DATABASE is not supported
I'm pretty baffled by how the above error hasn't ever had a post made about it but I'm also pretty interested in figuring out how to resolve my initial issue of setting a global default schema for my redshift cluster.
ALTER DATABASE SET is not supported in Redshift. However you can SET/RESET configuration parameters at USER level using the ALTER USER SET SEARCH_PATH TO <SCHEMA1>,<SCHMEA2>;
Please check: http://docs.aws.amazon.com/redshift/latest/dg/r_ALTER_USER.html
http://docs.aws.amazon.com/redshift/latest/dg/r_search_path.html
When you set the search_path to <SCHEMA1>,<SCHMEA2> in db1 for a user it is not for just current session, it will be set for all future sessions.
THis doesn't work, resulting in ERROR: relation "user" does not exist
select * from "user"
This one does
select * from "dbo"."user"
Tables that aren't schema-qualified are searched for on the search_path. This doesn't search every schema. By default it only searches:
pg_catalog (implicitly always first, not listed on search_path)
pg_temp tablespaces (implicit, not listed on search_path)
A schema named after the current user, listed as $user in search_path
The public schema
If you want PostgreSQL to look elsewhere you have to modify the search_path to tell it so, or fully schema-qualify the name.
See the PostgreSQL manual on search_path.
Also, note that unlike some databases the name dbo has no particular significance in PostgreSQL. It's just another name.
I have a schema called application. Is there a way that, rather than using the syntax
SELECT * FROM application.table
I can set the default schema so that I can just use
SELECT * FROM table
It would be the same idea as a using statement I suppose.
The default schema for all sql server users is "dbo", You can alter the default schema for a user by using commands ALTER USER
ALTER USER UserName WITH DEFAULT_SCHEMA = application;
It will be great to have a use statement for schemas.
You can vote the feature suggestion on Microsoft connect.