.. _schema_dialog:

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The Schema Dialog 
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Use the *Schema* dialog to define a schema. A schema is the organizational workhorse of a database, similar to directories or namespaces. To create a schema, you must be a database superuser or have the CREATE privilege.  

The *Schema* dialog organizes the development of schema through the following dialog tabs: *General* and *Security*. The *SQL* tab displays the SQL code generated by dialog selections. 
 
.. image:: images/schema_general.png

Use the fields on the *General* tab to identify the schema.

* Use the *Name* field to add a descriptive name for the schema. The name will be displayed in the *pgAdmin* tree control.
* Select the owner of the schema from the drop-down listbox in the *Owner* field.
* Store notes about the schema in the *Comment* field.  

Click the *Security* tab to continue.

.. image:: images/schema_security.png

Use the *Security* tab to assign privileges and security labels for the schema. 

Click the *Add* icon (+) to assign a set of privileges in the *Privileges* panel:

* Select the name of the role from the drop-down listbox in the *Grantee* field.
* Click inside the *Privileges* field. Check the boxes to the left of one or more privileges to grant the selected privileges to the specified user.
* Select the name of the role that is granting the privilege from the drop-down listbox in the *Grantor* field. The default grantor is the owner of the schema.

Click the *Add* icon (+) to assign additional sets of privileges; to discard a privilege, click the trash icon to the left of the row and confirm deletion in the *Delete Row* popup.

Click the *Add* icon (+) to assign a security label in the *Security Labels* panel:

* Specify a security label provider in the *Provider* field. The named provider must be loaded and must consent to the proposed labeling operation.
* Specify a a security label in the *Security Label* field. The meaning of a given label is at the discretion of the label provider. PostgreSQL places no restrictions on whether or how a label provider must interpret security labels; it merely provides a mechanism for storing them. 

Click the *Add* icon (+) to assign additional security labels; to discard a security label, click the trash icon to the left of the row and confirm deletion in the *Delete Row* popup.

Click the *Default Privileges* tab to continue.

.. image:: images/schema_default_privileges.png

Use the *Default Privileges* tab to grant privileges for tables, sequences, functions and types. Use the tabs nested inside the *Default Privileges* tab to specify the database object and click the *Add* icon (+) to assign a set of privileges:

* Select the name of a role that will be granted privileges in the schema from the drop-down listbox in the *Grantee* field.
* Click inside the *Privileges* field. Check the boxes to the left of one or more privileges to grant the selected privileges to the specified user.
* Select the name of the role that is granting the privilege from the drop-down listbox in the *Grantor* field. The default grantor is the owner of the schema.

Click the *SQL* tab to continue.

Your entries in the *Schema* dialog generate a SQL command (see an example below). Use the *SQL* tab for review; revisit or switch tabs to make any changes to the SQL command.

**Example**

The following is an example of the sql command generated by selections made in the *Schema* dialog: 

.. image:: images/schema_sql.png

The example creates a schema named hr; the command grants *USAGE* privileges to *public* and assigns the ability to grant privileges to *alice*.
 
* Click the *Info* button (i) to access online help. View context-sensitive help in the *Tabbed browser*, where a new tab displays the PostgreSQL core documentation.
* Click the *Save* button to save work.
* Click the *Cancel* button to exit without saving work.
* Click the *Reset* button to restore configuration parameters.


 
