View Dialog v8
Use the View
dialog to define a view. The view is not physically materialized; the query is executed each time the view is referenced in a query.
The View
dialog organizes the development of a View through the following dialog tabs: General
, Definition, Code
and Security". The SQL
tab displays the SQL code generated by dialog selections.
Click the General
tab to begin.
Use the fields in the General
tab to identify a view:
- Use the
Name
field to add a descriptive name for the view. The name of the view must be distinct from the name of any other view, table, sequence, index or foreign table in the same schema. The name will be displayed in theBrowser
tree control. - Use the drop-down listbox next to
Owner
to select the role that will own the view. - If applicable, select the name of the schema in which the view will reside from the drop-down listbox in the
Schema
field. - Store notes about the view in the
Comments
field.
Click the Definition
tab to continue.
Use the fields in the Definition
tab to define properties of the view:
- Set the
Security Barrier
switch toYes
to indicate that the view is to act as a security barrier. For more information about defining and using a security barrier rule, see Section 38.5 of the PostgreSQL documentation. - Use the drop-down listbox next to
Check options
to select fromNo
, Local orCascaded
:- The
Local
option specifies that new rows are only checked against the conditions defined in the view. Any conditions defined on underlying base views are not checked (unless you specify the CHECK OPTION). - The
Cascaded
option specifies new rows are checked against the conditions of the view and all underlying base views.
- The
Click the Code
tab to continue.
Use the workspace in the Code
tab to write a query to create a view.
Click the Security
tab to continue.
Use the Security
tab to assign privileges and define security labels.
Use the Privileges
panel to assign privileges to a role. Click the Add
icon (+) to set privileges for the view:
- Select the name of the role that will be granted privileges 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 privilege to the specified user. - The current user, who is the default grantor for granting the privilege, is displayed in the
Grantor
field.
Click the Add
icon (+) to assign additional privileges; to discard a privilege, click the trash icon to the left of the row and confirm deletion in the Delete Row
popup.
Use the Security Labels
panel to define security labels applied to the view. Click the Add
icon (+) to add each security label selection:
- 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 SQL
tab to continue.
Your entries in the View
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 user selections in the View
dialog:
The example shown demonstrates creating a view named distributor_codes
that includes the content of the code
column from the distributors
table.
- Click the
Info
button (i) to access online help. View context-sensitive help in theTabbed 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.