How to use view of navicat

Using views in Navicat

What is a view?

A view is essentially a virtual table in a database that retrieves data from one or more tables and presents it to the user in a specific way. The view does not store the actual data, but is generated dynamically based on the query results.

Create a view in Navicat

1. Open the database connection.
2. Right-click the database or schema in the Browse panel.
3. Select Create > View.
4. In the Create View wizard, enter a name for the view.
5. Write SQL queries in the Query tab to define the view.
6. Click OK to create the view.

Benefits of using views

• Data abstraction: Views can hide the complexity of the underlying table structure, making data easier to access and understand.
• Data Security: Views can limit access to sensitive data and display only fields or rows required by the user.
• Data Integrity: Views can automatically perform data verification and constraints to ensure data accuracy.
• Performance optimization: Views can improve performance by caching results from common queries.

Manage views in Navicat

• View View: Right-click on the view and select View Data.
• Edit view: Right-click on the view and select Edit.
• Delete View: Right-click on the view and select Delete.
• Refresh the view: Right-click on the view and select Refresh.

Example

Suppose there is a table called "Employees" that contains the following columns:

• Employee ID
• Name
• Department ID

To create a view that shows the number of employees in each department, you can use the following SQL query:

<code>CREATE VIEW 部门员工数量AS SELECT 部门ID, COUNT(*) AS 员工数量FROM 员工GROUP BY 部门ID;</code>

Once the view is created, it will appear in the Browse panel and can be used like a normal table.

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