Question: How do I create a view in MySQL?

How do I create a view in SQL Workbench?

The syntax for the CREATE VIEW statement in MySQL is: CREATE [OR REPLACE] VIEW view_name AS SELECT columns FROM tables [WHERE conditions]; OR REPLACE. Optional.

How do you create a database view?

Create a database view

  1. Navigate to System Definition > Database Views.
  2. Click New. …
  3. Name the view as you would name a new table. …
  4. Provide a label and a plural. …
  5. (Optional) Provide a description of the database view so that other users know its purpose.
  6. The database view is added to the Database Views table.

How do I show views in MySQL?

The list of schemas in the database server will show up in the bottom section on the left. Click on the database name that you want to select. The right hand pane should change with the list of all tables in the selected database. Click on Views tab at the top to list all the views in the database.

Is updatable MySQL view?

Introduction to MySQL updatable views

In MySQL, views are not only query-able but also updatable. It means that you can use the INSERT or UPDATE statement to insert or update rows of the base table through the updatable view.

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What triggers MySQL?

A trigger in MySQL is a set of SQL statements that reside in a system catalog. It is a special type of stored procedure that is invoked automatically in response to an event. Each trigger is associated with a table, which is activated on any DML statement such as INSERT, UPDATE, or DELETE.

Are MySQL views faster than queries?

No, a view is simply a stored text query. You can apply WHERE and ORDER against it, the execution plan will be calculated with those clauses taken into consideration.

How do you display in SQL?

The DISPLAY command must be placed immediately after the query statement on which you want it to take effect. For example: SELECT pno, pname FROM part WHERE color=’BLUE’; DISPLAY; When the system encounters this DISPLAY command, it displays the Result window containing the part number and name for all blue parts.

What are the commands of DDL?

Data Definition Language (DDL) commands:

  • CREATE to create a new table or database.
  • ALTER for alteration.
  • Truncate to delete data from the table.
  • DROP to drop a table.
  • RENAME to rename a table.

What is advantage of view in SQL?

Views can provide advantages over tables: Views can represent a subset of the data contained in a table. Consequently, a view can limit the degree of exposure of the underlying tables to the outer world: a given user may have permission to query the view, while denied access to the rest of the base table.

Are views stored in database?

A view is a virtual table whose contents are defined by a query. Like a table, a view consists of a set of named columns and rows of data. Unless indexed, a view does not exist as a stored set of data values in a database.

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How do you write a trigger?

create trigger [trigger_name]: Creates or replaces an existing trigger with the trigger_name. [before | after]: This specifies when the trigger will be executed. {insert | update | delete}: This specifies the DML operation. on [table_name]: This specifies the name of the table associated with the trigger.

How can I see all views in SQL?

SQL Server List Views

  1. SELECT OBJECT_SCHEMA_NAME(v.object_id) schema_name, v.name FROM sys.views as v;
  2. SELECT OBJECT_SCHEMA_NAME(o.object_id) schema_name, o.name FROM sys.objects as o WHERE o.type = ‘V’;

How do I change the view in MySQL?

To modify a view, you use the ALTER VIEW statement. The syntax of the ALTER VIEW statement is similar to the CREATE VIEW statement except that the CREATE keyword is replaced by the ALTER keyword. The following example changes the organization view by adding the email column.