Creating a View¶
Function¶
This statement is used to create views.
Syntax¶
CREATE [OR REPLACE] VIEW view_name AS select_statement;
Keywords¶
CREATE VIEW: creates views based on the given select statement. The result of the select statement will not be written into the disk.
OR REPLACE: updates views using the select statement. No error is reported and the view definition is updated using the SELECT statement if a view exists.
Precautions¶
The view to be created must not exist in the current database. Otherwise, an error will be reported. When the view exists, you can add keyword OR REPLACE to avoid the error message.
The table or view information contained in the view cannot be modified. If the table or view information is modified, the query may fail.
If the compute engines used for creating tables and views are different, the view query may fail due to incompatible varchar types.
For example, if a table is created using Spark 3.x, you are advised to use Spark 2.x to create a view.
Example¶
To create a view named student_view for the queried ID and name of the student table, run the following statement:
CREATE VIEW student_view AS SELECT id, name FROM student;