On the next page, choose the type of database system you want to import.įor remote databases, you’ll need the following: Install DBeaver and launch the program.Download the free DBeaver community edition from your Linux/BSD package manager or with the appropriate DBeaver download link.In this tutorial, you have learned about database views and how to use the CREATE VIEW statement to create new views in SQLite.Getting Started with the DBeaver Desktop Application This query returns data from the v_albums view: SELECT * FROM v_albums Code language: SQL (Structured Query Language) ( sql ) In this example, we specified new columns for the view AlbumTitle for the albums.title column and Minutes for the expression SUM(milliseconds) / 60000 The following statement creates a view named v_albums that contains album title and the length of album in minutes: CREATE VIEW v_albums (Ĭode language: SQL (Structured Query Language) ( sql ) Try It 2) Creating a view with custom column names SELECT * FROM v_tracks Code language: SQL (Structured Query Language) ( sql ) To create a view based on this query, you use the following statement: CREATE VIEW v_tracksįrom now on, you can use the following simple query instead of the complex one above. INNER JOIN genres ON genres.GenreId = tracks.GenreId Code language: SQL (Structured Query Language) ( sql ) INNER JOIN media_types ON media_types.MediaTypeId = tracks.MediaTypeId INNER JOIN albums ON Albums.AlbumId = tracks.AlbumId The following query gets data from the tracks, albums, media_types and genres tables in the sample database using the inner join clause. 1) Creating a view to simplify a complex query Let’s take some examples of creating a new view using the CREATE VIEW statement. However, you can assign the names of the view columns that are different from the column name of the table By default, the columns of the view derive from the result set of the SELECT statement. Third, specify a SELECT statement for the view. The view is called a temporary view and SQLite automatically removes the temporary view whenever the database connection is closed. Second, use the the TEMP or TEMPORARY option if you want the view to be only visible in the current database connection. If the view already exists, it does nothing. The IF NOT EXISTS option only creates a new view if it doesn’t exist. To create a view, you use the CREATE VIEW statement as follows: CREATE VIEW view_nameĪS select- statement Code language: SQL (Structured Query Language) ( sql )įirst, specify a name for the view. It means you cannot use INSERT, DELETE, and UPDATE statements to update data in the base tables through the view.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |