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Creating a joined view

From: MySQL Essential Training

Video: Creating a joined view

A view can be a simple straight query or it can be a more complex joined query. As, and there's my query.

Creating a joined view

A view can be a simple straight query or it can be a more complex joined query. The technique is the same. For this lesson, we will be using the album database. And I want to start with a query that shows all the tracks for each album with the duration as minutes and seconds. I'm just going to go ahead and copy and paste this out of the exercise files here. And grab it here starting at line 75. And I'll copy that and paste it into SID and press go.

And so you see we have a simple joined query with artist, album, track, track number, minutes and seconds, like that. And, there's the query where we can look at it in the editor. And you can see it's a pretty straight forward joint query, we've covered all of this stuff already. Now if I find this query very, very useful, I can save this as a view. So I can just say CREATE VIEW, call it joinedAlbum. As, and there's my query.

And then I can come down here and I can say SELECT * FROM joinedAlbum like that. Press Go. And there is my exact same result, but this time the query is saved. As a view and so I can just do this again and do this again. And I get exactly the same result without having to have all of that code in there very time. In fact, because this is a view and the view is a select statement and a select statement can be used any way that you use a table.

I can just say SELECT FROM joinedAlbum WHERE artist equals Jimi Hendrix and say Go, and I get just the albums that are by the artist Jimi Hendrix. In fact, I can say SELECT artist, album, track, trackno, and I can do something like this. And by concatenating with separator the minutes and seconds padded to two places with a leading zero if necessary.

I can create the minutes and seconds as a duration, and so that it looks like minutes and seconds in normal time notation. There is a MySQL function for this. I believe it's called seconds to time. But it pads it out farther with hours, minutes and seconds and I don't really want that. I just want minutes and seconds and this is a pretty simple, way to do that and now with my view it makes it relatively easy. And in fact I can even incorporate this into the view if I wanted to.

So again when you're done with a view. You can just say DROP VIEW and the name of the view. And it doesn't delete the underlying tables, it just deletes the view. And so any select statement can be saved as a view. Views are a fairly standard feature across all systems and platforms. MySQL conforms to the SQL standard syntax for creating and dropping views.

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This video is part of

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MySQL Essential Training

60 video lessons · 7089 viewers

Bill Weinman
Author

 
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  1. 4m 22s
    1. Welcome
      1m 3s
    2. Using the exercise files
      1m 31s
    3. What is MySQL?
      1m 48s
  2. 45m 37s
    1. Installation overview
      3m 16s
    2. Installing XAMPP on Windows
      5m 55s
    3. Installing XAMPP on the Mac
      6m 38s
    4. Setting up MySQL users
      11m 31s
    5. Installing SID on Windows
      5m 43s
    6. Installing SID on the Mac
      6m 6s
    7. Installing time zone support in MySQL on Windows
      6m 28s
  3. 45m 43s
    1. The SELECT statement
      3m 57s
    2. Selecting rows
      4m 57s
    3. Selecting columns
      3m 8s
    4. Sorting results with ORDER BY
      2m 58s
    5. Filtering results with WHERE
      3m 52s
    6. Filtering results with LIKE and IN
      3m 41s
    7. Filtering results with regular expressions
      8m 21s
    8. Inserting rows
      4m 9s
    9. Updating rows
      2m 21s
    10. Deleting rows
      2m 25s
    11. Literal strings
      3m 12s
    12. Understanding NULL
      2m 42s
  4. 41m 47s
    1. Creating a database
      4m 30s
    2. Creating a table
      7m 18s
    3. Creating indexes
      6m 8s
    4. Controlling column behavior with constraints
      4m 46s
    5. Creating an ID column
      6m 58s
    6. Using foreign key constraints
      7m 58s
    7. Altering a table
      4m 9s
  5. 28m 56s
    1. What are data types?
      4m 1s
    2. Numeric types
      5m 21s
    3. String types
      2m 58s
    4. Date and time types
      7m 2s
    5. Bit type
      2m 26s
    6. Boolean values
      2m 15s
    7. Enumeration types
      4m 53s
  6. 32m 34s
    1. String functions
      6m 57s
    2. Numeric functions
      6m 2s
    3. Date and time functions
      4m 12s
    4. Time zones in MySQL
      3m 37s
    5. Formatting dates
      1m 51s
    6. Aggregate functions
      5m 45s
    7. Flow control with CASE
      4m 10s
  7. 7m 6s
    1. Maintaining database integrity with transactions
      4m 46s
    2. Using transactions for performance
      2m 20s
  8. 16m 49s
    1. Updating a table with a trigger
      5m 11s
    2. Preventing automatic updates with a trigger
      7m 29s
    3. Logging transactions with a trigger
      4m 9s
  9. 14m 11s
    1. Creating a simple subselect
      3m 23s
    2. Searching within a result set
      3m 53s
    3. Creating a view
      3m 32s
    4. Creating a joined view
      3m 23s
  10. 12m 26s
    1. Understanding MySQL stored routines
      2m 0s
    2. Creating a stored function
      4m 34s
    3. Creating a stored procedure
      5m 52s
  11. 14m 4s
    1. The multi-platform PDO interface
      3m 44s
    2. Executing the SQL
      4m 8s
    3. Implementing auto-increment IDs
      2m 3s
    4. Using a stored funciton
      4m 9s
  12. 1m 3s
    1. Goodbye
      1m 3s

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