SQL Server 2016 videos | SQL Server 2016 Pt 7 - Computed Columns

Posted by Andrew Gould on 10 November 2016


A computed column in a SQL Server table allows you to store an expression which calculates a new value based on the data in other columns of the same table. This video explains how to create computed columns and how to persist the result of the calculation so that it's stored in the table. You'll also learn a little about SQL Server's expression syntax, including how to use some of its built-in functions, the difference between deterministic and non-deterministic functions, how to use Case expressions to test conditions and how to concatenate strings. We'll do this by building a few example computed columns including constructing a full name from first and last name columns, calculating age in days using the DateDiff function and calculating age in years using DateDiff, DateAdd and a Case expression.

See our full range of SQL training resources, or test your knowledge of SQL with one of our SQL skills assessment tests.

This video has the following accompanying files:

File name Type Description
CreatePeople.sql SQL query
End - CreatePeople.sql SQL query

Click to download a zipped copy of the above files.

There are no exercises for this video.

Making a  video bigger

You can increase the size of your video to make it fill the screen like this:

View full screen

Play your video (the icons shown won't appear until you do), then click on the full screen icon which appears as shown at its bottom right-hand corner.

 

When you've finished viewing a video in full screen mode, just press the Esc key to return to normal view.

Improving the quality of a video

To improve the quality of a video, first click on the Settings icon:

Settings icon

Make sure you're playing your video so that the icons shown appear, then click on this gear icon at the bottom right-hand corner.

 

Choose to change the video quality:

Video quality

Click on Quality as shown to bring up the submenu.

 

The higher the number you choose, the better will be your video quality (but the slower the connection speed):

Connection speed

Don't choose the HD option unless you have a fast enough connection speed to support it!

 

Is your Wise Owl speaking too slowly (or too quickly)?  You can also use the Settings menu above to change your playback speed.

This page has 0 threads Add post