Join Bill Weinman for an in-depth discussion in this video Searching within a result set, part of SQL Essential Training.
…In this lesson I'll show you a practical example of using a…sub-select to provide a list of rows to search for in a table.…I'm going to be using the album.db database for this.…And I'm going to start with just a simple select statement.…Suppose you want a list of albums that have…tracks with a duration of 90 seconds or less.…You can start with looking for the album ID in the…track table where the duration is less than or equal to 90.…So that would look like this.…And now we have a small list of album ID's.…
Now, there's only two of them.…That's because there's really only two tracks in our…database that have less than 90 seconds of duration.…There might have been more, and there…might have been some with duplicate album ID's.…So we can make this a select distinct.…We'll get the same result here, but that would be…the correct way to do it, so we'll use that.…Now we want to do is to select from the…album table, just the albums that match these album ID's.…So that would look something like this.…And then we would put our sub-select in there like that.…
- Understanding SQL terminology and syntax
- Creating new tables and records
- Inserting and updating data
- Writing basic SQL queries
- Sorting and filtering
- Accessing related tables with JOIN
- Working with strings
- Finding the numeric type of a value
- Using aggregate functions and transactions
- Updating a table with triggers
- Creating views
Skill Level Beginner
Q: For Mac OS X: When I try to start the Apache Web Server from the XAMPP control panel, it doesn't start, and when I open "localhost" in my web browser, I see a white screen that says "It Works!" instead of the XAMPP page.
sudo apachectl stop
Q: I'm on a Mac, and I get an error in SID that says "attempt to write a read only database." How can I fix this?
A: This usually means that the database folder does not have sufficient permissions for writing by the web user. This can happen if you create the SQL folder new, rather than copying it from the Exercise Files. Here's how to fix this:
- Open a Finder window and Navigate to /Applications/XAMPP/htdocs/SQL
- Control-click on the SQL folder and select "Get Info" from the context menu.
- Under "Sharing and Permissions" (you may need to open the disclosure triangle), in the "everyone" row, select "Read & Write."Then you can close the Info window.
- Now repeat the process for the three *.db files inside the folder.
1. SQL Quick Start
Understanding joins2m 23s
Dates and times1m 59s
10. Subselects and Views
11. A Simple CRUD Application
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