Join Bill Weinman for an in-depth discussion in this video Using transactions, part of SQL Essential Training.
…The syntax for using transactions in SQL is pretty simple.…In this lesson, I'll demonstrate two common uses for transactions.…First I'll show you how to maintain the integrity of your database…by ensuring that related statements are…completed successfully, before they're committed to storage.…Going to be using the test.db database here, for this lesson.…And to start with, I'm going to copy and…paste some SQL from the exercise files for Chapter 8.…I'm going to create a couple of tables, and…insert some data into them to start with.…
So I'm pressing Cmd+C on my Mac, you use Ctrl+C on a PC, and then I paste it into…SID, into the SQL box using Cmd+V or Ctrl+V and there's…the tables and you see we've created a inventory table and a Sales table.…And then, we've inserted some rows into the Inventory table.…And select asterisk from widget inventory: and there's the result.…Now, I'm just going to select all of this, and delete it.…
And, we'll go back to the exercise file here, and, I'm going to grab this part…from begin transaction to the select from inventory…
- 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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