...g in SQL. Double quotes generally aren't used in SQL, but that can vary from database to database. Stick to using single quotes. That's the primary use anyway. You can use single quotes for a column alias — where you want the column name you reference in your application code to be something ot...

A fairly common requirement in database applications is to track changes to one or more specific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can wri...

... Here are all the Rails 4 (ActiveRecord migration) datatypes: :binary :boolean :date :datetime :decimal :float :integer :bigint :primary_key :references :string :text :time :timestamp Source: http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/Sc...

I need to retrieve all rows from a table where 2 columns combined are all different. So I want all the sales that do not have any other sales that happened on the same day for the same price. The sales that are unique based on day and price will get updated to an active status. ...

I want to execute Linux shell commands with Maven. Here is what I tried: 5 Answers 5 ...

I have used hashlib (which replaces md5 in Python 2.6/3.0) and it worked fine if I opened a file and put its content in hashlib.md5() function. ...

I'm trying to customize the location of the user.config file. Currently it's stored with a hash and version number 4 Ans...

...of references, but C# doesn't. Is there a special reason? Why I can't do something like: 4 Answers ...

I run this snippet twice, in the Ubuntu terminal (encoding set to utf-8), once with ./test.py and then with ./test.py >out.txt : ...

... Use EscapeDataString always (for more info about why, see Livven's answer below) Edit: removed dead link to how the two differ on encoding share | improve ...