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Is it safe to assume a GUID will always be unique?

I know there is a minute possibility of a clash but if I generated a batch of 1000 GUIDs (for example), would it be safe to assume they're all unique to save testing each one? ...
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Determine if ActiveRecord Object is New

How can I check if an ActiveRecord object is new or is already persisted? 2 Answers ...
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Difference between Role and GrantedAuthority in Spring Security

There are concepts and implementations in Spring Security, such as the GrantedAuthority interface to get an authority to authorize/control an access. ...
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How do you test running time of VBA code?

Is there code in VBA I can wrap a function with that will let me know the time it took to run, so that I can compare the different running times of functions? ...
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How do I go straight to template, in Django's urls.py?

Instead of going to views.py, I want it to go to to a template, robots.txt. 2 Answers ...
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How do I recover/resynchronise after someone pushes a rebase or a reset to a published branch?

We have all heard that one should never rebase published work, that it’s dangerous, etc. However, I have not seen any recipes posted for how to deal with the situation in case a rebase is published. ...
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Should I use @EJB or @Inject

I have found this question: What is the difference between @Inject and @EJB but I did not get any wiser. I have not done Java EE before nor do I have experience with dependency injection so I do not understand what I should use? ...
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INSERT INTO … SELECT FROM … ON DUPLICATE KEY UPDATE

I'm doing an insert query where most of many columns would need to be updated to the new values if a unique key already existed. It goes something like this: ...
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I need to get all the cookies from the browser

I need to get all the cookies stored in my browser using JavaScript. How can it be done? 9 Answers ...
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Callback of .animate() gets called twice jquery

Since I added some scrollTop -animation, some parts of my callback get called twice: 2 Answers ...