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I've already been doing this job, just for someone else.
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As a programmer who had never worked in an on-call role, I had to fudge my way around this, as I really didn't know how I would feel having to work a production issue at 2:30 in the morning. I said I would do whatever the job required. Less
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The ER was simple, don't forget primary and foreign keys. The query was a pretty simple inner join. The answer to the triangle one is that are the people all moving in the same speed? Because if it's a constant speed then they will never collide. The answer to the sock one is 3 times. Because if you pick 1 sock it might be green. The next pick might be blue. The 3rd pick will guarantee you have a matching pair. Less
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I used the STAR method.