Literals have caused me grief on more than one occasion. Trying to figure out what a certain number or character literal means in a program has wasted too much of my time, and my time is more valuable to me than money. I have written about this topic before, but I have not talked about literals in SQL.
The example I've chosen may not be the best one, since the ratio of pounds to kilograms never changes. I chose it because it's one most people should be able to relate to. The article I just referred to covers the arguments for and against unchanging literals, so I won't rehash them here.
Suppose we work for a factory in the United States that ships products to other countries. The factory uses customary American units of measurement, but documents that go to other countries require metric measurements.
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