Common Algorithm Concerns
When we build software, many of us use the same algorithms to solve problems. We might choose a similar method for a quicksort or a lambda validation or a regular expression. For database work, your code for a running total (or other common challenge) is likely very similar to many other people. At least on the same platform. You might solve this differently in SQL Server and Oracle, but for the same type of database, many of us write very similar code. Actually, for many developers, they copy and paste an answer from SQL Server Central, Stack Overflow, or another site. I'm not sure if I think this is good or bad, as it's a good idea to reuse code if it solves the same problem. If you copy it and don't test it, that's bad. After all, the code might not solve your slightly different problem if you don't check it. Read the rest of Common Algorithm Concerns