This is a list of what I have learned from my experience in the past, and I hope I do not make the same mistake in the future.
If you an Analyst,
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Do make a good documentation before development.
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A good documentation can make a fast development.
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A good documentation can make track every change while in development.
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A good documentation can make a programmer know about a problem with means they will know which algorithm or logic is the best that they will applied to the problem.
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If you a DBA,
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Do not change a field name in table occasionally.
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Changes in fields name impact to programmer time, and most programmer does not like it.
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If you really need to change a field name, make a new field but do not delete the old one, mark them as an absolute.
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Trigger is fast but trigger can make you triggered in the late of the night after it.
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Believe me with this one, Oracle suck! do not use it.
If you are a Programmer,
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Do read and learn. Don’t wasting others team with your stupid question, what you must do is: Googling.
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Read,
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Read,
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and Read!
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Then ask your friend, if you cannot solve the problem.
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Algorithm is cheap, time was expensive! Make or use a fastest algorithm as possible!
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Comment your code, please.