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Reprinted from: http://blog.csdn.net/sunrise918/article/details/5575054These days on the logical primary key, business primary key and composite primary key have some thinking, also searched the related discussion on the net, related discussion can see the bottom reference link. Here are some of your own SQL Server-based summaries, other databases (Oracle, MySQL, DB2 、...... Should be similar, too. This is only a moment of their own thinking, if there

the way to the rush and constant test. By this story and friends to share the blue growth process. I do not know when the blue has a kind of can't say the obsession. Obsessed with its breadth, obsession with its depth, obsessed with being near but unreachable. and it's unclear from when, staring at Oracle's red glare, illuminating a light in front of you. Unknown and confused at their feet at the beginning of a little bit of life of enrichment and youth feedback. step forward on the path to

and system functions to users, so that users' thinking can be converted to "when I use this system in the future, what other defects does he have? Is there a better implementation method?" Instead of "What functions should the system have in the future? How should this function be implemented ?". However, we are also faced with such confusions that the system is built to meet the special needs of users, due to technical defects in development, the requirement investigator cannot quickly constru

not care about the external disputes or even create disputes, you cannot lose credibility. Otherwise, you are not a businessman but a liar; credibility details include: if you have an appointment with someone else at, you are not allowed to appear before or after. In the case of a traffic jam or an accident, you must notify the other party in time, unless you are in a car accident or are unconscious or dead, you have no reason to make an appointment, arrive too early, or be late too late, your

Introduction The data access layer, described in the first section of this tutorial, is a clear distinction between presentation logic and data access logic, as in the case of Layer, the following referred to as DAL. However, even if the DAL separates the details of data access from the presentation layer, it cannot handle any business rules. For example, we may not want the "category number" or "vendor number" of products in the product table that a

"A small company is more like a guerrilla--albeit with a clear goal, not for success, but for survival," said the entrepreneur. Entrepreneurs from big companies need to understand the limitations and unique advantages of the "Regular Army". From McKinsey to the business card network, it's a huge challenge for me. The former is a big company, I am like sitting in the passenger seat of a luxury car, now the business