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Louis Davidson has more than 15 years of experience as a corporate database developer and architect. Currently he s the data architect for the Christian Broadcasting Network. Nearly all of Louis s professional experience has been with Microsoft SQL Server, from the early days to the latest version he can get access to legitimately. Louis has been the principal author of four editions of a book on database design, including one for SQL Server 2008 entitled Pro SQL Server 2008 Relational Database Design and Implementation (Apress, 2008). Louis s primary areas of interest are database architecture and coding in T-SQL; he s had experience designing many databases and writing thousands of stored procedures and triggers through the years.

A simplified drawing of an NPN bipolar transistor is shown in Fig 22-1A, and the schematic symbol is shown in Fig 22-1B The P-type, or center, layer is called the base One of the N-type semiconductor layers is the emitter, and the other is the collector Sometimes these are labeled B, E, and C in schematic diagrams A PNP bipolar transistor has two P-type layers, one on either side of a thin N-type layer (Fig 22-2A) The schematic symbol is shown in Fig 2-22B It s easy to tell whether a bipolar transistor in a diagram is NPN or PNP If the device is NPN, the arrow at the emitter points outward If the device is PNP, the arrow at the emitter points inward Generally, PNP and NPN transistors can perform the same functions The differences are the polarities of the voltages and the directions of the resulting currents In most applications, an NPN device can be replaced with a PNP device or vice versa, the power-supply polarity can be reversed, and the circuit will work in the same way as long as the new device has the appropriate specifications

Calculating with integers is easy enough, but you ll have noticed that the month property doesn t return an integer between 1 and 12: Instead, it returns a month class that contains a month constant, such as June for the month of June Each month constant has a corresponding integer value, so you can perform arithmetic with the month constants For example, if you subtract a date that returns the month constant February from a date that returns the month constant June, as in the following example, you get 4, the number of months between February and June

Some people will tell you that properly normalizing your tables is hard. It s not. The normalization rules are clear, and once you know all the functional dependencies in your data, you merely have to follow the rules carefully, taking care not to forget anything, and you ll always end up with a properly normalized design. The hard part comes before you can start normalizing when you try to find all the functional dependencies. Considering how exact and well laid down the rules of normalization are, it s surprising to find that there are no similar rules for finding the functional dependencies. For what use is a set of rules that guarantees a correct model from a correct set of functional dependencies if there s no way to find that correct set of functional dependencies In this chapter, I ll present a method to find all the functional dependencies. The only thing left for you to do is to find a domain expert who s willing to answer your questions.

Communication between domain experts and data modelers can be prone to misunderstandings. Once the interview gets beyond the basics, the domain expert can go into details that are far too advanced and complicated for the data modeler to understand, unless he s a domain expert himself. And questions asked by the data modeler are often so abstract that the domain expert might misunderstand them, unless she has lots of experience with data modeling herself. To minimize the chance of misunderstandings, I use a technique that s not used often in interviews, but has proven its worth many times: I use concrete examples (preferably in a notation familiar to the domain expert) instead of asking abstract questions. To illustrate the benefits of this interview technique, let s briefly assume that you, as a domain expert in the field of relational databases, are being interviewed by

set month1 to month of date "Monday, February 22, 2010 12:00:00 AM" set month2 to month of date "Thursday, June 24, 2010 12:00:00 AM" set monthDiff to month2 - month1

of an NPN transistor At B, the schematic symbol Electrodes are E = emitter, B = base, and C = collector

using (SqlCeCommand cmd = new SqlCeCommand("Customers", cnn)) { cmd.CommandType = CommandType.TableDirect; cmd.IndexName = "IDX_CustName"; cmd.SetRange(DbRangeOptions.Prefix, new object[] { "F" }, null);

using (SqlCeResultSet rs = cmd.ExecuteResultSet(ResultSetOptions.Sensitive)) { while (rs.Read())