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Along the Line Extreme voltage is good for high-tension power transmission, but it s certainly of no use to an average consumer The wiring in a high-tension system must be done using precautions to prevent arcing (sparking) and short circuits Personnel must be kept at least several meters away from the wires Can you imagine trying to use an appliance, say a home computer, by plugging it into a 500,000-V rms electrical outlet Medium-voltage power lines branch out from the major lines, and step-down transformers are used at the branch points These lines fan out to still lower-voltage lines, and step-down transformers are employed at these points, too Each transformer must have windings heavy enough to withstand the product P = EI, the amount of VA power delivered to all the subscribers served by that transformer, at periods of peak demand Sometimes, such as during a heat wave, the demand for electricity rises above the normal peak level This loads down the circuit to the point that the voltage drops several percent This is called a brownout If consumption rises further still, a dangerous current load is placed on one or more intermediate power transformers Circuit breakers in the transformers protect them from destruction by opening the circuit Then there is a temporary blackout At individual homes and buildings, transformers step the voltage down to either 234 V rms or 117 V rms Usually, 234-V rms electricity is provided in the form of three sine waves, called phases, each separated by 120 , and each appearing at one of the three slots in the outlet (Fig 18-9A) This voltage is commonly employed with heavy appliances, such as the kitchen oven/stove (if they are electric), heating (if it is electric), and the laundry washer and dryer A 117-V rms outlet supplies just one phase, appearing between two of the three slots in the outlet The third opening in the outlet leads to an earth ground (Fig 18-9B) In Electronic Devices The smallest power transformers are found in electronic equipment such as television sets, ham radios, and home computers Most solid-state devices use low voltages, ranging from about 5 V up to perhaps 50 V This equipment needs step-down power transformers in its power supplies Solid-state equipment usually (but not always) consumes relatively little power, so the transformers are usually not very bulky The exception is high-powered AF or RF amplifiers, whose tran-.

A major goal of the new Transact-SQL (T-SQL) features in SQL Server 2008 is to reduce the amount of code you need to write for common scenarios. Many new language features simplify code, and table-valued parameters probably do so most dramatically. Such an innocuous name for a radical new feature! It s the sort of thing that only a geek could love: the ability to pass a table to a procedure. It s a simple enhancement but will change the way you think about programming SQL Server forever. If you ve ever passed a comma or other delimited list of data values to a stored procedure, then split them up, and processed them, or bumped up against stored procedure parameter limits, you know the pain that is now forever gone. In this chapter I ll explore the syntax and use of this new T-SQL feature, both in SQL Server code as well as client code. By the end of the chapter, you ll wonder how you ever programmed without it!

Figure 16-1

Before SQL Server 2008, there was no easy way to pass data containers arrays, DataSets, DataTables, and so on to stored procedures and functions. You could pass single scalar values with no problem, although if you had to pass many parameters you might run into the limit on parameters, which is 2,100. Objects like arrays, in-memory tables, and other constructs are not the kind of set-based objects that T-SQL deals with. Yet sometimes it is necessary to pass data containers to a code module. Over the years, the ever-resourceful SQL Server community has devised plenty of ways to get around this problem. Some of the more common workarounds have included the following: Pass in a delimited string, and parse it using T-SQL s less-than-robust stringhandling features. Pass data to the procedure as XML and shred it into a relational form.

Create long parameter lists with plenty of optional parameters to accommodate varying needs. Create a global temporary table or even a permanent Parameters table to store lists of parameter data, which is often linked to a particular user connection. The problem has plenty of other creative solutions. Unfortunately, making these solutions work requires either convoluted code or a shared resource or both, thereby creating maintenance nightmares. Another kind of problem with T-SQL s inability to pass a data container as a parameter occurs when you pass data from a client application to be stored or processed in SQL Server. The canonical problem of this type is creating a new customer order along with one or more order line items. The overall workflow between client application and database server goes something like this: Pass the order header information, including customer ID, order date, and other order details. Get the new order ID back (normally the primary key of the Order table), then make multiple calls to an InsertOrderDetail stored procedure to insert each order detail line item s data. Because there has been no easy way to encapsulate all this in a single call to the database server, the application has a chatty relationship with the server, causing many round trips and creating a fragile situation. You had to be careful with transactions, because whenever so much data was flowing back and forth between the application server and the database server, too many things could go wrong. In addition, it s never a good idea to leave data fragments lying around a database.

The Put/Call Ratio tracks the volume of put and call options that trade on the Chicago Board Options Exchange (CBOE) Specifically, the idea is that option put buyers, who are aggressively bearish, are frequently wrong And option call buyers, who are aggressively

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Table-valued parameters to the rescue!