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generations, for example. But claiming that it s really hard to figure out the set-based way to handle this problem is not a legitimate reason to write a cursor. Unfortunately, cursors are sometimes written because the database design is so horrid that set-based code is nearly impossible. The key point concerning cursors and database design is that a well-normalized database schema will encourage set-based queries, whereas a denormalized (or never normalized) database schema will discourage set-based code. That s one more reason to normalize that database schema.

The tell-tale number on the Mail icon on the Dock shows the total number of new messages without separating them out into what s hot and what s not To find out the number of new messages in only one account, or in only some accounts, create a script that returns the unread count property of the appropriate mailbox object Follow these steps to create this script:

If you like to keep things simple, but not too simple, then buy stocks when the line is moving up (also referred to as an uptrend) or sell stocks when the line is moving down (also referred to as a downtrend) People have made fortunes following this uncomplicated but reliable strategy of following the market trend You might wonder why you need other indicators, since the market itself tells you so much In fact, many people believe that everything you need to know about a stock is found in the chart And for some people, this is as far as they go, and that s fine Nevertheless, if you want to gain more insights into the market, you ll want to add indicators to this chart Then you ll see for yourself how interesting the stock market can get Note: In all of the charts in this book, line charts are used because they are so easy to read But in the real trading environment, you ll probably want to use candlestick charts because they give more detailed information

Don t make every string column VARCHAR(255). Don t make every column that holds money values MONEY. You wouldn t serve pigs from a teacup, nor would you serve tea from a pig s trough. Use the right-sized data type; this is the first line of defense in ensuring the integrity of your data. It is amazing how many databases use VARCHAR(255) when the front-end application only allows 30 characters and report definitions only allow 20.

1 In AppleScript Editor, press z-N or choose File | New to create a new script 2 Start a tell block to Mail, addressing it by its application id:

Obfuscated database schemas are another real pain, and they serve no purpose. J12K98D is not a reasonable table name.

Speaking of divergence, if the market moves down but the MACD line moves up, this could be a signal to buy And if the market moves up but the MACD line moves down, this could be a signal to sell Many traders believe that these kinds of divergences give reliable signals There are also some nuances about MACD that you should know: If you use the crossings of the zero line by MACD as your main signal, then MACD will work best in a trending market However, if you use the crossings of the 9-period signal line as your main determinant, then MACD will probably do better in a neutral market that moves within large swings MACD signal line crossings will not work well in a narrow, neutral market, but changes in the direction of the MACD line itself will Although this can get a little confusing, keep in mind the indicator does have limitations Finally, some traders use MACD on multiple time frames and have three sets of charts: daily, weekly, and monthly Use the longer-term time periods to study long-term trends, and the shorter time periods to look for buy and sell signals (Note: A more detailed chart of MACD is in 12) If you re eager to learn more about MACD, then I m pleased to introduce my next guest, Gerald Appel, psychoanalyst, trader, and the creator of MACD He agreed to stop by and provide additional insights into how to best use his indicator and share some of the lessons he learned along the way