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Containment Operators begin[s] with/start[s] with end[s] with contains does not contain/ doesn t contain is in is not in is contained by is not contained by/ isn t contained by is equal to Finds the specified item at the beginning of the target Finds the specified item at the end of the target Finds the specified item in the target Finds a target without the specified item Finds a target that matches one of the specified items Finds a target that doesn t match any of the specified items Checks whether an item is contained by another item Checks whether an item is not contained by another item You can also use =, equal, equals, or equal to AppleScript automatically changes any of the text variations to is equal to when you compile the script You can also use /=, does not equal, doesn t equal, or is not equal (without "to") AppleScript automatically changes /= to (the not-equal sign) and the text variations to is not equal to when you compile the script Returns true if the first item is the same as or equal to the second item; otherwise, returns false

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Are you a perfect speller Is everyone in your company How about your business partners Misspellings are a fact of life. There are also legitimate differences in spelling: what Americans call rumors, the British call rumours. Steven A. Ballmer and Steve Ballmer are two different but accurate forms of that man s name. Your database may contain a lot of legacy values from the days before better validation at the point of data entry. Overall, chances are your database already contains imperfect textual data, which makes it hard to search. Additionally, the user may not know exactly what to look for. When looking for a number or a date, we could search for a range, but text is more unstructured, so database engines such as SQL Server include a range of tools to find text, including the following:

Table 4-2

Equals and LIKE search for equality with or without wildcards. SOUNDEX uses a phonetic algorithm based on the sound of the consonants in a string. CONTAINS is opti-

Silicon Silicon (chemical symbol Si) is widely used in diodes, transistors, and integrated circuits Generally, other substances, or impurities, must be added to silicon to give it the desired properties The best quality silicon is obtained by growing crystals in a laboratory The silicon is then fabricated into wafers or chips Gallium Arsenide Another common semiconductor is the compound gallium arsenide Engineers and technicians call this material by its acronym-like chemical symbol, GaAs, pronounced gas If you hear about gasfets and gas ICs, you re hearing about gallium-arsenide technology GaAs devices require little voltage, and will function at higher frequencies than silicon devices because the charge carriers move faster through the semiconductor material GaAs devices are relatively immune to the effects of ionizing radiation such as X rays and gamma rays GaAs is used in light-emitting diodes (LEDs), infrared-emitting diodes (IREDs), laser diodes, visible-light and infrared (IR) detectors, ultra-high-frequency (UHF) amplifying devices, and a variety of integrated circuits Selenium Selenium exhibits conductivity that varies depending on the intensity of visible light or IR radiation that strikes it All semiconductor materials exhibit this property, known as photoconductivity, to some degree; but in selenium the effect is especially pronounced For this reason, selenium is useful for making photocells Selenium is also used in certain types of rectifiers A rectifier is a component or circuit that converts ac to pulsating dc A significant advantage of selenium is the fact that it is electrically rugged Selenium-based components can withstand brief transients, or spikes, of abnormally high voltage, better than components made with most other semiconductor materials Germanium Pure elemental germanium is a poor electrical conductor It becomes a semiconductor only when impurities are added Germanium was used extensively in the early years of semiconductor technology Some diodes and transistors still use it A germanium diode has a low voltage drop (03 V, compared with 06 V for silicon and 1 V for selenium) when it conducts, and this makes it useful in some situations But germanium is easily destroyed by heat Extreme care must be used when soldering the leads of a germanium component.

mized for finding inflectional forms and synonyms of strings. Simil is an algorithm that compares two strings, and based on the longest common substrings, computes a similarity between 0 (completely different) and 1 (identical). This is sometimes called fuzzy string matching. Simil isn t available by default. Later in this chapter we ll discuss how to install it. In this chapter, we take a closer look at these various methods, beginning with the simplest one.

AppleScript s Operators (continued)