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tell application "TextEdit" make new document set the text of the front document to "Latest Report" & return & "Here is the latest news from the front" & return & "Sales have doubled!" tell the front document tell the first paragraph set the font to "Arial Bold" set the size to 18 end tell tell the second paragraph set the font to "Arial" set the size to 12 end tell end tell set the bounds of the front window to {800, 22, 1400, 822} end tell

Trigonometric Method Using trigonometry, you can determine the RC phase angle more precisely than the pictorial method allows Given the values of X C and R, the RC phase angle is the arctangent of their ratio Phase angle in RC circuits is symbolized by the lowercase Greek letter , just as it is in RL circuits Here are the formulas:

Internally, PRIMARY KEYS and UNIQUE constraints are actually hybrid objects they re constraints, but physically they re implemented internally by creating a unique index. The syntax for creating a PRIMARY KEY or UNIQUE constraint includes several of the different settings for an index, such as whether the index to create is clustered, what partition to place it on, and so on. Semantically, the distinction between a unique index and a constraint should be considered as part of your design. A constraint declares that some factor must be true, and for key constraints, this is declaring that the values in the selected columns must be unique. An index is a physical construct used specifically to speed up some operation; in this case, SQL Server is applying a unique index to speed up checking for duplicate values. I generally think of an index as something that can be created or dropped by the production staff without helping or harming anything other than performance.

dictionary viewer window to find the information about the save verb As you can see in Figure 3-10, save takes an optional as parameter to specify which file type to use and an optional in parameter to specify the filename (and the folder path)

As mentioned in the previous section, indexes are, in general, only to be used to improve performance, not for data protection. For SQL Server 2008, Microsoft has given us a WHERE clause on the CREATE INDEX syntax that also has data protection capabilities not found in UNIQUE constraints. If you want to protect for unique values except for when the value is some given value (most commonly, the use is unique values when not NULL), you can use a unique index with a WHERE clause. For example, if you have a table that holds persons, and you want to associate a unique customer number with the user if she becomes a customer, but not until, you could define an index such as the following:

= tan 1 (X C /R ) or = arctan (XC /R )

If you re using a previous version of SQL Server, there are other methods to use, such as an indexed view where you define the view to exclude data like you did with the WHERE clause on the CREATE INDEX statement. Then you add a clustered unique index on the view. Either method is acceptable, and implements the same sort of constructs with the same overhead.

Figure 3-10 The TextEdit dictionary shows that the save verb takes two parameters, both of which are optional

A foreign key constraint is used to make sure that columns involved in a relationship contain only correct data. I started out the chapter with an example that contained a foreign key reference. The reason for this is because it s probably the most frustrating of errors; it s rarely a problem in most databases, so it s not the first thing that will pop to mind. For example, say you have an invoice table and a table to represent what s on the invoice. The keys for these tables might look like the following: