asp.net c# qr code generator Inside Microsoft SQL Server 2008: T-SQL Querying in Visual C#

Encoding QR-Code in Visual C# Inside Microsoft SQL Server 2008: T-SQL Querying

Inside Microsoft SQL Server 2008: T-SQL Querying
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TABLE 2-1
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Expressions and Possible Meanings in Different Contexts
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Possible Meaning
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The application of the function c to the argument a+b The product of the numbers c and a+b The reciprocal of A: b = 1/A The inverse function of A: if A(x) = y, b satis es the equation b(y) = x The product of i and y An imaginary number
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Expression
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c(a+b) c(a+b) b = A 1 b= iy iy A 1
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A Context for This Meaning
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The symbol c has been de ned as a function. The symbol c has been de ned as a number. The symbol A represents a number. The symbol A represents a function. The symbol i was de ned as an integer. The surrounding discussion is about complex numbers.
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It s possible to de ne a system of notation far less dependent on context than the familiar language of mathematics. Such a system would be cumbersome to learn and use, however, because reusing symbols to mean different things in different contexts provides economy and convenience.
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Dates
The importance of context is not restricted to the interpretation of expressions. The interpretation of individual literal values can depend on context as well. The concept of a calendar date is a good example of this. There s no one right way to denote calendar dates, but to communicate, we have to denote them. A character string that represents a speci c value is called a literal. Table 2-2 presents some literal date values and the meanings they would have in some of SQL Server s supported languages.
TABLE 2-2
Date Literals with Culture-Dependent Meanings
Possible meaning
The 3rd day of the 11th month of the year 2008 The The 3rd day of the 10 th month of the year 2008 month of the year 2009 The 12th day of the 13th month of the year 2009 13th day of the 12th The 9th day of the 12th month of the year 2013
Date literal
3 listopad 2008 3 listopad 2008 13-12-09 13-12-09 13-12-09
A language where this is the meaning
Polish Croatian US English German Swedish
Depending on the server s two-year date cutoff setting, which provides yet additional context for the interpretation of dates, the date literal string 13-12-09 could be interpreted with the year 1909 or 1913, depending on language. Fortunately, you can specify dates in culture-independent ways, and one that works well for SQL Server is the string YYYYMMDD. (In code, be sure to surround it with quotes, as in 20071112 , so that it isn t interpreted as an integer!)
2
Set Theory and Predicate Logic
Alphabetical Order
Later in this chapter, I ll discuss the notion of order in more detail. At this point, I ll simply mention that alphabetical order is another notion that depends on context. In a Spanish dictionary from the early twentieth century, you ll nd the word llama after the word lobo because Spanish traditionally considered the word llama to begin with the letter (yes, letter, not letters) ll, which comes after the letter l. In an English dictionary, llama begins with l; thus, llama appears before lobo.
Functions, Parameters, and Variables
I ll assume you re familiar with the language of mathematical functions, such as f(x)=x2, and I ll address any tricky concepts when they arise. The word parameter is worth a few remarks. This term may mean a number of things: in the function de nition f(x) = x2, x is a placeholder (or more precisely, a formal parameter or free variable). If we apply the de nition of the same function and write f(9) = 81, the number 9 is also called a parameter (an actual parameter). Roughly speaking, a parameter is a placeholder for a value, a value that lls such a placeholder, or a value that might be a different value. In this chapter, the term parameter will mean formal parameter or placeholder. Ideally, for every parameter in an expression, a well-de ned set of values can be substituted in its place. This set is called the parameter s domain. If the domain of x in the expression f(x) = x2 is the set of real numbers, we can also call x a real-valued parameter. An expression with a parameter, such as x2, is called a parameterized expression. Note Parameter domains often go unstated. They may be implied by conventions mathematicians
follow when they choose symbols and names: the names x, y, s, and t are typically used for real-valued parameters; z, and sometimes w, are good choices for complex-valued parameters; p, q, and r are typical rational-valued parameter names; and letters near the middle of the alphabet, including i, j, k, m, and n, more often than not represent integer-valued parameters. In programming languages, domains correspond to types, and parameters correspond to variables. In T-SQL, a variable s type must be speci ed.
To set the stage for what comes later, consider the real-valued parameter x in the parameterized, real-valued expression x2. Despite being named real valued, neither x nor x2 has any value at all, at least not until x is speci ed. If we supply a value for example, 3 for x, the expression x2 then has a value, which in this case is 9. Supplying the value 3 for the parameter x is informally called plugging 3 in for x or, formally, binding x to the value 3. We can be sure an expression represents a speci c value when all of its parameters have been bound.
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