how to make qr code generator in vb.net Inside Microsoft SQL Server 2008: T-SQL Programming in .NET

Draw QR Code 2d barcode in .NET Inside Microsoft SQL Server 2008: T-SQL Programming

Inside Microsoft SQL Server 2008: T-SQL Programming
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Timestamped Predicates and Propositions
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In a table with temporal support, the header represents a predicate with at least one time parameter that represents when the rest of the predicate is valid the complete predicate is therefore a timestamped predicate . Rows represent timestamped propositions, and the row s valid time period is expressed with one of two attributes: since (for semitemporal data) or during (for fully temporal data); the latter attribute is usually represented with two values, from and to . I will explain these attributes in an example from the InsideTSQL2008 database . Figure 12-1 shows the original and two additional timestamped versions of the Production . Suppliers table . The additional columns required for temporal support are in bold .
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Suppliers PK supplierid companyname contactname contacttitle address city region postalcode country phone fax PK Suppliers_Since supplierid companyname contactname contacttitle address city region postalcode country phone fax since Suppliers_From To PK supplierid companyname contactname contacttitle address city region postalcode country phone fax from to
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FiguRe 12-1 The original Suppliers table and two timestamped versions
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From the original table header, you can read a predicate saying that a supplier with identification supplierid, named companyname, having contact contactname, and so on is currently our supplier, or is currently under contract . The Suppliers_Since table header has this predicate modified with a time parameter: a supplier with the identification supplierid, named companyname, having contact contactname, and so on is under contract since some specific point in time . In the Suppliers_FromTo table, the header has this predicate modified with an even more specific time attribute: a supplier with ID supplierid, named companyname, having contact contactname, and so on is (or was, or will be, depending on the current time) under contract from some specific point in time to another point in time . This predicate can be shortened: a supplier with ID supplierid, named companyname, having contact contactname, and so on is (or was, or will be, depending on current time point) under contract during some interval of time . So far, everything seems quite simple . You add one or two columns, and you have temporal support . However, immediately a number of questions arise . As soon as you have represented validity time in the Suppliers table, you have to implement it on supplied products as well . Furthermore, a supplier can supply a product only at times when the supplier has a valid
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Temporal Support in the Relational Model
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contract . Without temporal support in the Suppliers table, you need only a foreign key on the SuppliersProducts table referencing the Suppliers table to implement the restriction that a supplied product must have a valid supplier . With temporal support in the Suppliers table, the restriction is stronger: the product s supplier must exist and be under contract for the entire period when the product is supplied . In addition, the time points that describe since and during have to be valid points in time . For example, there might be a requirement that no time points in a database can precede the time point when the company was established . Another problem is with the last table, the Suppliers_FromTo table . You might think that this one table is enough to represent all possible timestamped propositions . However, if you only have this table, how do you represent the current state, the current suppliers Current suppliers should include both suppliers with a valid open-ended contract and suppliers with a time-limited contract that includes the current time point . Some authors have suggested the use of a special marker NOW for the to attribute of open-ended contracts . This marker would be similar to the special NULL marker, which denotes unknown values, but the expression t = NOW would always return true when evaluated at time t . I do not think you can you represent both time-limited and open-ended propositions like is or will be a supplier since time point from , and was a supplier during the (closed) interval i respectively with this table . I will show that it is better to have separate tables for semitemporal and fully temporal data if you need to represent both kinds . Many more problems arise; I will explain them and solve them in this chapter .
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