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Sometimes a multivalued attribute is disguised as multiple attributes. For example, Figure 1-4 could be changed to have separate attributes (columns) for up to three languages per movie, called Language 1, Language 2, and Language 3. However, they would still be considered multivalued attributes but in a special form called a repeating group, which is also forbidden in rst normal form. A repeating group is logically no different than one multivalued attribute. In fact, repeating groups often present more maintenance problems than multivalued attributes because a column must be added whenever you want to add more values than the original designer anticipated (such as a fourth language for a movie). Relational databases expect all rows in a table to have the same number of columns, but you can have as many rows as you wish in a table. Therefore, the trick is to take repeating columns and repeating values within columns and turn them into repeating rows in another table, and this is exactly what the rst normal form process instructs you to do. To transform unnormalized relations into rst normal form, you must move multivalued attributes and repeating groups to new relations. Because a repeating group is a set of attributes that repeat together, all attributes in a repeating group should be moved to the same new relation. However, a multivalued attribute (individual attributes that have multiple values) should be moved into its own new relation rather than combined with other multivalued attributes in the new relation. asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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19 Apr 2005 ... NET 2005 - 7.40 Kb ... The EAN - 13 barcode is composed of 13 digits, which are made up of the following sections: the first 2 or 3 digits are the ... The procedure for moving a multivalued attribute or repeating group to a new relation is as follows: 1 Create a new relation with a meaningful name Often it makes sense to include all or part of the original relation s name in the new relation s name 2 Copy the unique identi er from the original relation to the new one The data depended on this identi er in the original relation, so it must depend on the same key in the new relation This copied identi er will become a foreign key in the new relation 3 Move the repeating group or multivalued attribute to the new relation (The word move is used because these attributes are removed from the original relation) 4 Form a unique identi er in the new relation by adding attributes to the unique identi er that was copied from the original relation. Dynamic SQL * user for a table name and two column names, and constructs an UPDATE statement for the table that looks like this: asp.net ean 13 .NET EAN 13 Generator for C#, ASP . NET , VB.NET | Generating ...
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NET Core Barcode is a cross-platform Portable Class Library that generates barcodes using barcode fonts. It supports Windows, macOS and Linux, and can be ... The user s input thus determines the table to be updated, the column to be updated, and the search condition to be used. The search comparison value and the updated data value are specified as parameters, to be supplied later when the UPDATE statement is actually executed. After building the UPDATE statement text in its buffer, the program asks the DBMS to compile it with the PREPARE statement. The program then enters a loop, prompting the user to enter pairs of parameter values to perform a sequence of table updates. This user dialog shows how you could use the program in Figure 18-4 to update the quotas for selected salespeople: As always, be certain that the newly formed unique identi er has only the minimum attributes needed to make it unique If you move a multivalued attribute, which is basically a repeating group of only one attribute, it is that attribute that is added in forming the unique identi er This will seem odd at rst, but the unique identi er copied from the original relation is not only a foreign key to the original relation, but also usually part of the unique identi er (primary key) in the new relation This is quite normal Also, it is perfectly acceptable to have a relation where all the attributes are part of the unique identi er (that is, there are no non-key attributes) 5 Optionally, you may choose to replace the primary key with a single surrogate key attribute. Enter name of table to be updated: staff Enter name of column to be searched: empl_num Enter name of column to be updated: quota Enter search value for empl_num: 106 Enter new value for quota: 150000.00 Another (y/n) y Enter search value for empl_num: 102 Enter new value for quota: 225000.00 Another (y/n) y Enter search value for empl_num: 107 Enter new value for quota: 215000.00 Another (y/n) n Updates complete. asp.net ean 13 EAN - 13 Barcode Generator for ASP . NET Web Application
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