asp.net data matrix reader

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A relation consists of rows, each of which represents an instance of the entity type, and of columns, each of which represents one of the attributes of the entity type Each row of a relation is called a tuple Practitioners use the word row more often than tuple, but a tuple is a row of a table, an instance of a relation, an instance of an entity type Each tuple consists of the values of the attributes for that instance of the entity type Another word for attribute is field So, in discussions of relational databases, you must keep in mind these synonyms: relation and table, tuple and row, attribute and field The first step is to create a relation for each strong entity in the data model Each of the attributes of the entity type in the data model will become a column name in the relation.

CHAP. 11]

for (it = tree.new InOrder(); it.hasNext(); ) { System.out.print(it.next() + " "); } System.out.print("\nPostOrder Traversal: "); for (it = tree.new PostOrder(); it.hasNext(); ) { System.out.print(it.next() + " "); } System.out.print("\nLevelOrder Traversal: "); for (it = tree.new LevelOrder(); it.hasNext(); ) { System.out.print(it.next() + " "); } System.out.println();

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At this time one must choose an attribute, or set of attributes, called a primary key, which will uniquely identify each row of the relation The ideal key is short, numeric, and never-changing The ideal is not always possible to achieve, but it can be helpful to keep the ideal in mind when choosing a key For instance, if the Student table includes the attributes of name, address, and social security number (SSN), in addition to other attributes, one could probably choose the combination name address, or the single attribute SSN, to uniquely identify students Choosing SSN would be wiser, because SSN will be more efficient to process, due to its numeric type, and it will change even less frequently than a name or an address Sometimes there is no obviously good key attribute among the attributes of the table.

19 20 21 22 23 24 25 26 27 28 29 30 31 32

The output is:

One choice is to concatenate the values of several fields to achieve an identifier that will be unique for each row If this approach leads to long, alphanumeric keys, it can be better to use a surrogate key A surrogate key is simply a number, generated by the DBMS, which is assigned to each tuple In the case of the Student table, if SSN were not one of the attributes to be stored for each student, one might decide to generate a surrogate key for the Student table and call it StudentID The second step is to create a relation for each weak and ID-dependent entity type As with strong entities, each attribute of the entity type in the data model becomes a column in the new relation.

tree = [A, B, D, G, E, C, PreOrder Traversal: A B InOrder Traversal: D G PostOrder Traversal: G D LevelOrder Traversal: A B F, H, D G E B E A E B H C D E I] C F H F I F F G H I C H I C A I

The following algorithm shows how a forest can be represented by a single binary tree. Algorithm 11.8 The Natural Mapping of a Forest into a Binary Tree 1. Map the root of the first tree into the root of the binary tree. 2. If node X maps into X' and node Y is the first child of X, then map Y into the left child of X'. 3. If node X maps into X' and node Z is the sibling of X, then map Z into the right child of X'. The roots of the trees themselves are considered siblings.

In addition, one must add a column to the weak or ID-dependent relation that will hold the foreign key of the strong entity tuple to which it is related A foreign key is a column in a relation, which establishes a relationship with data in another relation For instance, suppose our data model includes entity type StudentComputer , and that StudentComputer is a weak entity associated with Student That is, the database will track the information about each student s computer only as long as the student is part of the database In addition to attributes of the student s computer such as make and serial number, the StudentComputer relation will have a column identifying the student who owns the computer If SSN is the key of the Student relation, the foreign key in the StudentComputer relation will contain values of student social security numbers.

Figure 11.24 is the mapping of the forest shown in Example 11.25. For example, in the original forest, C has oldest child F and next sibling D. In the corresponding binary tree, C has left child F and right child D.

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