Access database design & programming: [what you really need by PhD Steven Roman

By PhD Steven Roman

Whereas specified at intermediate Microsoft entry clients who're beginner programmers, this moment version of the bestselling entry Database layout & Programming may still attract all degrees of entry builders. specifically, the recent version includes:

    A dialogue of entry' new VBA built-in improvement setting utilized by note, Excel, and PowerPoint

    Expanded insurance of the VBA language itself, in line with reader requests

    Discussions of Microsoft's most up-to-date information entry expertise, known as lively facts gadgets (or ADO), and Open Database Connectivity (ODBC), that's in detail attached with ADO

For amateur programmers, this e-book makes a speciality of more often than not ignored, yet however crucial, wisdom for constructing potent database functions. Its therapy of database layout and queries provides intermediate and complex builders a consolidated resource of details, whereas its programming chapters represent a convenient connection with simple operations that may be played utilizing DAO or the entry item version.

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Fortunately, Access allows the user to write SQL statements. Let us recall some notation used earlier in the book. ,An ). 1 Renaming Renaming refers simply to changing the name of an attribute of a table. 5. 5. 2 Union If S and T are tables with the same attributes, then we may form the union S is just the table obtained by including all of the rows from both S and T. 1 Example A1 A2 a c b d e f A1 A2 g h i j A1 A2 a b c e g d f h i j Note that if S and T do not have the same attributes, but do have the same degree—that is, the same number of columns, then we can first rename the attributes of one table to match the other, and then take their union.

2 shows two tables S and T based on these table schemes. Suppose also that {A2 } is a key for table scheme S (the one side of the relationship). Then we add this attribute to the table scheme T (and hence to table T). In this way, for any row of the table T, we can identify the unique row in table S to which it is related. 2. A one-to-many relationship shown in tables S and T The attribute set {A2 } in table S is a key for the table scheme S. For this reason, the attribute set {A2 } is also called a foreign key for the table scheme T.

3 First Normal Form First normal form is very simple. A table scheme is said to be in first normal form if the attribute values are indivisible. To illustrate, we considered in Chapter 1 the question of including all the authors of a book in a single attribute, called Authors. Here is an example entity: ISBN = 0-55-123456-9 Title = Main Street Authors = Jones, H. and Smith, K. Publisher = Small House Since the table scheme in this case allows more than one author name for the Authors attribute, the scheme is not in first normal form.

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