Download e-book for iPad: Access database design & programming: [what you really need by PhD Steven Roman

By PhD Steven Roman

ISBN-10: 1565926269

ISBN-13: 9781565926264

Whereas specific at intermediate Microsoft entry clients who're beginner programmers, this moment variation of the bestselling entry Database layout & Programming should still attract all degrees of entry builders. particularly, the hot variation includes:

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

    Expanded assurance of the VBA language itself, in accordance with reader requests

    Discussions of Microsoft's newest information entry expertise, known as lively facts items (or ADO), and Open Database Connectivity (ODBC), that's in detail attached with ADO

For beginner programmers, this ebook makes a speciality of generally ignored, yet however crucial, wisdom for constructing potent database functions. Its therapy of database layout and queries supplies intermediate and complicated builders a consolidated resource of information, 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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Additional info for Access database design & programming: [what you really need to know to develop with access]

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Note the small 1s and infinity signs, indicating the one side and many side of each relationship. 7. Relationships view showing various table relationships 9. To test the enforcement of referential integrity, try the following experiment: Open the BOOKS and PUBLISHERS tables and arrange them so that you can see both tables at the same time. Now change the value of PubID for Small House in the PUBLISHERS table from 3 to 4. As soon as you move the cursor out of the Small House row (which makes the change permanent), the corresponding PubID values in BOOKS should change automatically!

5. Relationship between the PUBLISHERS and BOOKS table 4. This window shows the relationship between PUBLISHERS and BOOKS, listing the key {PubID} in Publishers and the foreign key {PubID} in Books. ) 5. Now check the Enforce Referential Integrity box and click the Create button. 6. The problem is, of course, the dangling reference that we created by changing the PubID field in the BOOKS table to refer to a nonexistent publisher. 6. Error message due to dangling reference 6. Click the OK button, reopen the BOOKS table, and fix the offending entry (change the PubID field for Hamlet back to 2).

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. More generally, a set of attributes of a table scheme T is a foreign key for T if it is a key for some other table scheme S.

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Access database design & programming: [what you really need to know to develop with access] by PhD Steven Roman

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