Beginning Visual Basic 6 Database Programming - download pdf or read online

By John Connell

ISBN-10: 1430251921

ISBN-13: 9781430251927

ISBN-10: 1590592514

ISBN-13: 9781590592519

Beginning visible easy 6 Database Programming introduces you to databases and takes you all through to the most recent ADO applied sciences in visible uncomplicated 6. step-by-step, this ebook can help you to construct operating database parts and purposes in visible simple. no matter if you must paintings with databases in your laptop, get entry to legacy information, or software database entry around the web, this is often the publication that would get you started.

This publication offers you the entire useful wisdom and abilities you want to construct a fantastic starting place in Microsoft entry and visible uncomplicated database programming. This complete reference bargains thorough insurance of object-oriented programming, together with the right way to create facts dealing with periods and ActiveX controls for code reusability; the right way to successfully use DAO, ADO, ASP, and SQL; and the way to take info mining to the following level.

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The foreign key need not contain unique values. So we might want to find all of the titles published by the A K Peters Company. Its primary key contains the unique number 624. However in the Titles table, the foreign key field is also called PubiD but these do not contain unique values. So we can round up all records in the Titles table that have a value in the PubiD field of 624. The Authors Table ~Microsoft Access ยท Authors . Table lfiir-J ft:J Although we have 6246 records in this table, it appears that most of the Year Born fields are empty.

An index on a table works exactly the same way. The index permits the database software to quickly locate specific records, even though they might be scattered in different parts of the table. 18 I Chapter 7 - What ls a Database? I When we add information about a new book title, a new record is added to the database. Typically, each new record is placed at the end of the table. If we have a Titles table with over 8,500 records, we can bet the records were not entered in the database in alphabetic order.

When there is no data in a field, databases use a special NULL value to signify that there is no data present. We will be discussing NULL in detail later on, but NULL does not mean an empty string. It really means no data. The Au_ID is the primary key for the Authors table. Each author is unique, so the primary key identifies a single author. We can use this primary key field to index into the foreign Au_ID field in the Title Author table. This will permit us to find all books written by an individual author.

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Beginning Visual Basic 6 Database Programming by John Connell

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