By Bob Villareal
The ebook covers basics resembling database normalization, question layout, item manipulation and optimization, and customized programming for varieties and studies. The reader turns into extra effective, effective, and a professional in entry VBA. This ebook bargains with getting info from open air resources and utilizing VBA to make sure info integrity and consistency, which no different entry VBA ebook does. It additionally tackles difficulties in numerous day by day events that programmers frequently face.
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Extra info for Access 2002 Programming by Example
This is what the relational model demands. It makes good sense. You certainly don’t want duplicate customer numbers if you want to identify a customer. Access does not mandate creating a primary key in every table, but it is strongly recommended because it is to your advantage that you do so. Your situation might vary, but this is a general principle. Because the Employee ID field is not unique, you need to create a composite (two fields acting as one) field, which acts as a key to create uniqueness.
1. MDB). You also can copy it from the Access/Office CD-ROM. 2. When you see the Northwind introductory screen, click OK, and then click the Display Database Window button. Joins and Cascades 27 While in Access, if you click the Relationships button (which is two buttons to the left of the question mark), you enter the Relationships window. Take a look at the tables laid out in a one-to-many relationship. Notice that there are join lines joining the various tables. 1. 1: The join lines in the Relationships window give a graphical representation of the one-to-many relationships between tables.
Slashes, 46 Chapter 3: The Table—The Heart of Any Database dashes, periods, or whatever other delimiter you choose, can automatically be entered for you with an input mask. You can sort on these dates from latest to earliest if you choose ascending order and you can calculate the time span between two periods. ✔ To learn more about custom formatting that includes dates, see “Testing and Using Custom Formats,” later in this chapter. Currency You can use the Currency data type if you plan to perform calculations on a field that contains data with up to fifteen digits on the left side of the decimal and up to four digits on the right side of the decimal.
Access 2002 Programming by Example by Bob Villareal