March 2008
Beginner
960 pages
24h 34m
English
book
2007 Microsoft® Office System Step by Step, Second Edition
by Joyce Cox, Curtis D. Frye, M. Dow Lambert III, Steve Lambert, John Pierce, Joan Lambert
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Restricting the Type of Data in a Field
The Data Type setting restricts entries in a field to a specific type of data, such as text, numbers, or dates. If, for example, the data type is set to Number and you attempt to enter text, Access refuses the entry and displays a warning.
The field properties you can set to control input are:
Required
Allow Zero Length
Field Size
Input Mask
Validation Rule
The Required and Allow Zero Length properties are fairly obvious. If the Required property is set to Yes, the field can’t be left blank. However, Access differentiates between a blank field (which it refers to as a Null field) and a field that looks blank, but contains an empty string. If Allow Zero Length is set to Yes, you can enter an empty string (two quotation ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.