March 2009
Intermediate to advanced
784 pages
30h 30m
English
book
Microsoft® SQL Server® 2008 Internals
by Paul Randal Kalen Delaney Kimberly Tripp, and Conor Cunningham
Content preview from Microsoft® SQL Server® 2008 InternalsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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User-Defined Data Types
A user-defined data type (UDT) provides a convenient way for you to guarantee consistent use of underlying native data types for columns known to have the same domain of possible values. For example, perhaps your database stores various phone numbers in many tables. Although no single, definitive way exists to store phone numbers, consistency is important in this database. You can create a phone_number UDT and use it consistently for any column in any table that keeps track of phone numbers to ensure that they all use the same data type. Here’s how to create this UDT:
CREATE TYPE phone_number FROM varchar(20) NOT NULL;
And here’s how to use the new UDT when you create a table:
CREATE TABLE customer ( cust_id smallint NOT NULL, ...
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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.
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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.