Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

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Chapter 16: A Brief XML Primer Namespaces 484 With all this freedom to create your own tags, to mix and match data from other sources, and just otherwise do your own thing, there are bound to be a few collisions here and there about what things are going to use what names in which places. For example, an element with a name of “letter” might have entirely different structure, rules, and meaning to an application built for libraries (for whom a letter is probably a document written from one person to another person) than it would to another application, say one describing fonts (which might describe the association between a character set and a series of glyphs). To take this example a little further, the nature of XML is such that industry organizations around the world are slowly agreeing on naming and structure conventions to describe various types of information in their industry. Library organizations may have agreed on element formats describing books, plays, movies, letters, essays, and so on. At the same time, the operating systems and/or graphics industries may have agreed on element formats describing pictures, fonts, and document layouts. Now, imagine that we, the poor hapless developers that we are, have been asked to write an application that needs to render library content. Obviously, library content makes frequent use of things like fonts — so, when you refer to something called “letter” in your XML, are you referring to something to do with the font or is it a letter from a person to another person (say, from Thomas Jefferson to George Washington)? We have a conflict, and we need a way to resolve it. That’s where namespaces come in. Namespaces describe a domain of elements and attributes and what their structure is. The structure that supports letters in libraries would be described in a libraries namespace. Likewise, the graphics industry would likely have their own namespace(s) that would describe letters as they relate to that industry. The information for a namespace is stored in a reference document, and can be found using a Uniform Resource Identifier (URI) — a special name, not dissimilar from a URL — that will eventually resolve to our reference document. When we build our XML documents that refer to both library and graphics constructs, then we simply reference the namespaces for those industries. In addition, we qualify elements and attributes whose nature we want the namespace to describe. By qualifying our names using namespaces, we make sure that, even if a document has elements that are structurally different but have the same name, we can refer to the parts of our document with complete confidence that we are not referring to the wrong kind of element or attribute. To reference a namespace to the entire document, we simply add the reference as a special attribute (called xmlns) to our root. The reference will provide both a local name (how we want to refer to the namespace) and the URI that will eventually resolve to our reference document. We can also add namespace references (again, using xmlns) to other nodes in the document if we want to apply only that particular namespace within the scope of the node we assign the namespace, too. What follows is an example of an XML document (technically, this is what we call a schema) that we will be utilizing later in the chapter. Notice several things about it as relates to namespaces: The document references three namespaces — one each for XDR (this happens to be an XDR document), a Microsoft data type namespace (this one builds a list about the number and nature of different data types), and, last, but not least, a special SQL namespace used for working with SQL Server XML integration. Some attributes (including one in the root) are qualified with namespace information (see the sql:relation attribute, for example).
The sql data type references a couple of special attributes. We do not have to worry about whether the Microsoft data types namespace also has a field or relation data type because we are fully qualifying our attribute names. Even if the data types namespace does have an attribute called field, our XML parser will still know to treat this element by the rules of the sql namespace. Element Content Chapter 16: A Brief XML Primer Another notion of XML and elements that deserves mention (which is close to all it will get here) is the concept of element content. Elements can contain data beyond the attribute level and nested elements. While nested elements are certainly one form of element content (one element contains the other), XML also allows for row text information to be contained in an element. For example, we could have an XML document that looked something like the following: The customer called in today and placed another order. Says they really like our work and would like it if we would consider establishing a location closer to their base of operations. Followed up with the customer on new location. Customer agrees to guarantee us $5,000 per month in business to help support a new office. 485
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Programmer to Programmer Get more
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Beginning Microsoft SQL Ser ver® 2
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Beginning Microsoft SQL Ser ver® 2
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About the Author Experiencing his f
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Acknowledgments Over the years, the
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Contents Chapter 2:T ools of the T
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Contents xviii The CREATE Statement
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Contents xx Correlated Subqueries 1
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Contents xxii SORT_IN_TEMPDB 280 ON
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Contents xxiv Control-of-Flow State
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Contents xxvi How the SQL Ser ver L
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Contents Chapter 16: A Brief XML Pr
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Contents Chapter 19: Pla ying Admin
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Introduction The beginning user wil
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Introduction ❏ We show file names
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Introduction xxxvi ❏ Understand t
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Chapter 1: RDBMS Basics: What Makes
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Chapter 2: Tools of the Trade 22 My
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Chapter 2: Tools of the Trade ❑ S
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Chapter 2: Tools of the Trade 26 Ke
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Chapter 2: Tools of the Trade 28 Th
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Chapter 2: Tools of the Trade 30 lo
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Chapter 2: Tools of the Trade 32 3.
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Chapter 2: Tools of the Trade 34 Fi
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Chapter 2: Tools of the Trade Figur
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Chapter 2: Tools of the Trade Note
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Chapter 2: Tools of the Trade bcp i
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3 The Foundation Statements of T-SQ
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asic SELECT statement. Fire up the
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Now let’s try taking a little bit
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very few of your tables will have s
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Operator Example Usage Effect ALL,
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Chapter 3: The Foundation Statement
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WHERE SalesOrderID IN (43660, 43670
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AVG This one is for computing avera
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efore, but remove the two AS keywor
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You’ll get a result that is a bit
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What if we want to place conditions
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Let’s say, for example, that we w
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City varchar(20) NOT NULL, State ch
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for it in the INSERT statement. For
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And sure enough, we get back the on
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Chapter 4: JOINs 82 returned is in
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Chapter 4: JOINs 84 Using an INNER
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Chapter 4: JOINs 86 Uh, oh — this
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Chapter 4: JOINs How It Works Unlik
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Chapter 4: JOINs If we were to look
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Chapter 4: JOINs 92 What I’m tryi
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Chapter 4: JOINs 16 Mountain-500 Si
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Chapter 4: JOINs 96 Let’s use thi
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Chapter 4: JOINs 98 vendor. We’re
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Chapter 4: JOINs 100 Somehow, we lo
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Chapter 4: JOINs Try It Out FULL JO
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Chapter 4: JOINs Every time I teach
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Chapter 4: JOINs JOIN Sales.Special
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Chapter 4: JOINs Figure 4-1 As alwa
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Chapter 4: JOINs 110 CREATE TABLE U
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Chapter 4: JOINs There are two diff
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Chapter 5: Creating and Altering Ta
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Chapter 6: Constraints At a more sp
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Chapter 6: Constraints We can then
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Chapter 6: Constraints A table can
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Chapter 6: Constraints FOREIGN KEY
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Chapter 6: Constraints How It Works
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Chapter 6: Constraints Cascading Ac
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Chapter 6: Constraints 166 This is
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Chapter 6: Constraints 168 FROM Ord
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Chapter 6: Constraints 170 Let’s
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Chapter 6: Constraints CHECK Constr
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Chapter 6: Constraints Defining a D
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Chapter 6: Constraints Ignoring Bad
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Chapter 6: Constraints Try running
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Chapter 6: Constraints Rules and De
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Chapter 6: Constraints Dropping Rul
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Chapter 6: Constraints 184 Restrict
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7 Adding More to Our Queries When I
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Building a Nested Subquery A nested
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While this works just fine, queries
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We’ll go back to the AdventureWor
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❑ Aliases are used in both querie
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Now let’s see this at work in our
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So let’s take this now and apply
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This join-based syntax, for example
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IF NOT EXISTS (SELECT ‘True’ FR
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The conversions can actually get a
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there are no other roll up records
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GROUP BY soh.OrderDate, sod.Product
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OUTPUT $action, inserted.Year, inse
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The long-standing, traditional view
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8 Being Normal: Normalization and O
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Chapter 8: Being Normal: Normalizat
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9 SQL Ser ver Storage and Index Str
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Page Splits When a page becomes ful
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The point here is that what happens
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Page Splits — A First Look All of
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You may hear lots of bad things abo
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Navigating the Tree Figure 9-4 As I
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there was no link between the data.
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Root Non-Leaf Level Leaf Level Figu
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The CREATE INDEX Statement The CREA
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FILLFACTOR When SQL Server first cr
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works only if tempdb is on a separa
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Secondary XML Indexes Chapter 9: SQ
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occur, and that one or more non-lea
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isn’t room on the page, SQL Serve
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more administrator oriented and usu
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The Database Engine Tuning Advisor
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The output is far more self-describ
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We use a FILLFACTOR when we need to
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Chapter 9: SQL Server Storage and I
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Chapter 10: Views The preceding syn
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Chapter 10: Views 302 columns to a
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Chapter 10: Views Try It Out Using
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Chapter 10: Views 306 soh.SalesOrde
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Chapter 10: Views AW00000676 43659
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Chapter 10: Views NULL values will
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Chapter 10: Views Editing V iews wi
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Chapter 10: Views 314 There are fou
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Chapter 10: Views Editing Views in
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Chapter 10: Views 318 In addition,
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Chapter 10: Views 320 from the firs
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Chapter 10: Views You can get the y
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11 Writing Scripts and Batches Whet
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Next we have a DECLARE statement to
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I’m not going to pick any bones a
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Using @@IDENTITY @@IDENTITY is one
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How It Works What we’re doing in
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DECLARE @RowCount int; --Notice the
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When the editing tool encounters a
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When you think about it, this seems
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So, let’s try a quick query direc
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We now have our text file source fo
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Let’s build an example in the Adv
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DECLARE @InVar varchar(50); DECLARE
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-- This won’t work DECLARE @Numbe
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-- Now we’re run our conditional
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Out of the condition from inner con
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A Simple CASE A simple CASE takes a
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3 8 More Than One Apart 2 2 Ends Wi
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Now, I don’t know about you, but
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The WAITFOR statement does exactly
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IF @ErrorNo = 2714 -- Object exists
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Chapter 11: Writing Scripts and Bat
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Chapter 12: Stored Procedures Creat
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Chapter 12: Stored Procedures Dropp
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Chapter 12: Stored Procedures Suppl
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Chapter 12: Stored Procedures 374 [
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Chapter 12: Stored Procedures Confi
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Chapter 12: Stored Procedures Now,
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Chapter 12: Stored Procedures SQL S
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Chapter 12: Stored Procedures 382 c
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Chapter 12: Stored Procedures It wo
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Chapter 12: Stored Procedures Note
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Chapter 12: Stored Procedures All t
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Chapter 12: Stored Procedures Sproc
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Chapter 12: Stored Procedures When
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Chapter 12: Stored Procedures 400 @
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Chapter 12: Stored Procedures I’d
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Chapter 12: Stored Procedures match
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Chapter 12: Stored Procedures There
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13 User-Defined Functions Well, her
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types!), except for BLOBs, cursors,
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We get back the same set as with th
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AS RETURN (SELECT BusinessEntityID,
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in your relational database. These
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AS BEGIN ( EmployeeID int NOT NULL,
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So, as you can see, we can actually
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Despite being schema-bound, this on
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14 Transactions and Locks This is o
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we are unable or do not want to com
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Figure 14-1 Data needed Data in cac
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Chapter 17: Reporting for Duty, Sir
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Chapter 18: Getting Integrated with
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19 Playing Administrator And so, he
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❑ Write the information to the ev
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Creating Jobs and Tasks Using Manag
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Let’s go ahead and move on to the
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Figure 19-8 Figure 19-9 Chapter 19:
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Figure 19-11 Figure 19-12 Chapter 1
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Backup and Reco very No database-dr
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❑ Differential: This might be ref
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❑ Simple: Under this model, the t
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The older DBCC commands are still s
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many rows inserted over time and th
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Chapter 19: Playing Administrator T
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Appendix A: System Functions In add
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Appendix A: System Functions @@TOTA
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Appendix A: System Functions CHECKS
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Appendix A: System Functions SUM Th
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Appendix A: System Functions The de
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Appendix A: System Functions @@REMS
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Appendix A: System Functions Cert_I
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Appendix A: System Functions Encryp
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Appendix A: System Functions @@FETC
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Appendix A: System Functions CURREN
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Appendix A: System Functions SYSDAT
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Appendix A: System Functions GetRoo
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Appendix A: System Functions The ex
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Appendix A: System Functions RAND T
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Appendix A: System Functions ❑ IN
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Appendix A: System Functions ❑ Is
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Appendix A: System Functions FILEGR
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Appendix A: System Functions INDEX_
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IsCheckCnst IsConstraint IsDefault
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Appendix A: System Functions OBJECT
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Appendix A: System Functions TYPEPR
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Appendix A: System Functions The qu
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Appendix A: System Functions The SU
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Appendix A: System Functions ASCII
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Appendix A: System Functions The ch
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Appendix A: System Functions UNICOD
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Appendix A: System Functions CAST a
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Appendix A: System Functions HOST_I
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Appendix A: System Functions NULLIF
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Appendix A: System Functions 646 Pr
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Appendix A: System Functions Text a
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Appendix B: Very Simple Connectivit
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ABS function A ABS function, 611 AC
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closing tags closing tags, XML docu
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cryptographic functions (continued)
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defects defects. See well formed XM
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EXPLICIT option EXPLICIT option bas
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IGNORE_DUP_KEY option (CREATE INDEX
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LOWER function LOWER function, 635
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online transaction-processing (OLTP
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query results query results alphabe
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scripts (continued) creating with M
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state state, basics of, 391 stateme
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transactions (continued) COMMIT TRA
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View Builder View Builder (Manageme
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