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Appendix A: System Functions Text and Image Functions The text and image functions perform operations on text or image data. They are: ❑ PATINDEX (This was covered in the “String Functions” section earlier in the appendix.) ❑ TEXTPTR ❑ TEXTVALID TEXTPTR The TEXTPTR function checks the value of the text pointer that corresponds to a text, ntext, or image column and returns a varbinary value. The text pointer should be checked to ensure that it points to the first text page before running READTEXT, WRITETEXT, and UPDATE statements. The syntax is as follows: TEXTPTR() TEXTVALID 648 The TEXTVALID function checks whether a specified text pointer is valid. The syntax is as follows: TEXTVALID(‘’, ) The table.column parameter specifies the name of the table and column to be used. The text_ptr parameter specifies the text pointer to be checked. This function will return 0 if the pointer is invalid and 1 if the pointer is valid.
B Very Simple Connectivity Examples Entire books are written around the subject of connectivity. For the first several books I put out, I deliberately avoided the topic entirely in the basic belief that it is a simply huge topic — one that is difficult to do justice to in less than a full book. That said, having a SQL Server but not allowing programs to connect to it is the same as not having a SQL Server at all. Sure, we may log into Management Studio and write queries directly, but the reality is that the vast majority of our users out there never actually see the database directly. For this “Beginning” title, I’m still going to touch on the subject only in a very limited fashion that is purely meant for quick reference once you’ve looked at other sources, or perhaps to give you an inkling of what is involved. If you’re serious about displaying excellence in working with SQL Server or any other connectivity-based data solution, I highly recommend you purchase a book specifically on data access and connectivity. This appendix is a collection of extremely simple connectivity examples utilizing a couple of client languages and a few features in two different connectivity models. We’re going to stick a few basic examples of connecting within each language/model mix and leave the discussion of the whys and hows to books that are focused solely on connectivity. I can’t stress enough how these examples are truly the basics. You can make many, many choices and optimizations for connectivity. Each connectivity model has its own quirks, and different languages sometimes bring their own flair. If you’re trying to get more out of this than just a basic feel for how it’s done (or perhaps an “Oh yeah, I forgot that part”), check out the connectivity coverage I offer in Professional SQL Server 2008 Programming or perhaps another connectivity-specific book. (There are likely entire books just for your particular language and connectivity model mix.) Connectivity models covered here include: ❑ ADO.NET ❑ ADO
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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 386 r
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Chapter 12: Stored Procedures 388 -
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Chapter 12: Stored Procedures Note
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Chapter 12: Stored Procedures 392 n
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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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Chapter 12: Stored Procedures 408 f
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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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Transaction 4 This transaction wasn
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Oops — problem!!! Transaction 2 h
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The only cure for this is setting y
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Exclusive Locks Exclusive locks are
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Also: ❑ The Sch-S is compatible w
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The syntax for switching between th
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As with most things in life, howeve
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purchased. Process 2 records sales;
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Chapter 14: Transactions and Locks
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Chapter 15: Triggers the world’s
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Chapter 15: Triggers WITH ENCRYPTIO
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Chapter 15: Triggers FOR|AFTER The
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Chapter 15: Triggers 458 To illustr
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Chapter 15: Triggers 460 IF EXISTS
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Chapter 15: Triggers ❑ Feeding de
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Chapter 15: Triggers Trigger Firing
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Chapter 15: Triggers Like regular t
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Chapter 15: Triggers The COLUMNS_UP
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Chapter 15: Triggers This is the sa
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Chapter 15: Triggers 472 we have th
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Chapter 16: A Brief XML Primer So,
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Chapter 16: A Brief XML Primer Figu
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Chapter 16: A Brief XML Primer Elem
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Chapter 16: A Brief XML Primer ❑
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Chapter 16: A Brief XML Primer 482
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Chapter 16: A Brief XML Primer Name
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Chapter 16: A Brief XML Primer The
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Chapter 16: A Brief XML Primer 2. W
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Chapter 16: A Brief XML Primer SQL
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Chapter 16: A Brief XML Primer So,
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Chapter 16: A Brief XML Primer If,
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Chapter 16: A Brief XML Primer Note
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Chapter 16: A Brief XML Primer RAW
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Chapter 16: A Brief XML Primer AUTO
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Chapter 16: A Brief XML Primer EXPL
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Chapter 16: A Brief XML Primer Chec
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Chapter 16: A Brief XML Primer The
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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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Page 718 and 719: transactions (continued) COMMIT TRA
Page 720: View Builder View Builder (Manageme
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