Hướng dẫn học Microsoft SQL Server 2008 part 136 pptx
Hướng dẫn học Microsoft SQL Server 2008 part 136 pptx
... are the
language of SQL Server PTO, which is why this part of the book begins with
reading and interpreting the query execution plan.
Viewing Query Execution Plans
The SQL Server development team ... a
.sqlplan file. Cool add!
Examining plans using dynamic management views
Dynamic management views, or DMVs, previously introduced with SQL Server 2005, provide an excel-
lent window...
Hướng dẫn học Microsoft SQL Server 2008 part 5 pptx
... 1
Understanding SQL Server requires understanding T -SQL. The native language of the SQL Server
engine is Transact -SQL. Every command sent to SQL Server must be a valid T -SQL command.
Batches of stored T -SQL ... 3
The World of SQL Server
IN THIS CHAPTER
Why choose SQL Server?
Understanding the core of SQL
Server: the Relational Database
Engine
Approaching SQL Se...
Hướng dẫn học Microsoft SQL Server 2008 part 9 pptx
... example, instead of relating an assembly process
between any part, the assembly relationship must now relate with multiple types of parts.
49
www.getcoolebook.com
Nielsen c03.tex V4 - 07/21/2009 ... play before life became so busy.
(You can listen to some of my MP3s on my ‘‘about’’ page on
www.sqlserverbible.com.) There are some musicians who can
hear a song and then play it; I’m not one of...
Hướng dẫn học Microsoft SQL Server 2008 part 30 pptx
... query looks at the entire row (or,
more specifically, all the columns that participate in the union’s
SELECT statements).
SQL Server uses the ANSI Standard keyword
EXCEPT to execute a difference union:
SELECT ... 10
Summary
Merging data is the heart of SQL, and it shows in the depth of relational algebra as well as the power
and flexibility of SQL. From natural joins to exotic joins, SQL...
Hướng dẫn học Microsoft SQL Server 2008 part 34 pptx
... 54 91
2008 4 4 79 19 12 28
For the purposes of a GROUP BY, null values are considered equal to other nulls and are
grouped together into a single result row.
Grouping sets
Normally, SQL Server ... column listed in the
GROUP BY clause. Grouping sets is a variation of that theme that’s new for SQL Server 2008. With
grouping sets, a summation row is generated for each unique value in...
Hướng dẫn học Microsoft SQL Server 2008 part 59 pptx
... ypes
Traditionally, SQL Server stores both the date and the time in a single column using the datetime and
smalldatetime data types, described in Table 20-4. With SQL Server 2008, Microsoft released ... to the data. Without indexes, SQL Server must scan and filter to
select specific rows — a dog slow process at best. With the right indexes, SQL Server screams.
SQL Server...
Hướng dẫn học Microsoft SQL Server 2008 part 60 pptx
... 07/23/2009 4:48pm Page 560
Part IV Developing with SQL Server
What’s New with T -SQL Programming?
M
icrosoft has steadily enhanced Transact -SQL. SQL Server 7 saw unique identifiers, SQL Server 2000
added ... tune the server.
To compensate, each full-featured database product must complement the SQL
standard with some proprietary SQL language extension.
Transact -SQL, bett...
Hướng dẫn học Microsoft SQL Server 2008 part 61 pptx
... 07/23/2009 4:48pm Page 562
Part IV Developing with SQL Server
■ An application can submit a T -SQL batch using ADO or ODBC for execution.
■ A SQL script may be executed by running the SQLCMD command-line ... space.
The following example builds a list of departments in the
AdventureWorks2008 sample database
from the
HumanResources.Department table:
USE AdventureWorks2008;
Declare @MAV...
Hướng dẫn học Microsoft SQL Server 2008 part 65 pptx
... is changed or SQL Server is reconfigured. The
most common fatal errors are those caused by the following:
■ Data-type incompatibilities
■ Unavailable SQL Server resources
■ SQL Server advanced ... within
ad hoc queries
Executing stored procedures on
linked SQL servers
O
f all the possible SQL Server bad practices, I believe the worst is ad hoc
SQL. The solution: stored proce...
Hướng dẫn học Microsoft SQL Server 2008 part 67 pptx
... introduced in SQL Server 2000. If you’re
upgrading to SQL Server 2008 directly from SQL Server 2000, then it’s worth knowing that the APPLY
keyword, covered later in this chapter, was added in SQL Server ... result
set
S
QL Server 2000 introduced user-defined functions (UDFs), and the SQL
Server community was initially slow to adopt them. Nevertheless, UDFs
were my pers...
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