Hướng dẫn học Microsoft SQL Server 2008 part 41 pot
Hướng dẫn học Microsoft SQL Server 2008 part 41 pot
... query. While SQL Server 2008 s new filtered indexes
are a perfect fit, it’s still a performance killer.
■ To make matters worse, because the rows still physically exist in SQL Server, and SQL Server s
declarative ... dif-
ferences. Ignoring for a moment the new
MERGE command in SQL Server 2008, there are a few ways to
code an upsert operation with T -SQL:
■ The most common meth...
Hướng dẫn học Microsoft SQL Server 2008 part 1 pot
... been using SQL Server since version 6.5. Jacob compressed his vast
knowledge of SQL Server and XML into Chapter 18.
Allen White, SQL Server MVP (with a minor in PowerShell), is a SQL Server Trainer ... Australian SQL Server community, and president of the Queensland SQL
Server User Group. Peter is a highly regarded speaker at SQL Server events throughout Australia...
Hướng dẫn học Microsoft SQL Server 2008 part 4 pot
... minute details when desired. SQL
Server is a dream system for a database developer.
If there’s a theme to SQL Server 2008, it’s this: enterprise-level excellence. SQL Server 2008 opens sev-
eral new ... Developing with SQL Server
Part V: Data Connectivity
Part VI: Enterprise Data Management
Part VII: Security
Part VIII: Monitoring and Auditing
Part IX: Performance...
Hướng dẫn học Microsoft SQL Server 2008 part 15 potx
... world of SQL Server. The top level of the
tree lists the connected servers. Object Explorer can connect to a server regardless of whether the
server is known by Registered Servers. The server icon ... side.
Registered Servers
Registered Servers is an optional feature. If you manage only one or a few SQL Servers, then Registered
Servers offers little benefit. If, however, you are res...
Hướng dẫn học Microsoft SQL Server 2008 part 25 pot
... T -SQL code. SQL Server includes dozens of
functions. This section describes the functions I find most useful.
Best Practice
P
erformance is as much a part of the data-schema design as it is a part ... computer on which the instance of SQL Server is running. The time zone offset is
included.
■
ToDateTimeOffset(): Returns a DateTimeOffset type
The following four SQL Server date...
Hướng dẫn học Microsoft SQL Server 2008 part 26 potx
... types: DateTime and DateTime2. DateTime2 is new to SQL
Server 2008 and represents time to a much finer granularity: within 100 nanoseconds.
■ DatePart(date portion, date): Returns the ordinal number ... the complete date, only
the date part being extracted:
select DATEDIFF(year,’september 4 2008 ,’november 10 2009’)
Result
1
select DATEDIFF(month,’september 4 2008 ,’november 10 2009’...
Hướng dẫn học Microsoft SQL Server 2008 part 31 potx
... ProductCategoryID
FROM dbo.ProductCategory
Where ProductCategoryName = ‘Kite’);
To execute this query, SQL Server first evaluates the subquery and returns a value to the outer query
(your unique identifier ... Practice
S
QL is very flexible — there are often a dozen ways to express the same question. Your choice of SQL
method should be made first according to your style and to which method...
Hướng dẫn học Microsoft SQL Server 2008 part 32 potx
... rows, then SQL Server will execute the logical equivalent of 101
queries — one for the outer query, and one subquery for every row returned by the outer query.
In practice, the SQL Server Query ... 4
8 Melanie Campbell 3
12 Alysia Halloway 3
20 Grace Halloway 2
Row constructors
New for SQL Server 2008, row constructors provide a convenient way to supply hard-coded values
direct...
Hướng dẫn học Microsoft SQL Server 2008 part 51 pot
... about
the structure of the XML document.
An XML document is usually described using a schema. SQL Server can generate an XML or XDR (XML
Data Reduced) schema along with the query results of a
FOR ... row and one column containing an NVARCHAR(MAX)
value. The TYPE directive can be used to request SQL Server to return an XML data type value,
instead of
NVARCHAR(MAX). FOR XML queries can...
Hướng dẫn học Microsoft SQL Server 2008 part 58 potx
... (NEWID())
PRIMARY KEY NONCLUSTERED,
541
www.getcoolebook.com
Nielsen c20.tex V4 - 07/23/2009 8:26pm Page 538
Part IV Developing with SQL Server
Declarative referential integrity
SQL Server s declarative referential ... - 07/23/2009 8:26pm Page 536
Part IV Developing with SQL Server
Using uniqueidentifier surrogate primary keys
The uniqueidentifier data type is SQL Server s...