Wiley 978-0-7645-7955-4 Datasheet

1Introducing Transact-SQLand Data ManagementSystemsWelcome to the world of Transact-Structured Query Language programming. Transact-SQL, or T-SQL, is

Data Type Storage DescriptionDateTime 8 bytes Datetime is used to store dates from January 1,1753 through December 31, 9999 (which couldcause a huge

Data Type Storage DescriptionnChar 2 bytes per character. The nchar data type is a fixed-length type identical Maximum 4000 to the char data type wi

Data Type Storage DescriptionTimeStamp 8 bytes The timestamp data type has nothing to do withtime. It is more accurately described as a row ver-sion d

in how the data is treated. The classic text, ntext, and image data types are Large Object (LOB) data typesand can’t typically be used with parameters

Figure 1-7Because the same employee could sell products to many customers, the relationship between theEmployee table and the Sale table is called a o

❑ One-to-exactly-one❑ Many-to-manyThe many-to-many relationship requires three tables because a many-to-many constraint would beunenforceable. An exam

RDBMS and Data IntegrityThe RDBMS is designed to maintain data integrity in a transactional environment. This is accomplishedthrough several mechanism

SQL Server utilizes six lock types, or more accurately, six resource lock modes:❑ Shared❑ Update❑ Exclusive❑ Intent❑ Schema❑ Bulk UpdateShared, Update

Exclusive LocksSQL Server typically issues Exclusive locks when a modification is executed. To change the value of afield in a row SQL Server grants e

with Windows NT. It took a couple of years before SQL Server really became a viable product. The SQLServer team went to work to create a brand new dat

English part but retaining the pronunciation to identify it with its predecessor. Today, several implemen-tations of SQL by different stakeholders are

IBM to the top spot over Oracle as they brought existing Informix customers with them. Today, Informixruns on Linux and integrates with other IBM prod

SummaryMicrosoft SQL Server 2000 remains a very capable and powerful database management server, but I ammore than just a little excited about the upc

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are inefficient as far as memory and CPU consumption are concerned. They do this because it is the easi-est and quickest way to finish the code. I agr

especially custom extended stored procedures, which are almost always implemented through unmanaged code, have typically been the source of a majority

the ability to store objects was becoming more important. They incorporated mechanisms to beable to store classes and objects in the relational model.

Figure 1-2Primary KeysTo efficiently manage the data in your table you need to be able to uniquely identify each individual rowin the table. It is muc

With the EmployeeKey column, you have an efficient, easy-to-manage primary key.Each table can have only one primary key, which means that this key col

Column NamesKeep the names simple and intuitive. For more information see Chapter 11.Data TypesThe general rule on data types is to use the smallest o

Data Type Storage DescriptionDecimal 5 – 17 bytes A predefined, fixed, signed decimal number ranging from -100000000000000000000000000000000000001(-10