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Setting Up and Operating the System 332 Identifying Network Location 333 Additional Software 334 Weblink Monitoring System Board Parts List 334 Web-Server Module Assembly Parts List 335 Threshold Comparator Board Parts List 335 Alarm Loop Input Circuit Parts List 336

After each Transact-SQL statement, the server sets the value of this variable to the total number of records affected by it. It can be used to verify the success of selected operations.

Database servers are one of the fastest-growing segments of the computer systems market, driven by database installations on Unix and Windows NT-based servers Database management thus touches every segment of the computer market Since the late 1980s a specific type of DBMS, called a relational database management system (RDBMS), has become so popular that it is the standard database form Relational databases organize data in a simple, tabular form and provide many advantages over earlier types of databases SQL is specifically a relational database language used to work with relational databases..

select Make, Model, EqTypeid into OldEquipment from Equipment where EqTypeid = 2 if @@rowcount = 0 Print "No rows were copied!"

When the normally closed switch is pressed, an open condition causes the input to go low, i.e., to ground. This configuration would also be good for alarm monitoring systems, where a supervisory condition exists. The code for this configuration is as follows:

4:

The history of the SQL language is intimately intertwined with the development of relational databases. Table 3-1 shows some of the milestones in its 30-year history. The relational database concept was originally developed by Dr. E.F. "Ted" Codd, an IBM researcher. In June 1970 Dr. Codd published an article entitled "A Relational Model of Data for Large Shared Data Banks" that outlined a mathematical theory of how data could be stored and manipulated using a tabular structure. Relational databases and SQL trace their origins to this article, which appeared in the Communications of the Association for Computing Machinery. Table 3-1: Milestones in the Development of SQL

NOTE: Certain statements (like the if statement) will set @@arowcount to 0, and certain statements (like Declare) will not affect it.

ROWCOUNT_BIG is a function introduced in SQL Server 2000. It returns the number of affected records in the form of a bigint number.

ACTIVE LOW normally closed input switch or sensor sense: if in0 =0 then activate goto sense activate: debug "switch depressed" goto sense

TIP: When you try to update an individual record, SQL Server will not report an error if your Where clause specifies a criterion that does not qualify any (or qualifies too many) records. SQL Server will not update anything, and you might, for example, think that the operation was successful. You can use @@rowcount to identify such cases.

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SQL Server 2000 introduces the table datatype. A statement declaring a table variable initializes the variable as an empty table with a specified structure. As a table definition, such a statement includes definitions of columns with their datatype, size, precision, optional primary key, unique and check constraints, and indexes. All elements have to be defined during the declaration. It is not possible to alter or add them later. The following batch declares a table variable, inserts rows in it, and returns them to the user:

In order to utilize the STAMP 2 to sense or control the outside world, you must change the direction of the I/O pins to tell the STAMP 2 that you would like to use a particular I/O pin as an output pin (see the manual on the CD-ROM) The STAMP 2 can control almost any type of device; however, it will supply only about 20 mA of current to an output device The STAMP 2 will drive an LED or optocoupler with no problem, but almost any other output device would need to be driven by a transistor The transistor acts a current switch that can control larger-current devices In Fig 2-5, the STAMP 2 turns on the LED when P0 goes low The cathode of the LED is sunk to ground through the output pin Figure 2-6 illustrates the STAMP 2 sourcing current to the LED.

Declare @MyTableVar table (Id int primary key, Lookup varchar(15)) Insert @MyTableVar values (1, '1Q2000') Insert @MyTableVar values (2, '2Q2000') Insert @MyTableVar values (3, '3Q2000') Select * from @MyTableVar Go

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Because of their nature, table variables have certain limitations: