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The microprocessor in this example is sourcing current from the positive supply voltage through the LED to ground Some microcontrollers may not have enough sourcing current capacity, so a transistor may have to be used to drive an output The diagram in Fig 2-7 depicts an LED being driven by an npn transistor When pin P0 goes high, a current is caused to flow to the base of the 2N2222 npn transistor, thus effectively connecting the cathode of the LED to ground; this is known as sinking current to ground This example would be effective if you wished to turn on a high-current LED, or infrared LED, or other device that draws more current Figure 2-8 shows a similar application but uses a pnp transistor to drive a current device Note that the emitter of the transistor is connected to the plus supply voltage.

Table variables can only be part of the Select, Update, Delete, Insert, and Declare Cursor statements. Table variables can be used as a part of the Select statement everywhere tables are acceptable, except as the destination in a Select...Into statement:

Codd defines relational database model IBM's System/R project begins First article describing the SEQUEL language System/R customer tests Oracle introduces first commercial RDBMS Relational Technology introduces Ingres IBM announces SQL/DS ANSI forms SQL standards committee IBM announces DB2 ANSI SQL1 standard ratified Sybase introduces RDBMS for transaction processing ISO SQL1 standard ratified Ashton-Tate and Microsoft announce SQL Server for OS/2 First TPC benchmark (TPC-A) published TPC-B benchmark published SQL Access Group database access specification published Microsoft publishes ODBC specification ANSI SQL2 standard ratified TPC-C (OLTP) benchmark published First shipment of specialized SQL data warehousing systems First shipment of ODBC products TPC-D (decision support) benchmark published Commercial shipment of parallel database server technology Publication of standard API for OLAP database access and OLAP benchmark

Table variables can be used in Insert statements except when the Insert statement collects values from a stored procedure:

The current in this example is being sourced by the transistor Once again this application is for driving higher-current LEDs or other devices..

Unlike temporary tables, table variables always have a local scope. They can be used only in the batch, stored procedure, or function in which they are declared. The scope of cursors based on table variables is limited to the scope of the variable (the batch, stored procedure, or function in which they are defined). Table variables are considered to be nonpersistent objects, and therefore they will not be rolled back after a Rollback Transaction statement.

Flow control statements from TSQL are rather rudimentary as compared with similar commands in other modern programming languages such as Visual Basic or C++. Their use requires knowledge and some skill to overcome their lack of user friendliness. However, on a positive note, they allow the creation of very complex procedures. This section covers the use of the following Transact-SQL statements and programming constructs:

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Sometimes it s necessary to interface a microprocessor to other ICs or microprocessors. The circuit in Fig. 2-9 depicts a bipolar transistor turned on by the STAMP 2 on pin P0. Transistors are ideal interfacing devices; they require a small current to turn on and can easily isolate the next circuit stage. This circuit can be thought of as an inverting buffer, since the signal output from the STAMP 2 is a positive pulse. The output after the transistor becomes a low, thus creating an inverted and buffered signal. Many circuits require

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Developers can mark comments inside the source code of a batch or a stored procedure so that they are ignored during compilation and execution by SQL Server. It is a common practice to accompany source code with remarks that will help readers to understand the programmer s intentions. Comments can also be a piece of Transact-SQL source code that the developer does not want to execute for a particular reason (usually while developing or debugging). Such a process is usually referred to as commenting out the code.

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There are two methods to indicate a comment. A complete line or part of the line can be marked as a comment if the user places two hyphens (- -) at the beginning. The remainder of the line will become a comment. The comment will be finished at the end of line: