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SQL Server 2000 Stored Procedure & XML Programming
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One of the major disadvantages of file-server architecture is high network traffic due to the fact that entire files are being transferred across the network. If a client/server system is well designed, the client will receive just the information it needs, which is usually just a slight portion of the database, thus significantly reducing the network traffic. If a client/server system is implemented with even more of the processing/business logic on the server (that is, using stored procedures), even less data will be transferred back and forth through the network.
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Stored procedures have several performance advantages over ad hoc queries. Stored procedures are cached in a compiled form on the database server, so when they need to be used, the server does not have to parse and recompile them again. A developer can optimize a stored procedure s code so that every user will use the best possible method to perform an action.
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One sign of a well-designed database system is that it prevents users from directly accessing the tables and forces them to use stored procedures to perform specific functions. It is also easier to manage a set of stored procedures by functionality than to manage table- and column-level permissions.
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T-SQL Identifiers Database Object Qualifiers Data Types Variables Flow-Control Statements Cursors
SQL Server 2000 Stored Procedure & XML Programming
ll modern relational database management systems are based on an implementation of SQL (Structured Query Language). Most vendors have extended SQL into a more sophisticated programming language. The ANSI committee has standardized the language several times, of which ANSI SQL-92 is the latest specification. Unfortunately (or fortunately depending on your point of view), each vendor has created its own version of this specification to extend ANSI SQL. The language in use in Microsoft SQL Server is called Transact-SQL (T-SQL). It complies with the Entry Level ANSI SQL-92 standard, and you can use this ANSI SQL compliant language to select, update, insert, and delete records from tables.
T-SQL Identifiers
All databases, servers, and database objects in SQL Server (such as tables, constraints, stored procedures, views, columns, and data types) must have unique names, or identifiers. They are assigned when an object is created, and used thereafter to identify the object. The identifier for the object may, if needed, be changed. The following are the rules for creating identifiers: Identifiers in SQL Server 2000 may have between 1 and 128 characters. There are exceptions to this rule: certain objects are limited (for instance, temporary tables can have identifiers up to only 116 characters long). Before Microsoft SQL Server 7.0, identifiers were limited to 30 characters. The first character of the identifier must be a letter, underscore ( _ ), at sign (@), or number sign (#). The first letter must be defined in the Unicode 2.0 standard. Among other letters, Latin letters a z and A Z can be used as a first character. Some characters (@ and #) have special meanings in T-SQL. They act as signals to SQL Server to treat their carriers differently. Subsequent characters must be letters from the Unicode 2.0 standard, or decimal digits, or one of the special characters @, #, _, or $. SQL Server reserved words should not be used as object identifiers. Identifiers cannot contain spaces or other special characters except for @, #, _, or $.
You can check which identifiers are valid by using the system stored procedure sp_validname.
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If the identifier does not comply with one of the previous rules, it is referred to as a delimited identifier, and it must be delimited by double quotes (" ") or square brackets ( [ ] ) when referenced in T-SQL statements. You can change the default behavior if you use the Set Quoted_Identifier Off statement. The role of single and double quotes will be reversed. Single quotes will delimit identifiers, and double quotes will delimit strings. As an interim migration aid, you can specify the compatibility mode in which SQL Server will run using the system stored procedure sp_dbcmptlevel. Changing the compatibility mode will affect the way in which SQL Server interprets identifiers. You should check Books Online for more information if you are running in any compatibility mode other than 80.
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