SQL Clearly Explained (3rd Edition) by Jan L. Harrington

By Jan L. Harrington

SQL defined, 3rd Edition, presents an in-depth advent to utilizing SQL (Structured question Language). Readers will examine not just SQL syntax, but in addition how SQL works. realizing the how in addition to the what's going to reduction in growing SQL statements that execute as quick as possible.

The publication is prepared into 5 components. half I offers the theoretical fabric underlying relational databases and SQL. half II covers interactive SQL retrieval. half III discusses the production and administration of database constitution. It additionally covers non-data parts within the database surroundings, equivalent to dealing with users/user debts and transaction keep an eye on. half IV introduces numerous suggestions for SQL programming: Embedded SQL (using a high-level host language), dynamic SQL, and triggers/stored tactics. half V discusses the non-relational extensions which were extra to the SQL common: XML and object-relational functions. It covers object-oriented strategies, together with the variations among natural object-oriented databases and object-relational databases. It additionally seems to be at SQL's object-relational features.
• Demonstrates the best way to formulate SQL queries and the way queries are processed to maximise functionality of the database administration system
• Explains use of SQL to go into, regulate or delete information to keep up database structural elements
• Covers in nice element new SQL software for XML to satisfy the growing to be XML utilization in improvement of on-line content material

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Extra resources for SQL Clearly Explained (3rd Edition)

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W The -W option removes trailing spaces from a column. You can use this option with the -s option when preparing data that is to be exported to another application. You cannot use -W in conjunction with the -Y or -y option. -w column_width The -w option specifies screen width for output. The width must be from 9 to 65535. The default of 0 is equivalent to the width of the output device. For screen output, the default is the width of the screen. For files, the default width is unlimited. -X [1] The -X option disables options that can compromise security in batch files.

It looks for the appropriate settings on the command line and implicitly sets the appropriate scripting variables based on the command-line switches. 2. SQLCMD then reads the Windows environment settings and sets the SQLCMD scripting variables to the appropriate values, if available. 3. Finally, the SQLCMD initialization/start-up script is run, and :setvar commands in the script set SQLCMD scripting variables as appropriate. ■Note The -X and -x options disable start-up script execution and environment variable access, respectively.

The format to access all these variables is the same: $(variable_name). SQLCMD replaces your scripting variables with their respective values during script execution. Tables; Because scripting variables are replaced in a script “wholesale,” some organizations might consider their use a security risk because of the possibility of SQL Injection–style attacks. The -x command-line option turns this feature off. The SQLCMDINI scripting variable specifies the SQLCMD start-up script. This script is run every time SQLCMD begins.

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