Download SQL: A Beginner's Guide (2nd Edition) by Robert Sheldon PDF

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By Robert Sheldon

Here's the root upon which you could construct your relational database layout and programming, then follow these talents to any SQL-based product. rigorously equipped for newbies, you'll study step by step how one can create a database, create tables, implement information integrity, question and alter facts, and enforce complicated facts entry options.

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Over the years, a number of database models have been implemented to store and manage data. Several of the more common models include the following: ● Hierarchical This model has a parent-child structure that is similar to an inverted tree, which is what forms the hierarchy. A parent table can have many child tables, but a child table can have only one parent table. Although the model has been highly implemented, it is often considered unsuitable for many applications because of its inflexible structure and lack of support for complex relationships.

The SQL keywords most often associated with DDL statements are CREATE, ALTER, and DROP. For example, you would use the CREATE TABLE statement to create a table, the ALTER TABLE statement to modify the table’s properties, and the DROP TABLE statement to delete the table definition from the database. vp Friday, April 04, 2003 5:00:12 PM Begin8 / SQL: A Beginner’s Guide / Sheldon / 222885-7 / 1 Blind Folio 1:17 SQL: A Beginner’s Guide ● Data Control Language (DCL) DCL statements allow you to control who has access to specific objects in your database.

Each type of component performs a specific function within the SQL environment. Table 2-1 describes the six types. Component Type Description SQL agent Any structure that causes SQL statements to be executed. The SQL agent is bound to the SQL client within the SQL implementation. SQL implementation A processor that executes SQL statements according to the requirements of the SQL agent. The SQL implementation includes one SQL client and one or more SQL servers. The SQL client establishes SQL connections with the SQL servers and maintains data related to interactions with the SQL agent and the SQL servers.

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