Ben Forta's Sams Teach Yourself SQL in 24 Hours (4th Edition) PDF

By Ben Forta

ISBN-10: 0672336073

ISBN-13: 9780672336072

In exactly 24 classes of 1 hour or much less, you'll research expert options to layout and construct effective databases and question them to extract precious info. utilizing a simple, step by step process, each one lesson builds at the earlier one, permitting you to profit the necessities of ANSI SQL from the floor up.

Example code demonstrates the authors’ expert strategies, whereas routines written for MySQL provide the reader hands-on studying with an open-source database. integrated are complex thoughts for utilizing perspectives, coping with transactions, database management, and lengthening SQL.

Step-by-step directions conscientiously stroll you thru the commonest SQL tasks.
Q&As, Quizzes, and routines on the finish of every bankruptcy assist you attempt your knowledge.
Notes and assistance indicate shortcuts and solutions.
New phrases are truly outlined and defined.

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Extra info for Sams Teach Yourself SQL in 24 Hours (4th Edition)

Example text

However, the basics are the same among all implementations. The very basic data types, as with most other languages, are . String types . Numeric types . Date and time types Basic Data Types 29 Fixed-Length Strings Constant characters, those strings that always have the same length, are stored using a fixed-length data type. The following is the standard for an SQL fixed-length character: CHARACTER(n) n represents a number identifying the allocated or maximum length of the particu- lar field with this definition.

For example, you can create a type as follows: CREATE TYPE PERSON AS OBJECT (NAME VARCHAR (30), SSN VARCHAR (9)); You can reference your user-defined type as follows: CREATE TABLE EMP_PAY (EMPLOYEE PERSON, SALARY DECIMAL(10,2), HIRE_DATE DATE); Notice that the data type referenced for the first column EMPLOYEE is PERSON. PERSON is the user-defined type you created in the first example. Domains A domain is a set of valid data types that can be used. A domain is associated with a data type, so that only certain data is accepted.

When a user initially connects to the database, a session is established. Within the scope of a SQL session, valid SQL commands can be entered to query the database, manipulate data in the database, and define database structures, such as tables. A session may be invoked by either direct connection to the database or through a front-end application. In both cases, sessions are normally established by a user at a terminal or workstation that communicates through a network with the computer that hosts the database.

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