Read e-book online Sams Teach Yourself SQL in 21 Days PDF

By Ron Plew, Ryan Stephens

ISBN-10: 0672324512

ISBN-13: 9780672324512

Sams train your self SQL in 21 Days, Fourth variation presents a bought starting place in realizing the basics of SQL (Structured question Language). SQL is the question language utilized by relational databases this kind of Oracle, Microsoft entry, and Microsoft SQL Server. the recent variation covers object-oriented programming with SQL, ODBC, JDBC, embedded SQL, gaining access to distant databases, and constructs. All new examples according to an open resource database reminiscent of MySQL increase this re-creation by means of making the examples comfortably useable for readers.

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Extra info for Sams Teach Yourself SQL in 21 Days

Sample text

The principle is much the same as a compiler versus an interpreter. The performance for this type of SQL is good; however, it is not flexible—and cannot always meet the needs of today’s changing business environments. Dynamic SQL is discussed shortly. The ANSI 1992 standard (SQL-92) extended the language and became an international standard. It defines three levels of SQL compliance: entry, intermediate, and full. The new features that SQL-92 introduced include the following: Getting Started with SQL 21 • Connections to databases • Scrollable cursors • Dynamic SQL • Outer joins The latest ANSI standard (SQL3) has five interrelated documents.

2. Guaranteed access—Every value in a relational database is guaranteed to be accessible by using a combination of the table name, primary key value, and column name. 3. Systematic null value support—The DBMS provides systematic support for the treatment of null values (unknown or inapplicable data), which are distinct from default values, and independent of any domain. 4. Active, online relational catalog—The description of the database and its contents is represented at the logical level in tabular format and can therefore be queried using the database language.

Tomorrow you learn how to make your queries even more selective. Q&A Q Where did this data come from and how do I connect to it? A The data was created using the methods described on Day 11. The database connection depends on how you are using SQL. The method shown is the traditional command-line method used on commercial-quality databases. These databases have traditionally been the domain of the mainframe or the workstation, but recently they have migrated to the PC. Q Okay, but if I don’t use one of these databases, how will I use SQL?

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