By Ron Plew, Ryan Stephens
Sams train your self SQL in 21 Days, Fourth variation presents a offered starting place in knowing the basics of SQL (Structured question Language). SQL is the question language utilized by relational databases the sort of Oracle, Microsoft entry, and Microsoft SQL Server. the recent version covers object-oriented programming with SQL, ODBC, JDBC, embedded SQL, getting access to distant databases, and constructs. All new examples in line with an open resource database equivalent to MySQL increase this new version by way of making the examples without difficulty useable for readers.
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Distribution independence—Application programs and ad hoc requests are logically unaffected when data is first distributed or when it is redistributed. 12. Nonsubversion—It must not be possible to bypass the integrity rules defined through the database language by using lower-level languages. 1). 1 Codd’s relational database management system. Root node Level 1 Children of Root Level 2 Children of Level 1 Level 3 Children of Level 2 This method has several advantages and many disadvantages. In its favor is the fact that the physical structure of data on a disk becomes unimportant.
6 ODBC structure. Application (Calls ODBC functions) Driver Manager (Loads ODBC driver) ODBC Driver (Processes ODBC calls, submits SQL request, returns results) Data Source (Underlying DBMS) 20 Day 1 The unique feature of ODBC (as compared to the Oracle or Sybase libraries) is that none of its functions is database-vendor specific. For instance, you can use the same code to perform queries against a Microsoft Access table or against an Informix database with little or no modification. Once again, it should be noted that most vendors add some proprietary extensions to the SQL standard, such as Microsoft’s and Sybase’s Transact-SQL and Oracle’s PL/SQL.
7 WEEK 1 DAY 1 Getting Started with SQL Welcome to your first day of teaching yourself SQL. Today you will start your learning with a brief history on SQL and databases. This will provide you with a foundation that will help you through the rest of the book. More specifically, today you will learn the following: • The history of SQL and databases • Dr. Codd’s 12 rules for a relational database mode • How to design a database structure • What some of the popular SQL implementations are • Why open database connectivity (ODBC) is important A Brief History of SQL The history of SQL began in an IBM laboratory in San Jose, California, where SQL was developed in the late 1970s.
Sams Teach Yourself SQL in 21 Days by Ron Plew, Ryan Stephens