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The size and scope of the SQL standard has increased significantly since the first standard was adopted The original standard (SQL-86) contained about 150 pages, while the SQL-92 standard contained more than 600 pages In contrast, the most recent standards (SQL: 1999 and SQL:2003) contained more than 2,000 pages The early standards (SQL-86 and SQL-89) had two levels (entry and full) SQL-92 added a third level (entry, intermediate, and full) The SQL: 1999 and SQL:2003 standards contain a single level called Core SQL along with parts and packages for noncore features SQL:2003 contains three core parts, six optional parts, and seven optional packages The weakness of the SQL standards is the lack of conformance testing Until 1996, the US Department of Commerce's National Institute of Standards and Technology conducted conformance tests to provide assurance that government software can be ported among conforming DBMSs Since 1996, however, DBMS vendor claims have substituted for independent conformance testing Even for Core SQL, the major vendors lack support for some features and provide proprietary support for other features With the optional parts and packages, conformance has much greater variance Writing portable SQL code requires careful study for Core SQL but is not possible for advanced parts of SQL The presentation in this chapter is limited to a subset of Core SQL:2003 Most features presented in this chapter were part of SQL-92 as well as Core SQL:2003 Other chapters present other parts of Core SQL as well as important features from selected SQL:2003 packages

Remember, strcmp( ) returns false if the strings are equal Be sure to use the logical operator ! to reverse the condition, as just shown, if you are testing for equality Although C++ defines a string class, null-terminated strings are still widely used in existing programs They will probably stay in wide use because they offer a high level of efficiency and afford the programmer detailed control of string operations However, for many simple string-handling chores, C++'s string class provides a convenient alternative

The design and performance of typical sections which manipulate the database are the subjects of Chap 3 There we will consider that the sections are not a ected by activities being carried on simultaneously in the same or adjacent databases Interactions will be encountered beginning in Chap 5, and Chap 13 will be devoted to the problem of resolving interference between parallel critical sections

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Database problems can be initially approached from two points of view There is the comprehensive view, in which the database is seen as a component of an overall system involving people, organizations, and communication; in contrast there is the microscopic view, in which the database is a collection of the hardware bits and bytes provided by computer technology In between these two extremes is subject matter of this book A database is viewed as a structured representation of data which describe a subset of the real world This representation is implemented using les, records, and references between these records Figure 1-6 presents the structure in the form of a pyramid to symbolize the breadth of the base required to obtain information

C/C++ supports multidimensional arrays The simplest form of the multidimensional array is the two-dimensional array A two-dimensional array is, essentially, an array of one-dimensional arrays To declare a two-dimensional integer array d of size 10,20, you would write

The technical aspects of database implementations can be discussed independently of the informational signi cance of the data value stored The fact that this book will only casually touch on the value of data is not intended to imply that people who actually implement information processing systems should ignore these considerations in their particular applications It is clearly irresponsible if computer professionals ignore the rami cations of the task at hand or their contribution to the social and human environment A number of textbooks deal with the proper use of information for business and governmental operations and decision making [Davis74 , DeGreene73 , Gotlieb73 , Westin71 ] This text also avoids subjects on the engineering side of the database domain, the design and construction of data storage devices Although the architecture and

SQL statements can be used stand-alone with a specialized editor, or embedded inside a computer program

Sec 1-3

performance of computer hardware is central to the evaluation of database systems, very little discussion of hardware-design alternatives will take place Obviously, familiarity with the hardware that provides the building blocks of computer systems is bene cial to the system developer Again, textbooks are available for the computer engineer at many levels of sophistication [Hill73 , Siewiorek82 ] A su ciently large body of material is available between these two extremes to keep us busy for some time Table 1-1 presents the various areas of discussion and places them in relationship to each other The table also lists some of the elds of study which provide background or further material appropriate to the levels presented The reader is not expected to be knowledgeable in all these areas; they are listed merely as navigational aids The term naming in the table is used to mean the creation of symbolic references to data with minimal concern as to location and form The term addressing is used to denote the exact speci cation of position and representation We see in Table 1-1 that as we descend to more primitive levels, naming is replaced more and more by addressing

int d[10][20];

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