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Beginning with Access 2002, the SQL:2003 pattern-matching characters can be used by specifying ANSI 92 query mode in the Options window Since earlier Access versions do not support this option and this option is not default in Access 2002, the textbook uses the * and pattern-matching characters for Access SQL statements Most DBMSs require single quotes, the SQL:2003 standard Microsoft Access allows either single or double quotes for string constants

DECLARE height ONE OF { <150cm, 150-154cm, 155-159cm, 160-164cm, , >189cm } If continuous variables are used at low levels, so that these rings area reasonably small, then the rings need not be broken A simple ordering within the ring will aid access Ordering of members of a ring is frequently used 3-6-2 Use of Multiring Files The concept of related master and detail records can be traced to traditional dataprocessing procedures Multiring structures are the basis for some of the largest databases currently in use Management information systems where much of the system operation involves tabulating, summarizing, and exception reporting have been implemented using these multilinked lists Examples of such operations were shown in the introduction to this section Some problems in geographic and architectural space representation also have been approached with a multiring approach Current developments in integrated multi le systems depend greatly on the capabilities provided by ring structures A problem with the multiring structure is that a careful design based on prior knowledge of the data and usage pattern is required before a multiring le can be implemented Ring structures have been implemented in practice with a number of important additional features We will mention several of these in Chap 4; they all will make the analysis of le performance more complex

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3-6-3 Performance of Multiring Files The performance of a multiring system depends greatly on the suitability of the attribute assignments to particular rings In the evaluation below, we will assume that the le structure is optimally matched to the usage requirements We will analyze the performance for access to lowest level records in a hierarchy of rings Each record can be adequately identi ed when accessed, so that no tracing from a candidate goal record to its header records is required The record formats are xed within a record type In each record, there will be a xed number of data and linkage elds, denoted as adata and alink , respectively We also assume an ideal partitioning of the le by the attributes, so that the rings on the various levels are of equal size We neglect bene ts to be gained by locality management of the rings, or clustering The e ects of these two factors may balance each other Since many distinct record types will exist in a multiring le, an accurate estimate is obtained only by listing all types, with their respective frequency and size

BETWEEN-AND operator a shortcut operator to test a numeric or date column against a range of values The BETWEEN-AND oper ator returns true if the column is greater than or equal to the first value and less than or equal to the second value

We wish to avoid these null entries because of the storage cost, and even more because of the processing cost incurred when fetching and rejecting empty elds The hierarchical structure provides a method to achieve compact storage

Remember, q is not a pointer to integers, but rather a pointer to an array of pointers to integers Therefore you need to declare the parameter q as an array of integer pointers, as just shown You cannot declare q simply as an integer pointer because that is not what it is Pointer arrays are often used to hold pointers to strings You can create a function that outputs an error message given its code number, as shown here:

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