Database design, and information storage and retrieval

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ICT for Library and Information Professionals: A Training Package for Developing Countries Student’s Guide 5 BRACKETS (PARENTHESES) can be used in more complicated searches such as ”AGRICULTURE or SOIL in ASIA or AFRICA”. Search expression: AGRICULTURE + SOIL * ASIA + AFRICA This will first combine soil * asia and then all items about agriculture and africa. To avoid this you can use: Search expression: (AGRICULTURE + soil ) * (ASIA + AFRICA) 6 FIELD IDENTIFIER can be used to search a term in a particular field. Search expression: BIOLOGY/(69) You can also specify more than one field such as: Search expression: BIOLOGY/(69,24) 7 FREE TEXT SEARCHING can be used for the terms in the fields, which are not indexed using FST. Search expression: ? v26: 'unesco' This will search for records where field 26 contains the word “unesco”. You could also look for more than one word or part of a word. You can also use this for a previous search. If search set 5, comprising records dealing with education, has already been created Search expression: ? #5 v26: 'unesco' will retrieve the records about education published by Unesco (note that upper and lower case letters, like the “u” in Unesco, are treated as being identical). Other operators apart from : can be used. Eg. = If the title is indexed using IT 4 then if you search (search set 6) for a journal title “SCIENCE”, all titles with the word “SCIENCE” will be retrieved. Then you can use the operator = to search for the journal. Search expression: ? #6 v24= 'science' This means the title must be equal to “SCIENCE” only. It is also possible to use the operators > (greater than) < (less than) Search expression: ? v26 >'1976' will retrieve records published after 1976 Search expression: Module 4: Database Design, and Information Storage and Retrieval: Annex 02 Page X of XV
ICT for Library and Information Professionals: A Training Package for Developing Countries Student’s Guide ? val(v26)=1976 will retrieve the records published in 1976. This method of searching can be used to find whether data are available or not in a given field. For this functions a or p may be used. Search expression: ? a(v12) This will retrieve records, which do not have data in field 12. Search expression: ? p(v12) This will retrieve records, which have data in field 12. These can be combined like other search terms. Search expression: ? p(v12) * a(v70) Module 4: Database Design, and Information Storage and Retrieval: Annex 02 Page XI of XV
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