| BBIH Help - Table of contents | 2.4.3 Use AND, OR, NOT as Boolean operators | ||
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When you use AND in any field except Period covered, Year of publication, Subject tree and Place name tree it will be treated as a Boolean operator linking the words or phrases on either side of it. For example, searching for Crisis AND continuity in the Title contains field will find all records whose titles contain both the word 'crisis' and the word 'continuity', irrespective of the order in which they occur ('AND' has been shown in capitals here for clarity, but you do not have to type it this way). This has the same effect as typing crisis continuity because the 'AND' operator is assumed to be present between words by default. Different rules apply to Subject tree and Place name tree: learn more about subject tree or learn more about place name tree. You can also use OR to connect words when you want to find records that contain either word, e.g. Title contains crisis OR continuity will find records whose titles contain either the word 'crisis' or the word 'continuity'. Again, different rules apply to Subject tree and Place name tree: learn more about subject tree or learn more about place name tree. Use NOT to connect words when you want to find records that contain the first word or phrase, but not the second. To find a phrase that contains any of the words 'AND', 'OR' or 'NOT', place it in double inverted commas, e.g. "Crisis and continuity". You can mix 'AND', 'OR' and 'NOT' in one search and use brackets to control how these operators are used, e.g. Transport AND Gloucestershire OR Wiltshire finds all records that contain both 'Transport' and 'Gloucestershire' along with all records that contain 'Wiltshire' BUT Transport AND (Gloucestershire OR Wiltshire) finds all records that contain both 'Transport' and either 'Gloucestershire' or 'Wiltshire', which is probably a more useful result. On the Advanced search screen you can also select different Boolean operators between fields (learn more: 2.2). |