|
|
Help: Searching the Medical Palm Review
The boolean full-text search capability supports the following operators:
| + | A leading plus sign indicates that this word must be present in every result returned. |
| - | A leading minus sign indicates that this word must not be present in any result returned. |
By default (when neither plus nor minus is specified) the word is optional, but the results that contain it will be rated higher.
| > < | These two operators are used to change a word's contribution to the relevance value that is assigned to a result. The > operator
increases the contribution and the < operator decreases it. See the example below. |
| ( ) | Parentheses are used to group words into subexpressions. Parenthesized groups can be nested. |
| ~ | A leading tilde acts as a negation operator, causing the word's contribution to the result relevance to be negative. It's useful for marking noise
words. A result that contains such a word will be rated lower than others, but will not be excluded altogether, as it would be with the - operator. |
| * | An asterisk is the truncation operator. Unlike the other operators, it should be appended to the word, not prepended. |
| " | A phrase that is enclosed within double quote (`"') characters matches only results that contain the phrase literally, as it was typed. |
The following examples demonstrate some search strings that use boolean full-text operators:
| apple banana | Find results that contain at least one of the two words. |
| +apple +juice | Find results that contain both words. |
| +apple macintosh | Find results that contain the word ``apple'', but rank them higher if they also contain ``macintosh''. |
| +apple -macintosh | Find results that contain the word ``apple'' but not ``macintosh''. |
| +apple +(>turnover <strudel) | Find results that contain the words ``apple'' and ``turnover'', or ``apple'' and ``strudel'' (in any order),
but rank ``apple turnover'' higher than ``apple strudel''. |
| apple* | Find results that contain words such as ``apple'', ``apples'', ``applesauce'', or ``applet''. |
| "some words" | Find results that contain the exact phrase ``some words'' (for example, results that contain ``some words of wisdom'' but not ``some
noise words''). Note that the `"' characters that surround the phrase are included within the search string. Single quotes are ignored. |
|
|