• +
  A leading plus sign indicates that this word must be present in each row that is returned.
  
  
• -
  A leading minus sign indicates that this word must not be present in any of the rows that are returned.
  Note: The - operator acts only to exclude rows that are otherwise matched by other search terms. Thus, a boolean-mode search that contains only terms preceded by - returns an empty result. It does not return "all rows except those containing any of the excluded terms."
  
  
• ~
  A leading tilde acts as a negation operator, causing the word's contribution to the row's relevance to be negative. This is useful for marking "noise" words. A row containing such a word is rated lower than others, but is not excluded altogether, as it would be with the - operator.
  
  
• *
  The asterisk serves as the truncation (or wildcard) operator. Unlike the other operators, it should be appended to the word to be affected. Words match if they begin with the word preceding the * operator.
  
  
• (no operator)
  By default (when neither + nor - is specified) the word is optional, but the rows that contain it are rated higher.
  
  
• "
  A phrase that is enclosed within double quote ('"') characters matches only rows 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 rows that contain at least one of the two words.
  
  
• +apple +juice
  Find rows that contain both words.
  
  
• +apple macintosh
  Find rows that contain the word "apple", but rank rows higher if they also contain "macintosh".
  
  
• +apple -macintosh
  Find rows that contain the word "apple" but not "macintosh".
  
  
• +apple ~macintosh
  Find rows that contain the word "apple", but if the row also contains the word "macintosh", rate it lower than if row does not. This is "softer" than a search for '+apple -macintosh', for which the presence of "macintosh" causes the row not to be returned at all.
  
  
• apple*
  Find rows that contain words such as "apple", "apples", "applesauce", or "applet".
  
  
• "some words"
  Find rows that contain the exact phrase "some words" (for example, rows that contain "some words of wisdom" but not "some noise words"). Note that double quote (") characters that enclose the phrase are operator characters that delimit the phrase. They are not the quotes that enclose the search string itself.