Operator Description
+ The word following is mandatory and must be present in every row returned.
- The word following is prohibited and must not be present in any row returned.
< The word following has a lower relevance than other words.
> The word following has a higher relevance than other words.
( ) Used to group words in subexpressions.
~ The word following makes a negative contribution to the row relevance (this is not the same as the - operator, which excludes the row altogether if the word is found, or as the < operator, which still assigns a positive, though lower, relevance to the word).
* The wildcard, indicating zero or more characters. It can only appear on the end of a word.
" Anything enclosed in double quotes is taken as a whole.