Relative Operators

Relative operators are symbols that compare search terms:

*Symbol*	*Relative Operation*
=	Equal to search term
<>	Not equal to a single search term: PD <> 1970 For a range of dates, use NOT: NOT PD = 1970-1980.
>=	Greater than or equal to search term
>	Greater than search term
<=	Less than or equal to search term
<	Less than search term

Example:
PD >= 1987
This example finds items published in or after 1987. PD specifies the publication date access point. See Search Access Point (Field) Codes for access point codes.

Example:
KW=solar system AND PD < 1932
This example finds items published before 1932 that have the words “solar system” in any record field. KW specifies the keyword access point. See Search Access Point (Field) Codes for access point codes.