User-Defined Logical Relationship in Visual Query
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Disclosed are 3 ways to define a UDLR (User Defined Logical Relationship). The basic logical operators in Predicate Logics are AND, OR and NOT (negation). In a SQL query statement, the logical relationships between predicates are normally described as logical AND or logical OR. When a certain pattern of logical relationships between a set of predicates occurs, the user has to define the pattern each time. This becomes annoying and is prone to errors when the same pattern is frequently used on different sets of predicates.