| 摘要 |
A computer system includes a graphical user interface, which enables a user to create and update a database query in a simple manner. The interface displays logic conditions within nested graphical containers (e. g. boxes) representing nested boolean AND and OR expressions. Containers and conditions may be dragged around to modify the logic. New containers may be created within existing containers. New conditions may be created within existing containers, by selecting a condition type from a predetermined list of condition types, and then entering details specific to the selected type. The query is used to access the database, so as to identify a subset of records that satisfy the query, and to display those records to the user.
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