![]() Because this derived predicate is not subsumed by Q2's query condition, the system suspects that the user may not know of it and presents it to the user.ĭerived predicates, together with user-selected ones, constrain the user's further conjunctive extension of the partial query condition. With the replacement of rule variable p in IC by Q2's range variable p#1, IC's leading two predicates subsume Q2's query condition, producing p#1 rank = 'Assistant'. This rules states that a CS professor whose salary is less than 45000 is an assistant professor. Suppose that the system has an integrity constraint FROM professor p IF p dept = 'CS' AND p salary < 45000 THEN p rank = 'Assistant' To illustrate this, consider a partially constructed SQL query SELECT * FROM professor p#1 WHERE p#1 dept = 'CS' AND p#1 salary < 40000 It informs the user of any derived predicates on the completion of a user-selected predicate. ![]() The system provides additional guidance for users to avoid creating semantically inconsistent queries. With Kaleidoscope's process of choice generation tightly controlled by the system's knowledge of query language and underlying data, users need not remember the query language and the underlying database structure but merely recognize or identify the constituents coming one after another that match their intended query. To guide the user's entry of values, the system provides a pop-up menu for each value domain. If a choice is unique as in (3+), it is taken automatically. For instance, it takes four steps to create the following query Who/ 1 authored/ 2 'Al'/ 3 journal papers/ (3+) in 'Postquery COOP'/ 4Īt each of such steps, as the user selects one of menu choices, the system updates its partial query status window. The system generates valid query constituents as menu choices step-by-step by interpreting a language grammar, and the user creates a query following this menu guidance. To enable this early, active engagement in the user's process of query creation, Kaleidoscope reduces the granularity of user-system interaction via a context-sensitive menu. We call this type of cooperative behavior intraquery guidance. Kaleidoscope is a cooperative query interface whose knowledge guides users to avoid most failure during query creation. These may include spelling mistakes, the violation of the syntax and semantics of a query language, and the misconception of the entities and relationships in a database. However, because the knowledge in human long-term memory is imprecise, incomplete, and often incorrect, user queries are subject to various types of failure. Hard Rock Cafe rocks your student group.Querying databases to obtain information requires the user's knowledge of query language and underlying data. Don’t forget to make a quick stop at the Hard Rock Shop for those all- important t-shirts! There’s much to see to keep the kids occupied, and the music is always pumping, keeping the energy of the trip high. While your group is in the house, they can browse the huge and varied collection of authentic rock and roll memorabilia. If you prefer alternative choices, they’ll work with you to design a menu that will perfectly satisfy the needs of your group. The portions are monstrous (perfect for teens) and each meal is topped off with a warm and fully-loaded chocolate chip cookie. They cater to groups of 15 or more and can offer a dedicated menu- including those legendary burgers, golden, breaded chicken tenders, gooey mac and cheese, smoky pulled pork or a classic Caesar salad. Hard Rock Cafe is a master at knowing what kids like, from colossal, mouthwatering burgers to the sights and sounds of rock and roll! Hard Rock Cafe has tons of locations in great student destinations, each with a unique flavor and style. Hard Rock Cafe rocks your student groupĮnter Hard Rock Cafe, the perfect dining destination for your student group. I do know, however, that if teenagers are well-fed and given a chance to kick back with some great music, they are ultimately happy campers. I went from weekly grocery shopping to what feels like hourly grocery shopping in the span of two short years! Conversely, I have no idea what is on his playlist (and prefer to keep it that way). I happen to have a teenager (of the male variety) and I can verify that music and eating top his daily to do list. Teenagers love two things: music and eating.
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