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What ia a constraints?

Updated: 9/21/2023
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What is the difference between constraints and criteria?

A constraint has a limit as for criteria: to end a loop Excel Questions


What is the Distinction between condition defined and user defined constraints which of these constraints can system check?

In a generalization-specialization hierarchy, it must be possible to decide which entities are members of which lower level entity sets. In a conditiondefined design constraint, membership in the lower level entity-sets is evaluated on the basis of whether or not an entity satisfies an explicit condition or predicate.User-defined lower-level entity sets are not constrained by a membership condition; rather, entities are assigned to a given entity set by the database user. Condition-defined constraints alone can be automatically handled by the system. Whenever any tuple is inserted into the database, its membership in the various lower level entity-sets can be automatically decided by evaluating the respective membership predicates. Similarly when a tuple is updated, its membership in the various entity sets can be re-evaluated automatically


What is the difference between thousand barrels per calendar day mbcd and thousands barrels per operating day mbod?

Barrels per calendar day: The amount of input that a distillation facility can process under usual operating conditions. The amount is expressed in terms of capacity during a 24-hour period and reduces the maximum processing capability of all units at the facility under continuous operation to account for the following limitations that may delay, interrupt, or slow down production. 1. the capability of downstream processing units to absorb the output of crude oil processing facilities of a given refinery. No reduction is necessary for intermediate streams that are distributed to other than downstream facilities as part of a refinery's normal operation; 2. the types and grades of inputs to be processed; 3. the types and grades of products expected to be manufactured; 4. the environmental constraints associated with refinery operations; 5. the reduction of capacity for scheduled downtime due to such conditions as routine inspection, maintenance, repairs, and turnaround; and 6. the reduction of capacity for unscheduled downtime due to such conditions as mechanical problems, repairs, and slowdowns.Barrels per stream day: The maximum number of barrels of input that a distillation facility can process within a 24-hour period when running at full capacity under optimal crude and product slate conditions with no allowance for downtime.From U.S. Energy Information Administration


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Constraints are sort of restrictions, which restrict the data that can be stored in a relation (Table). or Constraints are mostly a collection of indexes and triggers that restrict certain actions on a table. There are four types of constraints: Primary Key ConstraintsUnique ConstraintsCheck ConstraintsForeign Key (FK) Constraints. - chandrabhan


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