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Chapter 4
... • Cardinality – Expresses minimum and maximum number of entity occurrences associated with one occurrence of related entity ...
... • Cardinality – Expresses minimum and maximum number of entity occurrences associated with one occurrence of related entity ...
MOLLUSCA: GASTROPODA
... in the limpets, family Ancylidae, with new shell material secreted at the margin. Second, the shell can be planospiral (with the whorls all in one plane), as in the pulmonate family Planorbidae (Fig. 2B). Whorls may be elevated into a “spire,” as in the pulmonate families Physidae and Lymnaeidae, an ...
... in the limpets, family Ancylidae, with new shell material secreted at the margin. Second, the shell can be planospiral (with the whorls all in one plane), as in the pulmonate family Planorbidae (Fig. 2B). Whorls may be elevated into a “spire,” as in the pulmonate families Physidae and Lymnaeidae, an ...
Mollusks Annelids
... with a number of round sucking disks that are used to grab and hold fish and other prey. In addition to these tentacles, cuttle¬ fish and squids also have two long, slender arms with suckers on the end. Nautiluses have many more tentacles (38 to 90) than other cephalopods. Their tentacles lack sucke ...
... with a number of round sucking disks that are used to grab and hold fish and other prey. In addition to these tentacles, cuttle¬ fish and squids also have two long, slender arms with suckers on the end. Nautiluses have many more tentacles (38 to 90) than other cephalopods. Their tentacles lack sucke ...
Document
... number of tuples, number of distinct values for an attribute Statistics estimation for intermediate results to compute cost of complex expressions Cost formula for algorithms (Ch12), computed using statistics Database System Concepts - 6th Edition ...
... number of tuples, number of distinct values for an attribute Statistics estimation for intermediate results to compute cost of complex expressions Cost formula for algorithms (Ch12), computed using statistics Database System Concepts - 6th Edition ...
characteristics of insects and other terrestrial arthropods
... Much of the color of reef corals is usually created not by the coral itself, but by the various species of zooxanthellae, which typically range from yellow, to brown, and green. The few species with bright colors such as red, orange and yellow generally do not harbor zooxanthellae. All hard corals, ...
... Much of the color of reef corals is usually created not by the coral itself, but by the various species of zooxanthellae, which typically range from yellow, to brown, and green. The few species with bright colors such as red, orange and yellow generally do not harbor zooxanthellae. All hard corals, ...
Chapter 14: Query Optimization
... may not yield best overall algorithm. E.g. merge-join may be costlier than hash-join, but may provide a sorted output which reduces the cost for an ...
... may not yield best overall algorithm. E.g. merge-join may be costlier than hash-join, but may provide a sorted output which reduces the cost for an ...
LECTURES FOR ZOO 1010—CHAPTER 1
... Body plan—The body plan of mollusks consists of a head-foot and a visceral mass. The head is the location of the feeding apparatus and the major sensory structures, such as photosensory receptors, including the complex eyes of cephalopods, and tentacles. Within the mouth, there is often found a feed ...
... Body plan—The body plan of mollusks consists of a head-foot and a visceral mass. The head is the location of the feeding apparatus and the major sensory structures, such as photosensory receptors, including the complex eyes of cephalopods, and tentacles. Within the mouth, there is often found a feed ...
Chapter 7: Relational Database Design
... Several algorithms can reduce disk IO by using extra buffer ...
... Several algorithms can reduce disk IO by using extra buffer ...
Secondary Index
... The data file is ordered on a non-key field unlike primary index, which requires that the ordering field of the data file have a distinct value for each record. Includes one index entry for each distinct value of the field; the index entry points to the first data block that contains records with th ...
... The data file is ordered on a non-key field unlike primary index, which requires that the ordering field of the data file have a distinct value for each record. Includes one index entry for each distinct value of the field; the index entry points to the first data block that contains records with th ...
Chapter 14: Query Optimization
... ntakes = 10,000 ftakes = 25, which implies that btakes = 10000/25 = 400 ...
... ntakes = 10,000 ftakes = 25, which implies that btakes = 10000/25 = 400 ...
Chapter 14: Query Optimization
... merge-join may be costlier than hash-join, but may provide a sorted output which reduces the cost for an outer level ...
... merge-join may be costlier than hash-join, but may provide a sorted output which reduces the cost for an outer level ...
Appendix B-The Network Model
... many-to-many relationship, we create a new record type, called an intersection record or a link record, consisting of just the keys of the associated records, plus any intersection information, that is, any descriptive attributes whose values depend on the association. Consider the model shown in Fi ...
... many-to-many relationship, we create a new record type, called an intersection record or a link record, consisting of just the keys of the associated records, plus any intersection information, that is, any descriptive attributes whose values depend on the association. Consider the model shown in Fi ...
Chapter 14: Query Optimization
... If only left-deep trees are considered, time complexity of finding best join order is O(n 2n) Space complexity remains at O(2n) Cost-based optimization is expensive, but worthwhile for queries on large datasets (typical queries have small n, generally < 10) ...
... If only left-deep trees are considered, time complexity of finding best join order is O(n 2n) Space complexity remains at O(2n) Cost-based optimization is expensive, but worthwhile for queries on large datasets (typical queries have small n, generally < 10) ...
Document
... squids Architeuthis harveyi (Gr. archi, primitive, + teuthis, squid). The body of this huge species may grow up to 18 m long with tentacles extended. It may weigh up to 454 kg (1000 pounds). The shells of some giant clams Tridacna gigas (Gr. tridaknos, eaten at three bites) (see figure 10.21), which ...
... squids Architeuthis harveyi (Gr. archi, primitive, + teuthis, squid). The body of this huge species may grow up to 18 m long with tentacles extended. It may weigh up to 454 kg (1000 pounds). The shells of some giant clams Tridacna gigas (Gr. tridaknos, eaten at three bites) (see figure 10.21), which ...
Phylum Mollusca
... • Nephridia (nih FRIH dee uh) are organs that remove metabolic wastes from an animal’s body. • Mollusks have one or two nephridia that collect wastes from the coelom, which is located around the heart only. • Wastes are discharged into the mantle cavity, and expelled from the body by the pumping of ...
... • Nephridia (nih FRIH dee uh) are organs that remove metabolic wastes from an animal’s body. • Mollusks have one or two nephridia that collect wastes from the coelom, which is located around the heart only. • Wastes are discharged into the mantle cavity, and expelled from the body by the pumping of ...
Database Systems: Design, Implementation, and Management
... • Specifies the tables from which the data will be drawn • Can use SELECT subquery in the FROM clause – View name can be used anywhere a table is expected ...
... • Specifies the tables from which the data will be drawn • Can use SELECT subquery in the FROM clause – View name can be used anywhere a table is expected ...
phylum mollusca
... Clams and their bivalve relatives are one of only a few mollusc classes found in both freshwater and marine environments. In both places they're specialized as filter feeders, and like most filter feeders they're essentially sessile. To accommodate their way of life, bivalves have made some major mo ...
... Clams and their bivalve relatives are one of only a few mollusc classes found in both freshwater and marine environments. In both places they're specialized as filter feeders, and like most filter feeders they're essentially sessile. To accommodate their way of life, bivalves have made some major mo ...
Normalization
... of normalization is to ensure that all tables are in at least 3NF Higher forms are not likely to be encountered in business environment Normalization works one relation at a time Progressively breaks table into new set of relations based on identified dependencies Database Systems, 9th Edition ...
... of normalization is to ensure that all tables are in at least 3NF Higher forms are not likely to be encountered in business environment Normalization works one relation at a time Progressively breaks table into new set of relations based on identified dependencies Database Systems, 9th Edition ...
Slides for Ch-13
... Retrieve multiple records if search-key is not a candidate key each of n matching records may be on a different block Cost = (hi + n) * (tT + tS) – Can be very expensive! ...
... Retrieve multiple records if search-key is not a candidate key each of n matching records may be on a different block Cost = (hi + n) * (tT + tS) – Can be very expensive! ...
DBInt2-Indexing
... Using separate indices in less efficient — we may fetch many records (or pointers) that satisfy only one of the conditions. ...
... Using separate indices in less efficient — we may fetch many records (or pointers) that satisfy only one of the conditions. ...
PPT - Electrical and Computer Engineering Department
... Department of Electrical and Computer Engineering University of Puerto Rico, Mayagüez Slides are adapted from: Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
... Department of Electrical and Computer Engineering University of Puerto Rico, Mayagüez Slides are adapted from: Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...