from instructor - Computer Engineering Department
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints ...
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints ...
ppt
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints ...
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints ...
ppt
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints ...
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints ...
Squid Lab - National Aquarium
... rather than outside. The octopus, on the other hand, has lost its shell completely. All of the cephalopods are marine animals and all are carnivores. While cephalopods appear to be very different from other classes of molluscs, they have the same basic body plan. All molluscs have a soft body with a ...
... rather than outside. The octopus, on the other hand, has lost its shell completely. All of the cephalopods are marine animals and all are carnivores. While cephalopods appear to be very different from other classes of molluscs, they have the same basic body plan. All molluscs have a soft body with a ...
Chapter 2: Relational Model
... 2. The attribute domains must be compatible (example: 2nd column of r deals with the same type of values as does the 2nd column of s) ■ Example: to find all customers with either an account or a loan ...
... 2. The attribute domains must be compatible (example: 2nd column of r deals with the same type of values as does the 2nd column of s) ■ Example: to find all customers with either an account or a loan ...
Chapter 2: Relational Model
... A basic expression in the relational algebra consists of either one of the ...
... A basic expression in the relational algebra consists of either one of the ...
Document
... BCNF and Dependency Preservation Constraints, including functional dependencies, are costly to check in ...
... BCNF and Dependency Preservation Constraints, including functional dependencies, are costly to check in ...
Document
... 1. For each data item Q, if transaction Ti reads the initial value of Q in schedule S, then transaction Ti must, in schedule S´, also read the initial value of Q. 2. For each data item Q if transaction Ti executes read(Q) in schedule S, and that value was produced by transaction Tj (if any), then tr ...
... 1. For each data item Q, if transaction Ti reads the initial value of Q in schedule S, then transaction Ti must, in schedule S´, also read the initial value of Q. 2. For each data item Q if transaction Ti executes read(Q) in schedule S, and that value was produced by transaction Tj (if any), then tr ...
6. RECOMPILE INVALID OBJECTS
... The list of invalid SYS/SYSTEM objects was written to registry$sys_inv_objs. The list of non-SYS/SYSTEM objects was written to registry$nonsys_inv_objs unless there were over 5000. Use utluiobj.sql after the upgrade to identify any new invalid objects due to the upgrade. ...
... The list of invalid SYS/SYSTEM objects was written to registry$sys_inv_objs. The list of non-SYS/SYSTEM objects was written to registry$nonsys_inv_objs unless there were over 5000. Use utluiobj.sql after the upgrade to identify any new invalid objects due to the upgrade. ...
mod-9
... 2. To specify constraints on the set of legal relations. We shall thus concern ourselves only with relations that satisfy a given set of functional and multivalued dependencies. If a relation r fails to satisfy a given multivalued dependency, ...
... 2. To specify constraints on the set of legal relations. We shall thus concern ourselves only with relations that satisfy a given set of functional and multivalued dependencies. If a relation r fails to satisfy a given multivalued dependency, ...
Indexing and Hashing
... catalog, and a card in the catalog tells us where to find the book. To assist us in searching the catalog, the library would keep the cards in alphabetic order by authors, with one card for each author of each book. Database system indices play the same role as book indices or card catalogs in librar ...
... catalog, and a card in the catalog tells us where to find the book. To assist us in searching the catalog, the library would keep the cards in alphabetic order by authors, with one card for each author of each book. Database system indices play the same role as book indices or card catalogs in librar ...
Here - NYU Computer Science Department
... matters) tree such that: • All paths from root to leaves are of same length • Each node (other than leaves) has between 2 and 3 children. For each child, other than the last there is an index value • For each non-leaf node, the index value indicates the largest value of the leaf in the subtree roote ...
... matters) tree such that: • All paths from root to leaves are of same length • Each node (other than leaves) has between 2 and 3 children. For each child, other than the last there is an index value • For each non-leaf node, the index value indicates the largest value of the leaf in the subtree roote ...
Chapter 5: Other Relational Languages
... ( u branch (u [branch_city ] = “Brooklyn” s depositor (t [customer_name ] = s [customer_name ] w account ( w[account_number ] = s [account_number ] ...
... ( u branch (u [branch_city ] = “Brooklyn” s depositor (t [customer_name ] = s [customer_name ] w account ( w[account_number ] = s [account_number ] ...
Chapter 13: Query Processing
... Versão modificada de Database System Concepts, 5th Ed. ©Silberschatz, Korth and Sudarshan ...
... Versão modificada de Database System Concepts, 5th Ed. ©Silberschatz, Korth and Sudarshan ...
ppt
... ( u branch (u [branch_city ] = “Brooklyn” s depositor (t [customer_name ] = s [customer_name ] w account ( w[account_number ] = s [account_number ] ...
... ( u branch (u [branch_city ] = “Brooklyn” s depositor (t [customer_name ] = s [customer_name ] w account ( w[account_number ] = s [account_number ] ...
PPT
... must equal value of cash-in-hand A transaction must see a consistent database. During transaction execution the database may be temporarily inconsistent. When the transaction completes successfully the database must be ...
... must equal value of cash-in-hand A transaction must see a consistent database. During transaction execution the database may be temporarily inconsistent. When the transaction completes successfully the database must be ...
ppt
... We define additional operations that do not add any power to the relational algebra, but that simplify common queries. ...
... We define additional operations that do not add any power to the relational algebra, but that simplify common queries. ...
ppt - FCN
... We define additional operations that do not add any power to the relational algebra, but that simplify common queries. ...
... We define additional operations that do not add any power to the relational algebra, but that simplify common queries. ...
Chs. 1 + 2
... If a new dept. is created, then a new file is needed, to store info about all the instructors in that dept. ...
... If a new dept. is created, then a new file is needed, to store info about all the instructors in that dept. ...
Ch.8 - Faculty Website Listing
... Constraints, including FDs, are costly to check in practice unless they pertain to only one relation. If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency pre ...
... Constraints, including FDs, are costly to check in practice unless they pertain to only one relation. If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency pre ...
Chapter 7: Relational Database Design
... The precedence graph test for conflict serializability cannot be used ...
... The precedence graph test for conflict serializability cannot be used ...
ppt
... If selection is on a key attribute, can stop on finding record cost = (br /2) block transfers + 1 seek Linear search can be applied regardless of selection condition or ordering of records in the file, or availability of indices ...
... If selection is on a key attribute, can stop on finding record cost = (br /2) block transfers + 1 seek Linear search can be applied regardless of selection condition or ordering of records in the file, or availability of indices ...