Parallel Database
... Parallel Databases- Implementation Parallel Dataflow Approach To SQL Software SQL data model was originally proposed to improve programmer productivity by offering a nonprocedural database language. SQL came with Data Independence since the programs do not specify how the query is to be execute ...
... Parallel Databases- Implementation Parallel Dataflow Approach To SQL Software SQL data model was originally proposed to improve programmer productivity by offering a nonprocedural database language. SQL came with Data Independence since the programs do not specify how the query is to be execute ...
Introduction to Techniques of Query Processing and
... Table DEPT is accessed before filtering out all tuples with a department value more or equal to 1000. The resulting set of tuples is the outer input stream for the nested-loop join operator. The inner input stream is generated b first accessing the D_INDEX using the join predicate before retrieving ...
... Table DEPT is accessed before filtering out all tuples with a department value more or equal to 1000. The resulting set of tuples is the outer input stream for the nested-loop join operator. The inner input stream is generated b first accessing the D_INDEX using the join predicate before retrieving ...
Object-Relational Mapping with Hibernate and JPA
... The Object-Oriented Paradigm The world consists of objects So we use object-oriented languages to write applications We want to store some of the application objects (a.k.a. persistent objects) So we use a Object Database? ...
... The Object-Oriented Paradigm The world consists of objects So we use object-oriented languages to write applications We want to store some of the application objects (a.k.a. persistent objects) So we use a Object Database? ...
Introduction to MySQL RDBMS
... Primary and related table definition is always between two tables which have a relationship between them. For example the tables Car and CarType have a relationship. The foreign key (model_id) of the Car table refers to the CarType table primary key (model_id). The CarType table is the primary table ...
... Primary and related table definition is always between two tables which have a relationship between them. For example the tables Car and CarType have a relationship. The foreign key (model_id) of the Car table refers to the CarType table primary key (model_id). The CarType table is the primary table ...
Computer Networks
... SQL has one basic statement for retrieving information from a database; the SELECT statement This is not the same as the SELECT operation of the relational algebra Important distinction between SQL and the formal relational model; SQL allows a table (relation) to have two or more tuples that are ide ...
... SQL has one basic statement for retrieving information from a database; the SELECT statement This is not the same as the SELECT operation of the relational algebra Important distinction between SQL and the formal relational model; SQL allows a table (relation) to have two or more tuples that are ide ...
Physical Database Design
... – Physical placement of data • Use of container • Can improve performance without impacting logical design – Selective hardware upgrades • More main memory, expanded storage, cache storage devices ...
... – Physical placement of data • Use of container • Can improve performance without impacting logical design – Selective hardware upgrades • More main memory, expanded storage, cache storage devices ...
Chapter 8
... JOIN USING Clause • Returns only rows with matching values in the column indicated in the USING clause • Syntax: SELECT column-list FROM table1 JOIN table2 USING (common-column) ...
... JOIN USING Clause • Returns only rows with matching values in the column indicated in the USING clause • Syntax: SELECT column-list FROM table1 JOIN table2 USING (common-column) ...
System R: Relational Approach to Database Management
... (2) Since the query is asymmetrically expressed,the optimizer is biased toward making an outer loop for the first block and an inner loop for the second block. Since this may not be the optimum method for interpreting the query, the optimization processis made difficult. (3) Human factors studies ha ...
... (2) Since the query is asymmetrically expressed,the optimizer is biased toward making an outer loop for the first block and an inner loop for the second block. Since this may not be the optimum method for interpreting the query, the optimization processis made difficult. (3) Human factors studies ha ...
System R: Relational Approach to Database Management
... (2) Since the query is asymmetrically expressed,the optimizer is biased toward making an outer loop for the first block and an inner loop for the second block. Since this may not be the optimum method for interpreting the query, the optimization processis made difficult. (3) Human factors studies ha ...
... (2) Since the query is asymmetrically expressed,the optimizer is biased toward making an outer loop for the first block and an inner loop for the second block. Since this may not be the optimum method for interpreting the query, the optimization processis made difficult. (3) Human factors studies ha ...
Py4Inf-14-Database
... Relational databases allow us to scale to very large amounts of data The key is to have one copy of any data element and use relations and joins to link the data to multiple places This greatly reduces the amount of data which much be scanned when doing complex operations across large amounts of dat ...
... Relational databases allow us to scale to very large amounts of data The key is to have one copy of any data element and use relations and joins to link the data to multiple places This greatly reduces the amount of data which much be scanned when doing complex operations across large amounts of dat ...
Kite - Pages - University of Wisconsin
... Exhaustively extract all answers from a CN (fully materialize S) too much data to move around the network (data transfer cost) ...
... Exhaustively extract all answers from a CN (fully materialize S) too much data to move around the network (data transfer cost) ...
More SQL
... Product(name, category) Purchase(prodName, month, store) SELECT Product.name, count(*) FROM Product LEFT OUTER JOIN Purchase ON Product.name = Purchase.prodName and Purchase.month = ‘September’ GROUP BY Product.name Now we also get the products who sold in 0 quantity ...
... Product(name, category) Purchase(prodName, month, store) SELECT Product.name, count(*) FROM Product LEFT OUTER JOIN Purchase ON Product.name = Purchase.prodName and Purchase.month = ‘September’ GROUP BY Product.name Now we also get the products who sold in 0 quantity ...
CIS560-Lecture-01-20070116 - KDD
... Excerpts from Database System Concepts, 5e © 2005 Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use CIS 560: Database System Concepts ...
... Excerpts from Database System Concepts, 5e © 2005 Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use CIS 560: Database System Concepts ...
access control
... A can create a view V of R that includes only those attributes and then grant SELECT on V to B. The same applies to limiting B to retrieving only certain tuples of R; a view V’ can be created by defining the view by means of a query that selects only those tuples from R that A wants to allow B ...
... A can create a view V of R that includes only those attributes and then grant SELECT on V to B. The same applies to limiting B to retrieving only certain tuples of R; a view V’ can be created by defining the view by means of a query that selects only those tuples from R that A wants to allow B ...
slide-04 - Informatika
... • A set of attributes of a relation is a superkey if it functionally determines all the attributes of the relation • A superkey is a candidate key if none of its subsets is a superkey ...
... • A set of attributes of a relation is a superkey if it functionally determines all the attributes of the relation • A superkey is a candidate key if none of its subsets is a superkey ...
SQL Introduction
... • Structured Query Language (SQL) is an industrystandard language used for creating, updating and querying relational databases • SQL operations are based on relational algebra that underlies relational database design • SQL is a 4th Generation non-procedural language (whereas C and COBOL are 3rd ge ...
... • Structured Query Language (SQL) is an industrystandard language used for creating, updating and querying relational databases • SQL operations are based on relational algebra that underlies relational database design • SQL is a 4th Generation non-procedural language (whereas C and COBOL are 3rd ge ...
Physical Database Design
... The next step is to choose indexes, make clustering decisions, and to refine the conceptual and external schemas (if necessary) to meet performance goals. We must begin by understanding the workload: – The most important queries and how often they arise. – The most important updates and how often th ...
... The next step is to choose indexes, make clustering decisions, and to refine the conceptual and external schemas (if necessary) to meet performance goals. We must begin by understanding the workload: – The most important queries and how often they arise. – The most important updates and how often th ...
Chapter 8 - cda college
... – SQL statement is not known in advance, but instead is generated at run time – Program can generate SQL statements at run time that are required to respond to ad hoc queries – Attribute list and condition are not known until end user specifies them – Tends to be much slower than static SQL – Requir ...
... – SQL statement is not known in advance, but instead is generated at run time – Program can generate SQL statements at run time that are required to respond to ad hoc queries – Attribute list and condition are not known until end user specifies them – Tends to be much slower than static SQL – Requir ...
No Slide Title - Department of Computer Science
... 4.Know the characteristics of superkey, candidate key, primary key, and foreign key. 5.Know the rules of relational integrity and referential integrity. 6. Be able to recognize and read relational algebra statements with the primary operators. 7.Be able to recognized simple relational calculus state ...
... 4.Know the characteristics of superkey, candidate key, primary key, and foreign key. 5.Know the rules of relational integrity and referential integrity. 6. Be able to recognize and read relational algebra statements with the primary operators. 7.Be able to recognized simple relational calculus state ...
Document
... possibly have the same name. In other words: any two tuples that are equal on K are equal (identical on all fields) K is a candidate key if K is minimal Example: {customer-name} is a candidate key for Customer, since it is a superkey {assuming no two customers can possibly have the same name), a ...
... possibly have the same name. In other words: any two tuples that are equal on K are equal (identical on all fields) K is a candidate key if K is minimal Example: {customer-name} is a candidate key for Customer, since it is a superkey {assuming no two customers can possibly have the same name), a ...
StudentID
... to copy the query design and then paste it into a word processing application) and also print out the query result (you can use the File, Print menu to print the result). Be sure to label the printouts and put your name on your assignment. a. Marketing wants to know whether more childrens’ fiction b ...
... to copy the query design and then paste it into a word processing application) and also print out the query result (you can use the File, Print menu to print the result). Be sure to label the printouts and put your name on your assignment. a. Marketing wants to know whether more childrens’ fiction b ...
Introduction to SQL
... description of a database Schema - the structure that contains descriptions of objects created by a user (base tables, views, constraints) Data Definition Language (DDL) - commands that define a database, including creating, altering, and dropping tables and establishing constraints Data Manipulatio ...
... description of a database Schema - the structure that contains descriptions of objects created by a user (base tables, views, constraints) Data Definition Language (DDL) - commands that define a database, including creating, altering, and dropping tables and establishing constraints Data Manipulatio ...
Database Application Assignment
... • Each group member should create: – One diagram with at least one case (one or more “ovals” in the diagram) – Corresponding statements of pre-conditions, flows and post-conditions ...
... • Each group member should create: – One diagram with at least one case (one or more “ovals” in the diagram) – Corresponding statements of pre-conditions, flows and post-conditions ...