Relational Query Languages: Relational Algebra
... • Schema of result contains exactly the fields in the projection list, with the same names that they had in the input relation. • Projection operator has to eliminate duplicates – duplicates are always eliminated in relational algebra: relations are sets! – Note: real systems typically don’t do ...
... • Schema of result contains exactly the fields in the projection list, with the same names that they had in the input relation. • Projection operator has to eliminate duplicates – duplicates are always eliminated in relational algebra: relations are sets! – Note: real systems typically don’t do ...
IBM DB2 spatial - EPPS Academic Computing
... In 2001 IBM and ESRI partnered and jointly developed the IBM DB2 Spatial Extender, which incorporated geographic or spatial information with business and other data already residing in an IBM Universal Database. Spatial data may be manipulated within the database by utilizing spatial extender functi ...
... In 2001 IBM and ESRI partnered and jointly developed the IBM DB2 Spatial Extender, which incorporated geographic or spatial information with business and other data already residing in an IBM Universal Database. Spatial data may be manipulated within the database by utilizing spatial extender functi ...
MySQL Chapter 3
... • Use NOT NULL clause in CREATE TABLE command to exclude the use of nulls in a column • Default is to allow null values • If a column is defined as NOT NULL, system will reject any attempt to store a null value there ...
... • Use NOT NULL clause in CREATE TABLE command to exclude the use of nulls in a column • Default is to allow null values • If a column is defined as NOT NULL, system will reject any attempt to store a null value there ...
download
... recovery beginning at the lowest checkpoint SCN in the datafile headers; if you use a backup control file, Oracle starts media recovery using the lowest of the following: the control file SCN and the lowest SCN in the datafile headers. To perform media recovery either apply archived redo logs or, if ...
... recovery beginning at the lowest checkpoint SCN in the datafile headers; if you use a backup control file, Oracle starts media recovery using the lowest of the following: the control file SCN and the lowest SCN in the datafile headers. To perform media recovery either apply archived redo logs or, if ...
Evaluating and Comparing Oracle Database Appliance X6
... support of database solutions for organizations of every size. Optimized for the world’s most popular database—Oracle Database—it integrates software, compute, storage, and network resources to deliver database services for a wide range of custom and packaged online transaction processing (OLTP), in ...
... support of database solutions for organizations of every size. Optimized for the world’s most popular database—Oracle Database—it integrates software, compute, storage, and network resources to deliver database services for a wide range of custom and packaged online transaction processing (OLTP), in ...
IBM EXAM 000-302
... Which of the following is not true for well-formed XML document? A. Each element begins with a start tag and ends with an end tag. B. An element can contain other elements, attributes, or text nodes. C. Attribute values must be enclosed in double quotes. Text nodes, on the other hand, should not. D. ...
... Which of the following is not true for well-formed XML document? A. Each element begins with a start tag and ends with an end tag. B. An element can contain other elements, attributes, or text nodes. C. Attribute values must be enclosed in double quotes. Text nodes, on the other hand, should not. D. ...
SQL Server Enterprise Manager
... Class Activity XYZ Corp. needs to deploy a large project with a Visual Basic front end and SQL Server 2000 back end. Polly, the DBA, wants to grant different types of permissions to different sets of users. For example, for the group that needs student details, she wants to give access only to the ...
... Class Activity XYZ Corp. needs to deploy a large project with a Visual Basic front end and SQL Server 2000 back end. Polly, the DBA, wants to grant different types of permissions to different sets of users. For example, for the group that needs student details, she wants to give access only to the ...
KorthDB6_ch7
... 1. each A entity is associated with a unique entity from B and C or 2. each pair of entities from (A, B) is associated with a unique C entity, and each pair (A, C) is associated with a unique B ...
... 1. each A entity is associated with a unique entity from B and C or 2. each pair of entities from (A, B) is associated with a unique C entity, and each pair (A, C) is associated with a unique B ...
Link to technical report
... specifications in the oceanographic community for both the data and metadata components. For the data, we have shown the utility of the Arc Marine data model. For metadata, we have utilized components of the International Organization for Standardization (ISO) 19115 standard for geospatial metadata. ...
... specifications in the oceanographic community for both the data and metadata components. For the data, we have shown the utility of the Arc Marine data model. For metadata, we have utilized components of the International Organization for Standardization (ISO) 19115 standard for geospatial metadata. ...
Chapter 14: Query Optimization
... Consider n alternatives with one relation as right-hand side input and the other relations as left-hand side input. Modify optimization algorithm: Replace “for each non-empty subset S1 of S such that S1 S” By: for each relation r in S ...
... Consider n alternatives with one relation as right-hand side input and the other relations as left-hand side input. Modify optimization algorithm: Replace “for each non-empty subset S1 of S such that S1 S” By: for each relation r in S ...
Entity - WordPress.com
... – A characteristics common to all or most instances of an entity – property or characteristic of an entity type – a descriptive property or characteristic of an entity. Synonyms include element, property, and field. • Just as a physical student can have attributes, such as hair color, height, etc., ...
... – A characteristics common to all or most instances of an entity – property or characteristic of an entity type – a descriptive property or characteristic of an entity. Synonyms include element, property, and field. • Just as a physical student can have attributes, such as hair color, height, etc., ...
MapReduce: A major step backwards
... new application against a data set, he or she must discover the record structure. In modern DBMSs, the schema is stored in a collection of system catalogs and can be queried (in SQL) by any user to uncover such structure. In contrast, when the schema does not exist or is buried in an application pro ...
... new application against a data set, he or she must discover the record structure. In modern DBMSs, the schema is stored in a collection of system catalogs and can be queried (in SQL) by any user to uncover such structure. In contrast, when the schema does not exist or is buried in an application pro ...
A Modular Query Optimizer Architecture for Big Data - CMU 15-721
... Figure 2 shows the interaction between Orca and an external database system. The input to Orca is a DXL query. The output of Orca is a DXL plan. During optimization, the database system can be queried for metadata (e.g., table definitions). Orca abstracts metadata access details by allowing database ...
... Figure 2 shows the interaction between Orca and an external database system. The input to Orca is a DXL query. The output of Orca is a DXL plan. During optimization, the database system can be queried for metadata (e.g., table definitions). Orca abstracts metadata access details by allowing database ...
True/False Questions
... 1. A file is a collection of similar records. Answer: True Page: 518 LOD: Easy 2. A database is a collection of interrelated files. Answer: True Page: 518 LOD: Easy 3. An historical advantage of using conventional files has been processing speed. They can be optimized for the access of the applicati ...
... 1. A file is a collection of similar records. Answer: True Page: 518 LOD: Easy 2. A database is a collection of interrelated files. Answer: True Page: 518 LOD: Easy 3. An historical advantage of using conventional files has been processing speed. They can be optimized for the access of the applicati ...
Migration Guide - Information Products
... not announced or available in your country. Such references do not imply that Teradata Corporation intends to announce such features, functions, products, or services in your country. Please consult your local Teradata Corporation representative for those features, functions, products, or services a ...
... not announced or available in your country. Such references do not imply that Teradata Corporation intends to announce such features, functions, products, or services in your country. Please consult your local Teradata Corporation representative for those features, functions, products, or services a ...
Interacting with the Oracle Server
... • Retrieve the current row values into variables • Include the same number of variables • Match each variable to correspond to the columns positionally • Test to see whether the cursor contains rows ...
... • Retrieve the current row values into variables • Include the same number of variables • Match each variable to correspond to the columns positionally • Test to see whether the cursor contains rows ...
Data persistence in programming languages : a survey
... Databases are similar to files: they must be explicitly opened and closed. Unlike the regular typed files of Pascal, which can be declared to contain instances of any Pascal type, d a t a b a s e s are restricted to act as the (exclusive) repositories for r e l a t i o n instances, the other new P ...
... Databases are similar to files: they must be explicitly opened and closed. Unlike the regular typed files of Pascal, which can be declared to contain instances of any Pascal type, d a t a b a s e s are restricted to act as the (exclusive) repositories for r e l a t i o n instances, the other new P ...
Reengineering of Database Applications to EJB based Architecture
... business solution. With the growing popularity of the EJB framework, more and more legacy systems and old web-based systems are being transitioned into EJB architecture. Typically, in the legacy systems there are large amount of SQL queries. On the other hand, in the EJB based applications, those SQ ...
... business solution. With the growing popularity of the EJB framework, more and more legacy systems and old web-based systems are being transitioned into EJB architecture. Typically, in the legacy systems there are large amount of SQL queries. On the other hand, in the EJB based applications, those SQ ...
ECP2.1 Upgrade Client
... behavior of ECP across all the supported databases. Oracle and PostgreSQL use case sensitive search by default while MySQL and MSSQL are case insensitive. This can lead to some minor issues during message transportation when the message passes through databases with different case sensitivity. Takin ...
... behavior of ECP across all the supported databases. Oracle and PostgreSQL use case sensitive search by default while MySQL and MSSQL are case insensitive. This can lead to some minor issues during message transportation when the message passes through databases with different case sensitivity. Takin ...
ppt
... Consider n alternatives with one relation as right-hand side input and the other relations as left-hand side input. Modify optimization algorithm: Replace “for each non-empty subset S1 of S such that S1 S” By: for each relation r in S ...
... Consider n alternatives with one relation as right-hand side input and the other relations as left-hand side input. Modify optimization algorithm: Replace “for each non-empty subset S1 of S such that S1 S” By: for each relation r in S ...
Data Import for SQL Server User's Manual
... © 1999-2014 EMS Database Management Solutions, Ltd. All rights reserved. This manual documents EMS Data Import for SQL Server No parts of this work may be reproduced in any form or by any means - graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage an ...
... © 1999-2014 EMS Database Management Solutions, Ltd. All rights reserved. This manual documents EMS Data Import for SQL Server No parts of this work may be reproduced in any form or by any means - graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage an ...