D - 國立東華大學
... customer-name (loan.loan-number = borrower.loan-number ( (branch-name = “Perryridge” (loan)) x borrower)) ...
... customer-name (loan.loan-number = borrower.loan-number ( (branch-name = “Perryridge” (loan)) x borrower)) ...
Database Systems
... Two records (rows) are different if and only if their primary keys are different Composite primary key – composed by several columns ...
... Two records (rows) are different if and only if their primary keys are different Composite primary key – composed by several columns ...
Database Exam Answers
... (b) When a person joins the website, they need to enter some personal data which is validated using rules. For example, the date of birth must be in the past. State one rule that could be used when validating each of the following. Email address ...
... (b) When a person joins the website, they need to enter some personal data which is validated using rules. For example, the date of birth must be in the past. State one rule that could be used when validating each of the following. Email address ...
Access 2013 Unit A EOU Solutions
... c-d. Students may select any five (or more) technical terms to define, but each should in some way be related to databases or Access. Answers will vary, but five such terms are provided as an example. Be sure that the students provide URLs for each definition. SQL: Structured Query Language (SQL) is ...
... c-d. Students may select any five (or more) technical terms to define, but each should in some way be related to databases or Access. Answers will vary, but five such terms are provided as an example. Be sure that the students provide URLs for each definition. SQL: Structured Query Language (SQL) is ...
Databases and Users
... Meta Data Data about data For storage of the data related to any entity or object existing at real world level. We define the way the data will be stored in the database. This is called Meta data. Meta data is also known as schema for the real world data. It tells that what type of data will be sto ...
... Meta Data Data about data For storage of the data related to any entity or object existing at real world level. We define the way the data will be stored in the database. This is called Meta data. Meta data is also known as schema for the real world data. It tells that what type of data will be sto ...
Reliability and Security in Database Servers
... Contains enough info for restoration to same state prior to failure. Updates that happened after the backup are not part of the state Checkpoint: Operation that forces the ...
... Contains enough info for restoration to same state prior to failure. Updates that happened after the backup are not part of the state Checkpoint: Operation that forces the ...
ppt
... Multiple users access/update the data concurrently • What can go wrong ? • How do we protect against that in OS ? • This is insufficient in databases; why ? ...
... Multiple users access/update the data concurrently • What can go wrong ? • How do we protect against that in OS ? • This is insufficient in databases; why ? ...
Value Database Property
... a SQL Server instance and then reattached to the same or a different SQL Server instance. ...
... a SQL Server instance and then reattached to the same or a different SQL Server instance. ...
lecture notes on implementing a logical-to
... • An environment in BDB encapsulates: • a set of one or more related BDB databases • the state associated with the BDB subsystems (caching, logging, transactions, locking) for those databases • RDBMS: related tables are grouped together into a database. BDB: related databases are grouped together in ...
... • An environment in BDB encapsulates: • a set of one or more related BDB databases • the state associated with the BDB subsystems (caching, logging, transactions, locking) for those databases • RDBMS: related tables are grouped together into a database. BDB: related databases are grouped together in ...
Ch10
... the Copy Database Wizard • There are several reasons to copy a database – Moving databases to an upgraded server – Create a standby server for emergencies – Copy a database from development to production ...
... the Copy Database Wizard • There are several reasons to copy a database – Moving databases to an upgraded server – Create a standby server for emergencies – Copy a database from development to production ...
Note 3
... – objects that represent files that exist on a remote system. • For instance, if your customer file exists on a remote system, you can create a DDM file on the local system that specifically points to that customer file on the remote system. ...
... – objects that represent files that exist on a remote system. • For instance, if your customer file exists on a remote system, you can create a DDM file on the local system that specifically points to that customer file on the remote system. ...
VBA Data Access Models
... • Set db = OpenDatabase(“path to database”) • Set rs = db.OpenRecordSet(“tableName”) ...
... • Set db = OpenDatabase(“path to database”) • Set rs = db.OpenRecordSet(“tableName”) ...
1 Structured Query Language 2 DDL
... The above creates a table named person, with person id, last name, first name, and date of birth. There is also the ‘primary key’ definition. A primary key is a column value that uniquely identifies a database record. So for example, we can have two ‘person’ records with the same last name and first ...
... The above creates a table named person, with person id, last name, first name, and date of birth. There is also the ‘primary key’ definition. A primary key is a column value that uniquely identifies a database record. So for example, we can have two ‘person’ records with the same last name and first ...
Education
... object-oriented data models. Moreover, XML data usually has XLinks or XPointers to data in other documents (e.g., global-links). In addition to XLink or XPointer links, the XML standard allows to add internal-links between different elements in the same XML document using the ID/IDREF attributes. Th ...
... object-oriented data models. Moreover, XML data usually has XLinks or XPointers to data in other documents (e.g., global-links). In addition to XLink or XPointer links, the XML standard allows to add internal-links between different elements in the same XML document using the ID/IDREF attributes. Th ...
Database Languages
... data and their relationship to other types of data. It is mainly used to create files, databases, data dictionary and tables within databases. It is also used to specify the structure of each table, set of associated values with each attribute, integrity constraints, security and authorization i ...
... data and their relationship to other types of data. It is mainly used to create files, databases, data dictionary and tables within databases. It is also used to specify the structure of each table, set of associated values with each attribute, integrity constraints, security and authorization i ...
AdventureWorks Queries, Apps, and Proposal
... 1) AWEmployeeDirectory.aspx -- In Chapter 8, read pages 375-377. These pages describe the EmployeeDirectory.aspx file, which allows a user to view a list of employees, see details about a particular employee, and add/modify/delete employee data. Change this file (call it AWEmployeeDirectory.aspx), a ...
... 1) AWEmployeeDirectory.aspx -- In Chapter 8, read pages 375-377. These pages describe the EmployeeDirectory.aspx file, which allows a user to view a list of employees, see details about a particular employee, and add/modify/delete employee data. Change this file (call it AWEmployeeDirectory.aspx), a ...
Relational Model
... • Unique Constraint – ensures duplicate values are not inserted into a column. • Lookup table – a separate table containing all of the acceptable values for a given column. ...
... • Unique Constraint – ensures duplicate values are not inserted into a column. • Lookup table – a separate table containing all of the acceptable values for a given column. ...
Databases - Burgate ICT
... A database keeping information for a doctors surgery may contain the following files : ...
... A database keeping information for a doctors surgery may contain the following files : ...
MonetDB/SQL meets skyserver: the challenges of a scientific database
... In this presentation we describe our experiences in porting the SkyServer application to MonetDB, the functional improvements and adaptations needed to get the original application up and running. Experiments with a representative query workload show performance figures competitive to the reference ...
... In this presentation we describe our experiences in porting the SkyServer application to MonetDB, the functional improvements and adaptations needed to get the original application up and running. Experiments with a representative query workload show performance figures competitive to the reference ...
Chapter 6: The Other Support Database
... or grant access to other University personnel to manage your record for you. Once they are given access, others can enter data and update the record. In addition, you may be able to access and work on another individual's Other Support record if you have been included in that person's Other Support ...
... or grant access to other University personnel to manage your record for you. Once they are given access, others can enter data and update the record. In addition, you may be able to access and work on another individual's Other Support record if you have been included in that person's Other Support ...
DIS Topic 02: Project Initiation
... Regulates update/delete operations that have implications to other relations ...
... Regulates update/delete operations that have implications to other relations ...
Overview -
... If this is used, index structure is a file organization for data records (instead of a Heap file or sorted file). At most one index on a given collection of data records can use Alternative 1. (Otherwise, data records are duplicated, leading to redundant storage and potential inconsistency.) If data ...
... If this is used, index structure is a file organization for data records (instead of a Heap file or sorted file). At most one index on a given collection of data records can use Alternative 1. (Otherwise, data records are duplicated, leading to redundant storage and potential inconsistency.) If data ...