chapter02
... can include calculated fields that are not in the database in queries field (calculated field) – a field that is the result of a calculation using one or more ...
... can include calculated fields that are not in the database in queries field (calculated field) – a field that is the result of a calculation using one or more ...
Chapter 4
... Used to update specific records with data, based on the given criteria. Update the Major 1 field in the database to “Management” where it currently is “MG” ...
... Used to update specific records with data, based on the given criteria. Update the Major 1 field in the database to “Management” where it currently is “MG” ...
MS_Access
... Relational database and keys • A relational database is a collection of tables that are related to one another based on common fields. • A field, or a collection of fields, is designated as the primary key of each table. • The primary key uniquely identifies a record in the table. • When the primar ...
... Relational database and keys • A relational database is a collection of tables that are related to one another based on common fields. • A field, or a collection of fields, is designated as the primary key of each table. • The primary key uniquely identifies a record in the table. • When the primar ...
Relational Database
... Order is ASC(default) or DESC Can have major and minor orders CLUSTER specification keeps records with same value for indexed field together (only one per table) Oracle automatically indexes primary key columns ...
... Order is ASC(default) or DESC Can have major and minor orders CLUSTER specification keeps records with same value for indexed field together (only one per table) Oracle automatically indexes primary key columns ...
branch-name
... relational algebra. It is used to list the attributes desired in the result of a query. Find the names of all branches in the loan relation ...
... relational algebra. It is used to list the attributes desired in the result of a query. Find the names of all branches in the loan relation ...
Lecture 18 - Introduction to Distributed Databases
... • Vertical Fragmentation (Κάθεηη Καηάημηζη) – create subset of columns of a relation and assign each subset to a distributed site (or relation might physically be fragmented). – Collection of fragments should be a lossless-join decomposition of the original relation (in other words we can recover th ...
... • Vertical Fragmentation (Κάθεηη Καηάημηζη) – create subset of columns of a relation and assign each subset to a distributed site (or relation might physically be fragmented). – Collection of fragments should be a lossless-join decomposition of the original relation (in other words we can recover th ...
Theory and Practice of Logic Programming Taming primary key
... κ : R → 2N is a function that associates, to each r ∈ R, a nonempty set of positions from [α(r)], which represents the primary key of r. Moreover, for each relation symbol r ∈ R and for each position i ∈ [α(r)], r[i ] denotes the i -th attribute of r. Throughout, let Σ = R, α, κ denote a relationa ...
... κ : R → 2N is a function that associates, to each r ∈ R, a nonempty set of positions from [α(r)], which represents the primary key of r. Moreover, for each relation symbol r ∈ R and for each position i ∈ [α(r)], r[i ] denotes the i -th attribute of r. Throughout, let Σ = R, α, κ denote a relationa ...
An Architecture for Automatic Relational Database System Conversion
... works in (dept), the title of his or her job, and the tag number for his or her car (cartag) in the parking lot. After some time, management recognizes that the database system can be used to keep the health records of each employee as well. Adding attributes for weight, lung capacity, blood pressur ...
... works in (dept), the title of his or her job, and the tag number for his or her car (cartag) in the parking lot. After some time, management recognizes that the database system can be used to keep the health records of each employee as well. Adding attributes for weight, lung capacity, blood pressur ...
Statistical Database Query Languages
... HSDB [21] is an SDBMS implemented on top of the relational system Model 204. HSDB has extensive data descriptors such as the discrimination between discrete/ continuous values (or the original source), missing values, the unit, the precision, the theoretical distribution, and summary statistics abou ...
... HSDB [21] is an SDBMS implemented on top of the relational system Model 204. HSDB has extensive data descriptors such as the discrimination between discrete/ continuous values (or the original source), missing values, the unit, the precision, the theoretical distribution, and summary statistics abou ...
multiple arrays and database tables
... • phpmyadmin is a set of PHP scripts that create a general purpose interface to work with a mySQL ...
... • phpmyadmin is a set of PHP scripts that create a general purpose interface to work with a mySQL ...
Object Relational Mapping from A to Z
... between incompatible type systems in objectoriented programming languages. This creates, in effect, a ‘virtual object database’ that can be used from within the programming language” • “Maps” set based data to objects useable by Object Oriented languages. ...
... between incompatible type systems in objectoriented programming languages. This creates, in effect, a ‘virtual object database’ that can be used from within the programming language” • “Maps” set based data to objects useable by Object Oriented languages. ...
Relational Databases and SQLite
... • Complexity makes speed possible and allows you to get very fast results as the data size grows • By normalizing the data and linking it with integer keys, the overall amount of data which the relational database must scan is far lower than if the data were simply flattened out • It might seem like ...
... • Complexity makes speed possible and allows you to get very fast results as the data size grows • By normalizing the data and linking it with integer keys, the overall amount of data which the relational database must scan is far lower than if the data were simply flattened out • It might seem like ...
Chapter 4: Advanced SQL
... constraint. They test values inserted in the database, and test queries to ensure that the comparisons make sense. New domains can be created from existing data types ...
... constraint. They test values inserted in the database, and test queries to ensure that the comparisons make sense. New domains can be created from existing data types ...
EF Code First with SQL CE and LocalDb
... EF 4.0 included with .NET 4.0 fixed many bugs, added features like lazy loading (Linq to SQL) EF 4.1 – online download, Package Manager Adds Code First EF 4.3.1 current version EF 5.0 beta Adding migration -> versioning of databases ...
... EF 4.0 included with .NET 4.0 fixed many bugs, added features like lazy loading (Linq to SQL) EF 4.1 – online download, Package Manager Adds Code First EF 4.3.1 current version EF 5.0 beta Adding migration -> versioning of databases ...
Normalisation Example2
... – 2NF is better than 1NF; 3NF is better than 2NF – For most business database design purposes, 3NF is as high as needed in normalization – Highest level of normalization is not always most desirable ...
... – 2NF is better than 1NF; 3NF is better than 2NF – For most business database design purposes, 3NF is as high as needed in normalization – Highest level of normalization is not always most desirable ...
C-Phrase: A System for Building Robust Natural Language
... key to the STATE table, and STATE has the primary key STATE.NAME, then normally the equi-join CITY.STATE = STATE.NAME ∈ J. Note that for purposes of naming, order matters. Thus the equi-join CITY.STATE = STATE.NAME is not the same as the equijoin STATE.NAME = CITY.STATE (see figure1). This accounts ...
... key to the STATE table, and STATE has the primary key STATE.NAME, then normally the equi-join CITY.STATE = STATE.NAME ∈ J. Note that for purposes of naming, order matters. Thus the equi-join CITY.STATE = STATE.NAME is not the same as the equijoin STATE.NAME = CITY.STATE (see figure1). This accounts ...
