Ontology Based Query Answering: The Story So Far
... relations between the concepts and roles in the data source, and possibly extending the vocabulary with additional terms. Then one can query the data using the extended vocabulary, and taking into account all the relations implied by the ontology. This is essentially the idea underlying Ontology Bas ...
... relations between the concepts and roles in the data source, and possibly extending the vocabulary with additional terms. Then one can query the data using the extended vocabulary, and taking into account all the relations implied by the ontology. This is essentially the idea underlying Ontology Bas ...
flt-schedul
... There are 6 hubs each of which is completely connected to the others with 1 flight per hour 18 hours per day. Each of the 6 hubs is connected to about 6 non-hub cities with 1 flight every 2 hours 18 hours per day. About 30% of all reservations are cancelled. Planes are over-booked by approximately 1 ...
... There are 6 hubs each of which is completely connected to the others with 1 flight per hour 18 hours per day. Each of the 6 hubs is connected to about 6 non-hub cities with 1 flight every 2 hours 18 hours per day. About 30% of all reservations are cancelled. Planes are over-booked by approximately 1 ...
SQL in the Real World
... • Host language: A conventional language (e.g., C, Java) that supplies control structures, computational capabilities, interaction with physical devices • SQL: supplies ability to interact with database. • Using the facilities of both: the application program can act as an intermediary between the u ...
... • Host language: A conventional language (e.g., C, Java) that supplies control structures, computational capabilities, interaction with physical devices • SQL: supplies ability to interact with database. • Using the facilities of both: the application program can act as an intermediary between the u ...
Parsing a SAS Database for Correctness: A Conceptual Introduction
... It is known that all well-formed relational databases (schemas and sub-schemas) can be described by a context-free grammar. This fact allows for a host of possibilities, one being that relational databases can be parsed for syntactical correctness. While this concept is commonly accepted and observe ...
... It is known that all well-formed relational databases (schemas and sub-schemas) can be described by a context-free grammar. This fact allows for a host of possibilities, one being that relational databases can be parsed for syntactical correctness. While this concept is commonly accepted and observe ...
PHP MySQL Database
... To learn more about SQL, please visit our SQL tutorial. In the previous chapter we created an empty table named "MyGuests" with five columns: "id", "firstname", "lastname", "email" and "reg_date". Now, let us fill the table with data. Note: If a column is AUTO_INCREMENT (like the "id" column) or TIM ...
... To learn more about SQL, please visit our SQL tutorial. In the previous chapter we created an empty table named "MyGuests" with five columns: "id", "firstname", "lastname", "email" and "reg_date". Now, let us fill the table with data. Note: If a column is AUTO_INCREMENT (like the "id" column) or TIM ...
Joins for Hybrid Warehouses: Exploiting Massive Parallelism in Hadoop and Enterprise Data Warehouses.
... pushing down limited functionality, such as selections and projections, and considers pushing down joins only when both tables are stored in HDFS. Federation [21, 2, 34, 40, 30] is a solution to integrate data stored in autonomous databases, while exploiting the query processing power of all system ...
... pushing down limited functionality, such as selections and projections, and considers pushing down joins only when both tables are stored in HDFS. Federation [21, 2, 34, 40, 30] is a solution to integrate data stored in autonomous databases, while exploiting the query processing power of all system ...
mEdit, membership function editor for fCQL-based - Diuf
... The human-oriented fuzzy Classification Query Language (fCQL) allows nonexpert users to query relational databases in a more natural language using linguistic variables and terms instead of working with the values of the attributes. Each linguistic variable is related to an attribute and a set of te ...
... The human-oriented fuzzy Classification Query Language (fCQL) allows nonexpert users to query relational databases in a more natural language using linguistic variables and terms instead of working with the values of the attributes. Each linguistic variable is related to an attribute and a set of te ...
Chapter 2: Entity-Relationship Model
... E.g. Suppose employees of a bank may have jobs (responsibilities) at multiple branches, with different jobs at different branches. Then there is a ternary relationship set between entity sets employee, job and branch Relationships between more than two entity sets are rare. Most ...
... E.g. Suppose employees of a bank may have jobs (responsibilities) at multiple branches, with different jobs at different branches. Then there is a ternary relationship set between entity sets employee, job and branch Relationships between more than two entity sets are rare. Most ...
Database Repairing and Consistent Query Answering Database
... across all the database instances that are consistent and minimally differ from the inconsistent instance. Those are the so-called repairs of the database. In particular, the consistent answers to a query posed to the inconsistent database are those answers that can be simultaneously obtained from a ...
... across all the database instances that are consistent and minimally differ from the inconsistent instance. Those are the so-called repairs of the database. In particular, the consistent answers to a query posed to the inconsistent database are those answers that can be simultaneously obtained from a ...
CS2258 DATABASE MANAGEMENT SYSTEMS LAB MANUAL R.SAVITHRI
... A table should have only one primary key. If a primary key constraint is assigned to more than one column or combination of column is said to be composite primary key, which can contain 16 columns. Example; Create table stud(regno number(6) constraint primary key, name char(20)); Note: Can’t be defi ...
... A table should have only one primary key. If a primary key constraint is assigned to more than one column or combination of column is said to be composite primary key, which can contain 16 columns. Example; Create table stud(regno number(6) constraint primary key, name char(20)); Note: Can’t be defi ...
Heterogeneous / Federated / Multi-Database Systems
... • HDBS manages the global schema = ∑ (all local exported schema) • Global schema definition facilities provide mechanisms for handling the full spectrum of schematic differences that may exist among the heterogeneous local schemata. – Can use an Auxiliary Schema to store mappers, translators, and co ...
... • HDBS manages the global schema = ∑ (all local exported schema) • Global schema definition facilities provide mechanisms for handling the full spectrum of schematic differences that may exist among the heterogeneous local schemata. – Can use an Auxiliary Schema to store mappers, translators, and co ...
JDBC/Oracle tutorial
... "No suitable driver" is an error that usually occurs during a call to the DriverManager.getConnection method. The cause can be failing to load the appropriate JDBC drivers before calling the getConnection method, or it can be specifying an invalid JDBC URL--one that isn't recognized by your JDBC dri ...
... "No suitable driver" is an error that usually occurs during a call to the DriverManager.getConnection method. The cause can be failing to load the appropriate JDBC drivers before calling the getConnection method, or it can be specifying an invalid JDBC URL--one that isn't recognized by your JDBC dri ...
Ch2 E-R Model (This is Ch6 in the 5th edition)
... Use of entity sets vs. relationship sets Possible guideline is to designate a relationship set to describe an action that occurs between entities Binary versus n-ary relationship sets Although it is possible to replace any nonbinary (n-ary, for n > 2) relationship set by a number of distinct bin ...
... Use of entity sets vs. relationship sets Possible guideline is to designate a relationship set to describe an action that occurs between entities Binary versus n-ary relationship sets Although it is possible to replace any nonbinary (n-ary, for n > 2) relationship set by a number of distinct bin ...
Representing and utilizing DDI in relational databases A new
... in relational databases A new DDI best practices working paper Ingo Barkow, Senior researcher, Leibniz Institute for Educational Research and Educational Information (DIPF) David Schiller, Senior researcher, Institute for Employment Research ...
... in relational databases A new DDI best practices working paper Ingo Barkow, Senior researcher, Leibniz Institute for Educational Research and Educational Information (DIPF) David Schiller, Senior researcher, Institute for Employment Research ...
Java Database Connectivity (JDBC)
... connection object • What tables exist, what username is being used, is the DB readonly, what are the primary keys for a table, etc. DatabaseMetaData dmd = c.getMetaData(); • Lets developers write apps that are DB-independent ...
... connection object • What tables exist, what username is being used, is the DB readonly, what are the primary keys for a table, etc. DatabaseMetaData dmd = c.getMetaData(); • Lets developers write apps that are DB-independent ...
Effective Quotation - Informatics Homepages Server
... It is important to note that SQL does not natively support general recursion or first-class functional abstraction (although there are recent proposals to support the latter [15]). Nonrecursive lambda-abstraction is supported in query expressions in Links and F#, but it is eliminated in the process ...
... It is important to note that SQL does not natively support general recursion or first-class functional abstraction (although there are recent proposals to support the latter [15]). Nonrecursive lambda-abstraction is supported in query expressions in Links and F#, but it is eliminated in the process ...
Leveraging SQL Return Codes When Querying Relational Databases
... Good news and bad news. The good news is that, generally speaking, the number of coding problems from logic and syntax goes down as a programmer becomes more experienced with the particular language they‟re working with. We control the level and magnitude of these problems and over time learns how t ...
... Good news and bad news. The good news is that, generally speaking, the number of coding problems from logic and syntax goes down as a programmer becomes more experienced with the particular language they‟re working with. We control the level and magnitude of these problems and over time learns how t ...
Self-Tuning Database Systems: A Decade of Progress
... Our VLDB 1997 paper also presented a set of optimizations for obtaining the optimizer estimated cost of a query for a given configuration (denoted by Cost (Q,C)) without having to invoke the query optimizer. The essential idea was to show how Cost (Q,C) could be derived from the costs of certain imp ...
... Our VLDB 1997 paper also presented a set of optimizations for obtaining the optimizer estimated cost of a query for a given configuration (denoted by Cost (Q,C)) without having to invoke the query optimizer. The essential idea was to show how Cost (Q,C) could be derived from the costs of certain imp ...
lecture12
... Introduction to JDBC JDBC is a simple API for connecting from Java applications to multiple databases. Lets you smoothly translate between the world of the database, and the world of the Java application. The idea of a universal database access API is not a new one. For example, Open Database ...
... Introduction to JDBC JDBC is a simple API for connecting from Java applications to multiple databases. Lets you smoothly translate between the world of the database, and the world of the Java application. The idea of a universal database access API is not a new one. For example, Open Database ...
jdbc
... Introduction to JDBC JDBC is a simple API for connecting from Java applications to multiple databases. Lets you smoothly translate between the world of the database, and the world of the Java application. The idea of a universal database access API is not a new one. For example, Open Database ...
... Introduction to JDBC JDBC is a simple API for connecting from Java applications to multiple databases. Lets you smoothly translate between the world of the database, and the world of the Java application. The idea of a universal database access API is not a new one. For example, Open Database ...
File - You have to dream before your dreams can come
... you can do so during the declaration, using either of the following: • The DEFAULT keyword • The assignment operator • You can also specify that a variable should not have a NULL value using the NOT NULL constraint. If you use the NOT NULL constraint, you must explicitly assign an initial value for ...
... you can do so during the declaration, using either of the following: • The DEFAULT keyword • The assignment operator • You can also specify that a variable should not have a NULL value using the NOT NULL constraint. If you use the NOT NULL constraint, you must explicitly assign an initial value for ...
Ch01 slides
... 1989 The American National Standards Institute (ANSI) published the first set of standards for a database query language, called ANSI/ISO SQL-89, or SQL1. 1992 ANSI published standards (ANSI/ISO SQL-92, or SQL2) that were more stringent than SQL1 and incorporated many new features. These standards i ...
... 1989 The American National Standards Institute (ANSI) published the first set of standards for a database query language, called ANSI/ISO SQL-89, or SQL1. 1992 ANSI published standards (ANSI/ISO SQL-92, or SQL2) that were more stringent than SQL1 and incorporated many new features. These standards i ...
The Relational Model - UCF Computer Science
... Where do ICs Come From? ICs are based upon the semantics of the realworld enterprise that is being described in the database relations. We can check a database instance to see if an IC is violated, but we can NEVER infer that an IC is true by looking at an instance. ...
... Where do ICs Come From? ICs are based upon the semantics of the realworld enterprise that is being described in the database relations. We can check a database instance to see if an IC is violated, but we can NEVER infer that an IC is true by looking at an instance. ...
SELECT COUNT - Moodle
... Write SQL Statements to (1) create the BREED table, (2) insert the data in Figure3-20 into the BREED table, (3) alter the PET_3 table so that PetBreed is a foreign key referencing BreedName in BREED, and (4) to display the last name, first name, and email of any owner of a pet that has an AverageLif ...
... Write SQL Statements to (1) create the BREED table, (2) insert the data in Figure3-20 into the BREED table, (3) alter the PET_3 table so that PetBreed is a foreign key referencing BreedName in BREED, and (4) to display the last name, first name, and email of any owner of a pet that has an AverageLif ...