Database Management System
... Operators of Relational Algebra (Operations that can be carried out on a relation): 1. Selection (Unary Operator): Selecting horizontal subset of a relation or selecting rows from a relation. 2. Projection (Unary Operator): Selecting vertical subset of a relation or selecting columns from a relation ...
... Operators of Relational Algebra (Operations that can be carried out on a relation): 1. Selection (Unary Operator): Selecting horizontal subset of a relation or selecting rows from a relation. 2. Projection (Unary Operator): Selecting vertical subset of a relation or selecting columns from a relation ...
Chapter 4: SQL - Yale University
... numeric(p,d). Fixed point number, with user-specified precision of p digits, with n digits to the right of decimal point. real, double precision. Floating point and double-precision floating point numbers, with machine-dependent precision. float(n). Floating point number, with user-specified precisi ...
... numeric(p,d). Fixed point number, with user-specified precision of p digits, with n digits to the right of decimal point. real, double precision. Floating point and double-precision floating point numbers, with machine-dependent precision. float(n). Floating point number, with user-specified precisi ...
Normalization
... Boyce-Codd Normal Form (BCNF) – A relation is in BCNF if every determinant is a candidate key “I swear to construct my tables so that all nonkey columns are dependent on the key, the whole key and nothing but the key, so help me Codd.” Kroenke, Database Processing ...
... Boyce-Codd Normal Form (BCNF) – A relation is in BCNF if every determinant is a candidate key “I swear to construct my tables so that all nonkey columns are dependent on the key, the whole key and nothing but the key, so help me Codd.” Kroenke, Database Processing ...
sqlite
... SQLiteProgram - A base class for compiled SQLite programs. SQLiteQuery - A SQLite program that represents a query that reads the resulting rows into a CursorWindow. SQLiteQueryBuilder - a convenience class that helps build SQL queries to be sent to SQLiteDatabase objects. SQLiteStatement - A pre-com ...
... SQLiteProgram - A base class for compiled SQLite programs. SQLiteQuery - A SQLite program that represents a query that reads the resulting rows into a CursorWindow. SQLiteQueryBuilder - a convenience class that helps build SQL queries to be sent to SQLiteDatabase objects. SQLiteStatement - A pre-com ...
cs109sqlnotes1a
... There are three parallel sets of terminology when referring to the structure of data mentioned above. One set has already been used above. Each row in the table contains information about one entity. Each column contains a value describing a particular characteristic of the entity. The characteristi ...
... There are three parallel sets of terminology when referring to the structure of data mentioned above. One set has already been used above. Each row in the table contains information about one entity. Each column contains a value describing a particular characteristic of the entity. The characteristi ...
Remote Batch Invocation for SQL Databases
... (OR) mapping, where a relational database is described by a package of Java classes with annotations to specify tables, attributes, and relationships. Batch2SQL mapping is a simplified version of the mappings used in the Java Persistence Architecture (JPA) [18]. Figure 1 gives the classes that descr ...
... (OR) mapping, where a relational database is described by a package of Java classes with annotations to specify tables, attributes, and relationships. Batch2SQL mapping is a simplified version of the mappings used in the Java Persistence Architecture (JPA) [18]. Figure 1 gives the classes that descr ...
SQL Server 2000
... transaction manager that allows client applications to include several different sources of data in one transaction. MS DTC coordinates committing the distributed transaction across all the servers enlisted in the transaction. ...
... transaction manager that allows client applications to include several different sources of data in one transaction. MS DTC coordinates committing the distributed transaction across all the servers enlisted in the transaction. ...
AdvancedSQL - My FIT (my.fit.edu)
... the database or even SQL. A standard that is not uncommon – put all queries in stored procedures; applications are then only allowed to call stored procedures. In the simplest case, a stored procedure simply contains a single query. ...
... the database or even SQL. A standard that is not uncommon – put all queries in stored procedures; applications are then only allowed to call stored procedures. In the simplest case, a stored procedure simply contains a single query. ...
Chapter 19: Distributed Databases
... This expression is the empty set regardless of the contents of the ...
... This expression is the empty set regardless of the contents of the ...
Weak Entity Sets
... NOTE: this means a pair of entity sets can have at most one relationship in a particular relationship set. ...
... NOTE: this means a pair of entity sets can have at most one relationship in a particular relationship set. ...
Cooperative Query Processing via Knowledge Abstraction and
... Soon-Young Huh, Kae-Hyun Moon and Jin-Kyun Ahn Korea Advanced Institute of Science and Technology, Korea ...
... Soon-Young Huh, Kae-Hyun Moon and Jin-Kyun Ahn Korea Advanced Institute of Science and Technology, Korea ...
Tutorial on Relational Database Design
... Oracle, IBM DB2 and Microsoft SQL Server. There are also many free and open-source RDBMS, such as MySQL, mSQL (mini-SQL) and the embedded JavaDB (Apache Derby). A relational database organizes data in tables (or relations). A table is made up of rows and columns. A row is also called a record (or tu ...
... Oracle, IBM DB2 and Microsoft SQL Server. There are also many free and open-source RDBMS, such as MySQL, mSQL (mini-SQL) and the embedded JavaDB (Apache Derby). A relational database organizes data in tables (or relations). A table is made up of rows and columns. A row is also called a record (or tu ...
XBiT: An XML-based Bitemporal Data Model
... Temporal ER Modeling There has been much interesting work on ER-based temporal modeling of information systems at the conceptual level. For instance, ER models have been supported in commercial products for database schema designs, and more than 10 temporal enhanced ER models have been proposed in t ...
... Temporal ER Modeling There has been much interesting work on ER-based temporal modeling of information systems at the conceptual level. For instance, ER models have been supported in commercial products for database schema designs, and more than 10 temporal enhanced ER models have been proposed in t ...
Normal forms
... For readers interested in pursuing the technical background of fourth normal form a bit further, we mention that fourth normal form is defined in terms of multivalued dependencies, which correspond to our independent multi-valued facts. Multivalued dependencies, in turn, are defined essentially as r ...
... For readers interested in pursuing the technical background of fourth normal form a bit further, we mention that fourth normal form is defined in terms of multivalued dependencies, which correspond to our independent multi-valued facts. Multivalued dependencies, in turn, are defined essentially as r ...
(A) R
... If the first two characters are extracted to find the department, the domain of roll numbers is not atomic. Doing so is a bad idea: leads to encoding of information in application program rather than in the database. ...
... If the first two characters are extracted to find the department, the domain of roll numbers is not atomic. Doing so is a bad idea: leads to encoding of information in application program rather than in the database. ...
$doc.title
... due to the fact that there are several alternative expressions that are equivalent, based on syntactic redundancy and algebraic properties of the query constructs [6]. For example, Fig. 4 shows three identical queries with different syntax. Our observation is that a variety of syntactic constructs c ...
... due to the fact that there are several alternative expressions that are equivalent, based on syntactic redundancy and algebraic properties of the query constructs [6]. For example, Fig. 4 shows three identical queries with different syntax. Our observation is that a variety of syntactic constructs c ...
Part II, Multiple Choice Questions
... 1 .Properties of an object are stored as rows in a table .False 2 .It is not possible to access data stored in a database using a program written in Visual Basic or COBOL. False 3 .De Morgan's Law is used to simplify complex constraints. True 4 .DBMS stores data efficiently with little wasted space. ...
... 1 .Properties of an object are stored as rows in a table .False 2 .It is not possible to access data stored in a database using a program written in Visual Basic or COBOL. False 3 .De Morgan's Law is used to simplify complex constraints. True 4 .DBMS stores data efficiently with little wasted space. ...
Chapter 1 Relational Database Fundamentals
... minus side, however, application programs must include logic that manipulates the file’s data at a very low level of complexity. The application must know exactly where and how the file stores its data. Thus, for small systems, flat files work fine. The larger a system is, however, the more cumberso ...
... minus side, however, application programs must include logic that manipulates the file’s data at a very low level of complexity. The application must know exactly where and how the file stores its data. Thus, for small systems, flat files work fine. The larger a system is, however, the more cumberso ...
The Design and Implementation of Modern Column
... all columns of the table. In this way, there is no way to read just the particular attributes needed for a particular query without also transferring the surrounding attributes. Therefore, for this query, the row-oriented approach will be forced to read in significantly more data, as both the needed ...
... all columns of the table. In this way, there is no way to read just the particular attributes needed for a particular query without also transferring the surrounding attributes. Therefore, for this query, the row-oriented approach will be forced to read in significantly more data, as both the needed ...
The SeaView security model - Software Engineering, IEEE
... The concern for multilevel security arises when a computer system contains information with a variety of classifications and has some users who are not cleared for the highest classification of data contained in the system. A security classification, or access class, consists of a hierarchical sensi ...
... The concern for multilevel security arises when a computer system contains information with a variety of classifications and has some users who are not cleared for the highest classification of data contained in the system. A security classification, or access class, consists of a hierarchical sensi ...