Database System Concepts, 6 th Ed
... ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
... ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
Mining real world data
... SQL (Structured Query language) • SQL is a popular query language used in RDBMS. • SQL provides us with many clauses to view the kind of data we need from the tables in the RDBMS. So effectively SQL mines the RDBMS for patterns. • Patterns are specified with clauses. Few of common clauses and usage ...
... SQL (Structured Query language) • SQL is a popular query language used in RDBMS. • SQL provides us with many clauses to view the kind of data we need from the tables in the RDBMS. So effectively SQL mines the RDBMS for patterns. • Patterns are specified with clauses. Few of common clauses and usage ...
File
... Group by clause is used to apply aggregate functions to a set of tuples.The attributes given in the group by clause are used to form groups.Tuples with the same value on all attributes in the group by clause are placed in one group. ...
... Group by clause is used to apply aggregate functions to a set of tuples.The attributes given in the group by clause are used to form groups.Tuples with the same value on all attributes in the group by clause are placed in one group. ...
Database basics
... Tells you what the row contains Eg. If treeid is the primary key then the row has information about that tree ...
... Tells you what the row contains Eg. If treeid is the primary key then the row has information about that tree ...
Databasebasics2014
... Tells you what the row contains Eg. If treeid is the primary key then the row has information about that tree ...
... Tells you what the row contains Eg. If treeid is the primary key then the row has information about that tree ...
The Relational Database Model
... Secondary key not necessarily yield a unique outcome – CUSTOMER table: Primary key : Customer number Secondary key : Customer last name, Customer phone number – A secondary key’s effectiveness in narrowing down a search ...
... Secondary key not necessarily yield a unique outcome – CUSTOMER table: Primary key : Customer number Secondary key : Customer last name, Customer phone number – A secondary key’s effectiveness in narrowing down a search ...
Relational Databases
... A primary key – which must be a unique identifier for each record - must be defined. (Access does provide an Autonumber function is there is no natural unique identifier. ...
... A primary key – which must be a unique identifier for each record - must be defined. (Access does provide an Autonumber function is there is no natural unique identifier. ...
Fundamental_of_RDBMS.pdf
... Relational Database Name database approaches : Relational, Hierarchical Network What is Relational database approach Terminology : Relational, entity, attributes Tuples, entity identifier, primery key, secondary key. Relationship in conceptual databases. One to one, one-to-many, many-to-many relatio ...
... Relational Database Name database approaches : Relational, Hierarchical Network What is Relational database approach Terminology : Relational, entity, attributes Tuples, entity identifier, primery key, secondary key. Relationship in conceptual databases. One to one, one-to-many, many-to-many relatio ...
Slides - Cs.UCLA.Edu
... queries expressible using relational algebra or, equivalently, using safe relational calculus queries. ...
... queries expressible using relational algebra or, equivalently, using safe relational calculus queries. ...
relation schemas
... – If the primary key value of the tuple being deleted is referenced from other tuples in the database • Can be remedied by several actions: RESTRICT, CASCADE, SET NULL (see Chapter 8 for more details) – RESTRICT option: reject the deletion – CASCADE option: propagate the new primary key value into t ...
... – If the primary key value of the tuple being deleted is referenced from other tuples in the database • Can be remedied by several actions: RESTRICT, CASCADE, SET NULL (see Chapter 8 for more details) – RESTRICT option: reject the deletion – CASCADE option: propagate the new primary key value into t ...
4 rel model
... course. Note that all course offerings in the semester are unique, i.e. course names and numbers do not overlap. A course can have ≥ 0 prerequisites, excluding itself. A student enrolled in a course must have enrolled in all its pre-requisites. Each student receives a grade in each course. The depar ...
... course. Note that all course offerings in the semester are unique, i.e. course names and numbers do not overlap. A course can have ≥ 0 prerequisites, excluding itself. A student enrolled in a course must have enrolled in all its pre-requisites. Each student receives a grade in each course. The depar ...
The Relational Data Model and Relational Database Constraints
... DEPARTMENT relation with DNUMBER=2. We may enforce the constraint by: (i) rejecting the insertion of the new PROJECT tuple, (ii) changing the value of DNUM in the new PROJECT tuple to an existing DNUMBER value in the DEPARTMENT relation, or (iii) inserting a new DEPARTMENT tuple with DNUMBER=2. (c) ...
... DEPARTMENT relation with DNUMBER=2. We may enforce the constraint by: (i) rejecting the insertion of the new PROJECT tuple, (ii) changing the value of DNUM in the new PROJECT tuple to an existing DNUMBER value in the DEPARTMENT relation, or (iii) inserting a new DEPARTMENT tuple with DNUMBER=2. (c) ...
Outline of topics covered in the Advanced SQL series
... College of Business, New Mexico State University Databases used in this SQL series: Human Resources – This is a pre-existing database provided by Oracle when you install Oracle XE. Student-Teams – This database was created in the SQL Fundamentals series. The DIVISION lesson adds two tables to th ...
... College of Business, New Mexico State University Databases used in this SQL series: Human Resources – This is a pre-existing database provided by Oracle when you install Oracle XE. Student-Teams – This database was created in the SQL Fundamentals series. The DIVISION lesson adds two tables to th ...
Select - FSU Computer Science Department
... Look at the formal basis for operations on the relational data model An “algebra” is a collection of operations on some domain Relational Algebra is a collection of operators – operands and results are relations – operators • projection and selection remove parts of a relation • set operators, union ...
... Look at the formal basis for operations on the relational data model An “algebra” is a collection of operations on some domain Relational Algebra is a collection of operators – operands and results are relations – operators • projection and selection remove parts of a relation • set operators, union ...
Seminar1
... SQL To investigate relational databases using queries which can be expressed as algebraic operations To compare the actual output produced by an SQL interpreter from a database with the result of applying operations to its relational model ...
... SQL To investigate relational databases using queries which can be expressed as algebraic operations To compare the actual output produced by an SQL interpreter from a database with the result of applying operations to its relational model ...
Relational Databases - CSE Buffalo
... A pair of instances (r1 , r2 ) satisfies a foreign key constraint (S1 , S2 ) if for every tuple t1 ∈ r1 , t1 [S1 ] = t2 [S2 ] for some tuple t2 ∈ r2 or t1 [S1 ] ...
... A pair of instances (r1 , r2 ) satisfies a foreign key constraint (S1 , S2 ) if for every tuple t1 ∈ r1 , t1 [S1 ] = t2 [S2 ] for some tuple t2 ∈ r2 or t1 [S1 ] ...
OODB by Shantanu Narang
... represented in tables, rows, or columns. These structures include executable statements (i.e., ...
... represented in tables, rows, or columns. These structures include executable statements (i.e., ...
RDBMS and Data Management
... RDBMS and data management A relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as invented by E. F. Codd, of IBM's San Jose Research Laboratory. In 2017, many of the databases in widespread use are based on the relational databa ...
... RDBMS and data management A relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as invented by E. F. Codd, of IBM's San Jose Research Laboratory. In 2017, many of the databases in widespread use are based on the relational databa ...
Lab 13-final
... % operator is used inside the like operator. Ex. ‘%United’- Returns strings which ends with with United ‘United%’ - Returns string which starts with United ‘%United%’- Returns string which contains United irrespective of the location. ...
... % operator is used inside the like operator. Ex. ‘%United’- Returns strings which ends with with United ‘United%’ - Returns string which starts with United ‘%United%’- Returns string which contains United irrespective of the location. ...
MIS 301- Database
... A -> B, for every valid instance of A, that value of A uniquely determines the value of B ...
... A -> B, for every valid instance of A, that value of A uniquely determines the value of B ...
