CS186: Introduction to Database Systems
... Example #2: Social-network graph Each record: UserID1, UserID2 Separate records: UserID, name, age, gender, … Task: Find all friends of friends of friends of … friends of given user Large number of joins? Not efficient at all! Specially designed graph database may be better ...
... Example #2: Social-network graph Each record: UserID1, UserID2 Separate records: UserID, name, age, gender, … Task: Find all friends of friends of friends of … friends of given user Large number of joins? Not efficient at all! Specially designed graph database may be better ...
CSIT- 530 www.cs.ust.hk/~dimitris/CSIT530/530.html
... Logical level: describes data stored in database, and the relationships among the data. ...
... Logical level: describes data stored in database, and the relationships among the data. ...
INDIAN SCHOOL AL WADI AL KABIR DEPARTMENT OF
... 14. CREATE DATABASE, ALTER DATABASE, CREATE TABLE, ALTER TABLE, DROP TABLE, DROP DATABASE. 15. INSERT, DELETE, SELECT, UPDATE. 16. CREATE DATABASE Database Name; Example : CREATE DATABASE STUDENT; 17. INT(Length), FLOAT(Length), DOUBLE(Length). 18. CHAR(Length), VARCHAR(Length). 19. A Table structur ...
... 14. CREATE DATABASE, ALTER DATABASE, CREATE TABLE, ALTER TABLE, DROP TABLE, DROP DATABASE. 15. INSERT, DELETE, SELECT, UPDATE. 16. CREATE DATABASE Database Name; Example : CREATE DATABASE STUDENT; 17. INT(Length), FLOAT(Length), DOUBLE(Length). 18. CHAR(Length), VARCHAR(Length). 19. A Table structur ...
Slide 1
... An object database stores data as objects, which can be grouped into classes and defined by attributes and methods ...
... An object database stores data as objects, which can be grouped into classes and defined by attributes and methods ...
Chapter 10
... Huge database system that stores and manages data required to analyze historical and current transactions Quick and efficient way to access large amounts of data Uses multidimensional databases ...
... Huge database system that stores and manages data required to analyze historical and current transactions Quick and efficient way to access large amounts of data Uses multidimensional databases ...
SQL server Tools
... Provided 24 x 7 Production support for the database and application issues. Used calculations, sorts, filters and sections to enhance data presentation in reports. Created many Cascaded parameters in the reports using SQL SSRS. Developed many Tabular Reports, Matrix Reports, Drill down Reports and C ...
... Provided 24 x 7 Production support for the database and application issues. Used calculations, sorts, filters and sections to enhance data presentation in reports. Created many Cascaded parameters in the reports using SQL SSRS. Developed many Tabular Reports, Matrix Reports, Drill down Reports and C ...
Mining Association Rules Inside a Relational Database
... Data considered is stored in a relational table with 96 columns (attributes) and 300 cases. A step in the preparation process of this table for applying Apriori algorithm is to change the structure of the initial table in order to obtain the following structure: id, item. After this transformation w ...
... Data considered is stored in a relational table with 96 columns (attributes) and 300 cases. A step in the preparation process of this table for applying Apriori algorithm is to change the structure of the initial table in order to obtain the following structure: id, item. After this transformation w ...
Automated Resolution of Semantic Heterogeneity in
... at different locations, each site has its local internal schema. • Local conceptual schema: to handle a situation that data in distributed database is usually fragmented and replicated, local conceptual schema describes the logical organization of data at each site. • Global conceptual schema is a u ...
... at different locations, each site has its local internal schema. • Local conceptual schema: to handle a situation that data in distributed database is usually fragmented and replicated, local conceptual schema describes the logical organization of data at each site. • Global conceptual schema is a u ...
Pass4sure 190
... than in each database that uses the template, which results in less disk space used by the database. For instance, using the single copy template with a mail template stores all the design information in one place, making users¡¦ mail databases smaller because the databases no longer have to store t ...
... than in each database that uses the template, which results in less disk space used by the database. For instance, using the single copy template with a mail template stores all the design information in one place, making users¡¦ mail databases smaller because the databases no longer have to store t ...
Data Preprocessing
... Data does not match what is already in the table It is not obvious which of the rows in the database is correct ...
... Data does not match what is already in the table It is not obvious which of the rows in the database is correct ...
Lecture 6
... should see a relation described, in SQL, by (select customer_name, borrower.loan_number, branch_name from borrower, loan where borrower.loan_number = loan.loan_number ) ■ A view provides a mechanism to hide certain data from the view of ...
... should see a relation described, in SQL, by (select customer_name, borrower.loan_number, branch_name from borrower, loan where borrower.loan_number = loan.loan_number ) ■ A view provides a mechanism to hide certain data from the view of ...
database transformation
... 1 – SAP/HANA Being SAP the leading ERP system, a migration of SAP based applications to SAPs new state of the art SAP/HANA database should always be considered. The main arguments for SAP/HANA are its embedded SAP application support, its in-memory features and its unique support of FIORI apps which ...
... 1 – SAP/HANA Being SAP the leading ERP system, a migration of SAP based applications to SAPs new state of the art SAP/HANA database should always be considered. The main arguments for SAP/HANA are its embedded SAP application support, its in-memory features and its unique support of FIORI apps which ...
Chapter 5 Integrity Constraints
... ⅰThe problem of ensuring that the database does not include any invalid foreign key values is therefore known as the referential integrity problem. ⅱ The constraint that values of a given foreign key must match values of the corresponding candidate key is known as the a referential constraint. ⅲ We ...
... ⅰThe problem of ensuring that the database does not include any invalid foreign key values is therefore known as the referential integrity problem. ⅱ The constraint that values of a given foreign key must match values of the corresponding candidate key is known as the a referential constraint. ⅲ We ...
FILE ORGANIZATION
... Tables are linked to each other… … using a key field For example the employee ID This field is part of other table(s) Data from one table combined with data from other table(s) when producing reports. Can select different fields from each table for output SQL is used for queries and producing report ...
... Tables are linked to each other… … using a key field For example the employee ID This field is part of other table(s) Data from one table combined with data from other table(s) when producing reports. Can select different fields from each table for output SQL is used for queries and producing report ...
Collaborative SQL Query Recommendation for Interactive Database Exploration: a Survey
... Applying collaborative filtering technique to the database context may face several challenges. First, SQL is a declarative language, there can be two SQL statement which has different syntax but retrieve the same content, so we can not consider the textual property of queries to find similarity bet ...
... Applying collaborative filtering technique to the database context may face several challenges. First, SQL is a declarative language, there can be two SQL statement which has different syntax but retrieve the same content, so we can not consider the textual property of queries to find similarity bet ...
DBMaker Overview We can help you change your software for the
... The following is a list of manuals covering virtually every aspect of DBMaker. All manuals may be downloaded in PDF formby clicking a book title below or by visiting the download page. A short description is provided of the manual. For quick access to a specific topic, use the search button in the h ...
... The following is a list of manuals covering virtually every aspect of DBMaker. All manuals may be downloaded in PDF formby clicking a book title below or by visiting the download page. A short description is provided of the manual. For quick access to a specific topic, use the search button in the h ...
Data Management MM
... Tables are linked to each other… … using a key field For example the employee ID This field is part of other table(s) Data from one table combined with data from other table(s) when producing reports. Can select different fields from each table for output SQL is used for queries and producing report ...
... Tables are linked to each other… … using a key field For example the employee ID This field is part of other table(s) Data from one table combined with data from other table(s) when producing reports. Can select different fields from each table for output SQL is used for queries and producing report ...
Chapter 8
... Rule 9: Avoid indexes on combinations of columns. Most optimization components can use multiple indexes on the same table. ...
... Rule 9: Avoid indexes on combinations of columns. Most optimization components can use multiple indexes on the same table. ...
Chapter 10, Slide 1 Starting Out with Visual Basic 3 rd Edition
... SQL Query Example You might want to select all employees hired before 1998 and earning less than $45,000 Select ID, Name, Full_Time, Hire_Date, Salary From employees Where Hire_Date < 1/1/1998 and Salary < 45000 ...
... SQL Query Example You might want to select all employees hired before 1998 and earning less than $45,000 Select ID, Name, Full_Time, Hire_Date, Salary From employees Where Hire_Date < 1/1/1998 and Salary < 45000 ...
THE DBA`s First Date
... Know Your Baselines – Why, When, and What Why do I need a base line? • Getting your baseline allows you to know what the normal activity level is for a server at a given period of time. • This is different from load testing. ...
... Know Your Baselines – Why, When, and What Why do I need a base line? • Getting your baseline allows you to know what the normal activity level is for a server at a given period of time. • This is different from load testing. ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.