Fundamental_of_RDBMS.pdf
... Problems with traditional file processing system. Objectives of database management system. Data Independence Data integrity Relational Database Name database approaches : Relational, Hierarchical Network What is Relational database approach Terminology : Relational, entity, attributes Tuples, entit ...
... Problems with traditional file processing system. Objectives of database management system. Data Independence Data integrity Relational Database Name database approaches : Relational, Hierarchical Network What is Relational database approach Terminology : Relational, entity, attributes Tuples, entit ...
create table
... Keys are special fields that serve a specific purpose within a table. A Primary key is a field (or combination of fields) that uniquely identifies a record within a table. A Foreign key is the field that is used to establish a relationship between a pair of tables.A foreign key has to be a pri ...
... Keys are special fields that serve a specific purpose within a table. A Primary key is a field (or combination of fields) that uniquely identifies a record within a table. A Foreign key is the field that is used to establish a relationship between a pair of tables.A foreign key has to be a pri ...
Databases
... Tables store data, so they are the essential building blocks of all databases. Tables--are used to group and organize the information within a database. All databases contain at least one table. ◦ Each database usually consists of one or more tables. Sli de ...
... Tables store data, so they are the essential building blocks of all databases. Tables--are used to group and organize the information within a database. All databases contain at least one table. ◦ Each database usually consists of one or more tables. Sli de ...
A Closer Look
... or, if it does not complete, it has no effect at all (aborts). – This is not true of ordinary programs. A hardware or software failure could leave files partially updated. ...
... or, if it does not complete, it has no effect at all (aborts). – This is not true of ordinary programs. A hardware or software failure could leave files partially updated. ...
Database Performance Document
... software, the operating system, and the physics of the hardware. Most tuning books offer practical rules of thumb but don’t mention their limitations. For example, a book may tell you never to use aggregate functions (such as AVG) when transaction response time is critical. The underlying reason is ...
... software, the operating system, and the physics of the hardware. Most tuning books offer practical rules of thumb but don’t mention their limitations. For example, a book may tell you never to use aggregate functions (such as AVG) when transaction response time is critical. The underlying reason is ...
Yukon – What is New
... rebuilding relational and XML indexes. The CREATE INDEX statement has been enhanced to support XML index syntax, partitioning, and included (nonkey) columns. Several index options have been added including ONLINE, which allows concurrent user access to the underlying data during some index operation ...
... rebuilding relational and XML indexes. The CREATE INDEX statement has been enhanced to support XML index syntax, partitioning, and included (nonkey) columns. Several index options have been added including ONLINE, which allows concurrent user access to the underlying data during some index operation ...
DB1 English - Introduction
... Some users are not authorized to access all information in the database Some users are allowed only to retrieve data whereas others are allowed to both retrieve and update Students: read their own marks after the exams Teachers: read and update all marks for their own students ...
... Some users are not authorized to access all information in the database Some users are allowed only to retrieve data whereas others are allowed to both retrieve and update Students: read their own marks after the exams Teachers: read and update all marks for their own students ...
CSCI 242 Advanced Database
... » We need a way to insert data into the database, retrieve data from the database, and changes values that are stored in the database » We define a data language that can be used from any programming language to do that » The data language (SQL) has a lot of power and can save a lot of programming ...
... » We need a way to insert data into the database, retrieve data from the database, and changes values that are stored in the database » We define a data language that can be used from any programming language to do that » The data language (SQL) has a lot of power and can save a lot of programming ...
A column alias is a new heading/title for a column
... 7. What is the difference between a projection, selection, and join statement? Use the projection capability in SQL to choose the columns in a table. Use the selection capability in SQL to choose the rows in a table. Use the join capability in SQL to choose the columns from more than one table. 8. H ...
... 7. What is the difference between a projection, selection, and join statement? Use the projection capability in SQL to choose the columns in a table. Use the selection capability in SQL to choose the rows in a table. Use the join capability in SQL to choose the columns from more than one table. 8. H ...
Powerpoints - SQL Saturday
... Data types: ntext, text, and image, vardecimal, varchar(max) and nvarchar(max), rowversion (and timestamp), sql_variant, CLR types (hierarchyid and spatial types), xml, uniqueidentifier ...
... Data types: ntext, text, and image, vardecimal, varchar(max) and nvarchar(max), rowversion (and timestamp), sql_variant, CLR types (hierarchyid and spatial types), xml, uniqueidentifier ...
week10
... • A view is more for viewing rather than updating since an update could disqualify a record from the view. • Updates made to a view are made to the table(s) and any changes made to the table(s) are reflected in the view. ...
... • A view is more for viewing rather than updating since an update could disqualify a record from the view. • Updates made to a view are made to the table(s) and any changes made to the table(s) are reflected in the view. ...
Data Definition Language
... management systems is the safeguarding of data in the event of a system failure. All commercial databases achieve the high standard of recovery the database to the last committed transaction. Logging is the mechanism by which Oracle creates redo logs, two or more preallocated files that store all ch ...
... management systems is the safeguarding of data in the event of a system failure. All commercial databases achieve the high standard of recovery the database to the last committed transaction. Logging is the mechanism by which Oracle creates redo logs, two or more preallocated files that store all ch ...
chapter 1 introduction to databases
... – A collection of self-describing and integrated data files ...
... – A collection of self-describing and integrated data files ...
Database Theory What is a database? A database is a document
... to ensure that there is no question of which record is addressed. This is why the College has Student_ID. No two Student_IDs are the same, even when the students have left the College. One way to achieve this easily in a database is by using auto increment. Auto-increment every time a new record is ...
... to ensure that there is no question of which record is addressed. This is why the College has Student_ID. No two Student_IDs are the same, even when the students have left the College. One way to achieve this easily in a database is by using auto increment. Auto-increment every time a new record is ...
Class Notes
... – The purpose of the labs is to practice and expand on what you learned in the lecture and studied in the text book. – provide you with actual practical problems as they occur in the industry. – It is the hands-on, practical side of the course. Attendance and completion of the labs will be a key fac ...
... – The purpose of the labs is to practice and expand on what you learned in the lecture and studied in the text book. – provide you with actual practical problems as they occur in the industry. – It is the hands-on, practical side of the course. Attendance and completion of the labs will be a key fac ...
File - Ghulam Hassan
... Distributed – databases that are physically distributed in whole or in part to network servers at a variety of sites example is GOOGLE there are two types of Distributed databases: • Partitioned: Separate locations store different parts of database • Replicated: Central database duplicated in entire ...
... Distributed – databases that are physically distributed in whole or in part to network servers at a variety of sites example is GOOGLE there are two types of Distributed databases: • Partitioned: Separate locations store different parts of database • Replicated: Central database duplicated in entire ...
History of databases and the relational model
... Today, you are meeting for the first time and need to organize the responsibilities. (These may change, but this will give you a first pass at primary responsibilities for the project tasks.) ...
... Today, you are meeting for the first time and need to organize the responsibilities. (These may change, but this will give you a first pass at primary responsibilities for the project tasks.) ...