OracleSQL1Plus
... • Execute SQL from SQL*Plus. • Save SQL statements to files and append SQL statements to files. • Execute saved files. ...
... • Execute SQL from SQL*Plus. • Save SQL statements to files and append SQL statements to files. • Execute saved files. ...
PowerPoint 97
... • NULL (a value does not need to be specified) • NOT NULL (a value must be specified) • IDENTITY: sequential, unique numbering. identity(seed,increment) CREATE TABLE table_name( Column_name int identity(1,1) ) ...
... • NULL (a value does not need to be specified) • NOT NULL (a value must be specified) • IDENTITY: sequential, unique numbering. identity(seed,increment) CREATE TABLE table_name( Column_name int identity(1,1) ) ...
Chapter 7: Relational Database Design
... A relation schema R is in third normal form (3NF) if for all: ...
... A relation schema R is in third normal form (3NF) if for all: ...
SQL Server Management Studio (SSMS)
... be straight forward but the primary key shall have these properties: The values of the primary key shall be unique (ie. No duplicate value). For example, customerName may not be appropriate to be used as the primary key for the Customers table, as there could be (2) customers with the same name. ...
... be straight forward but the primary key shall have these properties: The values of the primary key shall be unique (ie. No duplicate value). For example, customerName may not be appropriate to be used as the primary key for the Customers table, as there could be (2) customers with the same name. ...
XML Publishing - Computer Science, NMSU
... composes it with the RXL view query resulting a new RXL query. It combines fragments of the view query and user query. Works the similar way that the Query Parser and Query Rewrite components in XPERRANTO do. ...
... composes it with the RXL view query resulting a new RXL query. It combines fragments of the view query and user query. Works the similar way that the Query Parser and Query Rewrite components in XPERRANTO do. ...
CmpE226-DB-L07n
... replace them and their contents by the actual name of the item named generically between the "<>" • Example: "SELECT" means that if, say,
your RDB contains a table named "students" and you
want to perform a select operation on this table, you
should write
SELECT students
...
... replace them and their contents by the actual name of the item named generically between the "<>" • Example: "SELECT
OLAP Query Evaluation in a Database Cluster: a Performance Study
... evaluate the query in parallel? To be more flexible when it comes to experiments, we have not used physical partitioning, but the following physical design scheme: All tables are fully replicated, and there are clustered primary key indexes on the fact tables, on the same attribute. With TPC-R, this ...
... evaluate the query in parallel? To be more flexible when it comes to experiments, we have not used physical partitioning, but the following physical design scheme: All tables are fully replicated, and there are clustered primary key indexes on the fact tables, on the same attribute. With TPC-R, this ...
Answering Imprecise Database Queries
... etc. to generate ranked set of tuples by using the distance measures. Thus enabling support for imprecise queries over existing databases involves modifying the database and is clearly a costly endeavor. Our Contributions: In this paper we propose a domainindependent solution for answering imprecise ...
... etc. to generate ranked set of tuples by using the distance measures. Thus enabling support for imprecise queries over existing databases involves modifying the database and is clearly a costly endeavor. Our Contributions: In this paper we propose a domainindependent solution for answering imprecise ...
Chapter 3
... language for manipulating relational databases Three classes of statements: definition, query, and manipulation You create objects with the CREATE statement You perform queries with the SELECT statement the condition is part of the WHERE clause Concepts of Database Management, 5th Edition ...
... language for manipulating relational databases Three classes of statements: definition, query, and manipulation You create objects with the CREATE statement You perform queries with the SELECT statement the condition is part of the WHERE clause Concepts of Database Management, 5th Edition ...
Fast algorithms for universal quantification in large databases
... values in the dividend, n,t .~,, ~.,~ (Transcript) in this example, is candidates. The set of all dividend tuples with the called the set of quotient candidate group. same quotient attribute value is called a quotient It is important to notice that both relations are projected on their key attribute ...
... values in the dividend, n,t .~,, ~.,~ (Transcript) in this example, is candidates. The set of all dividend tuples with the called the set of quotient candidate group. same quotient attribute value is called a quotient It is important to notice that both relations are projected on their key attribute ...
5. SQL Ch5
... • Find all customers who have both an account and a loan at the bank. select distinct customer-name from borrower where customer-name in (select customer-name from depositor) • Find all customers who have a loan at the bank but do not ...
... • Find all customers who have both an account and a loan at the bank. select distinct customer-name from borrower where customer-name in (select customer-name from depositor) • Find all customers who have a loan at the bank but do not ...
Distributed Databases - UCLA Computer Science
... Reduced data transfer: relation r is available locally at each site containing a replica of r. Disadvantages of Replication Increased cost of updates: each replica of relation r must be updated. ...
... Reduced data transfer: relation r is available locally at each site containing a replica of r. Disadvantages of Replication Increased cost of updates: each replica of relation r must be updated. ...
Distributed Databases - UCLA Computer Science
... Reduced data transfer: relation r is available locally at each site containing a replica of r. Disadvantages of Replication Increased cost of updates: each replica of relation r must be updated. ...
... Reduced data transfer: relation r is available locally at each site containing a replica of r. Disadvantages of Replication Increased cost of updates: each replica of relation r must be updated. ...
CH09
... 1. There exists a relvar R1 (R1 and R2 not necessarily distinct) with a candidate key CK. 2. It is possible to rename some subset of the attributes of FK, such that FK becomes FK’ (say) and FK’ and CK are of the same (tuple) type. 3. For all time, each value of FK in the current value of R2 yields a ...
... 1. There exists a relvar R1 (R1 and R2 not necessarily distinct) with a candidate key CK. 2. It is possible to rename some subset of the attributes of FK, such that FK becomes FK’ (say) and FK’ and CK are of the same (tuple) type. 3. For all time, each value of FK in the current value of R2 yields a ...
SQL(Structured Query Language)
... Oracle Server from any tool or application. Oracle SQL contains many extensions. When you enter a SQL statement, it is stored in a part of memory called the SQL buffer and remains there until you enter a new statement. ...
... Oracle Server from any tool or application. Oracle SQL contains many extensions. When you enter a SQL statement, it is stored in a part of memory called the SQL buffer and remains there until you enter a new statement. ...
Document
... This is a particular case when one table joins to itself, with one or two aliases to avoid confusion. A self join can be of any type, as long as the joined tables are the same. A self join is rather unique in that it involves a relationship with only one table. The common example is when company has ...
... This is a particular case when one table joins to itself, with one or two aliases to avoid confusion. A self join can be of any type, as long as the joined tables are the same. A self join is rather unique in that it involves a relationship with only one table. The common example is when company has ...
p1-programming-constructs-05-12-16
... SQL Summary • SQL is a versatile language that can integrate with numerous 4GL languages and applications • SQL simplifies data manipulation by reducing the amount of code required. • More reliable than creating a database using files with linked-list implementation ...
... SQL Summary • SQL is a versatile language that can integrate with numerous 4GL languages and applications • SQL simplifies data manipulation by reducing the amount of code required. • More reliable than creating a database using files with linked-list implementation ...
30-2-Database-Software
... student can query, insert, update, and delete records in the world database, but he can't change the database schema or indexing, can't grant privileges to others. This command also creates a student user with password secret. ...
... student can query, insert, update, and delete records in the world database, but he can't change the database schema or indexing, can't grant privileges to others. This command also creates a student user with password secret. ...
mod-5
... for each pair of functional dependencies f1and f2 in F + if f1 and f2 can be combined using transitivity then add the resulting functional dependency to F + until F + does not change any further NOTE: We shall see an alternative procedure for this task later ...
... for each pair of functional dependencies f1and f2 in F + if f1 and f2 can be combined using transitivity then add the resulting functional dependency to F + until F + does not change any further NOTE: We shall see an alternative procedure for this task later ...
SQL-DBMS
... data type. If character or dates are used in the list, they must be enclosed in a single quotation mark (‘ ’). ...
... data type. If character or dates are used in the list, they must be enclosed in a single quotation mark (‘ ’). ...
Introduction to Relational Databases and SQL
... Most DBMSs meet SQL89 standards, and many meet SQL92 standards. So to a large extent, SQL written for one DBMS will work in another DBMS with little or no changes. However, every DBMS vendor wants to differentiate its product on the market with more powerful features. In addition, the SQL standard d ...
... Most DBMSs meet SQL89 standards, and many meet SQL92 standards. So to a large extent, SQL written for one DBMS will work in another DBMS with little or no changes. However, every DBMS vendor wants to differentiate its product on the market with more powerful features. In addition, the SQL standard d ...
complete_notes_salal..
... what data are stored in the database, and what relationship exists among those data. The entire database is described in terms of a small number of relatively simple structures. Database Administration (DBA), who must decide what information is to be kept in the database, uses the logical level of ...
... what data are stored in the database, and what relationship exists among those data. The entire database is described in terms of a small number of relatively simple structures. Database Administration (DBA), who must decide what information is to be kept in the database, uses the logical level of ...
cos 346 day 11
... Using aliases for table names improves the readability of a join Example: alias E is assigned to the EMPLOYEE table SELECT P.Name, HoursWorked, E.Name FROM PROJECT P JOIN ASSIGNMENT A ON P.ProjectID = A.ProjectID JOIN EMPLOYEE E ON A.EmployeeNum = E.EmployeeNumber; Copyright © 2004 Database Proc ...
... Using aliases for table names improves the readability of a join Example: alias E is assigned to the EMPLOYEE table SELECT P.Name, HoursWorked, E.Name FROM PROJECT P JOIN ASSIGNMENT A ON P.ProjectID = A.ProjectID JOIN EMPLOYEE E ON A.EmployeeNum = E.EmployeeNumber; Copyright © 2004 Database Proc ...
Document
... We have to guarantee that every did value in Departments appears in a tuple of Works_In – This tuple must also have NOT NULL values in the foreign key fields – This cannot be achieved similar to Manages relationship, because did cannot be taken as the key for Works_In relationship – This situation n ...
... We have to guarantee that every did value in Departments appears in a tuple of Works_In – This tuple must also have NOT NULL values in the foreign key fields – This cannot be achieved similar to Manages relationship, because did cannot be taken as the key for Works_In relationship – This situation n ...