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... R could have been a single relation containing all attributes that are of interest (called universal relation). R could have been the result of some ad hoc design of relations, which we then test/convert to normal form. ...
... R could have been a single relation containing all attributes that are of interest (called universal relation). R could have been the result of some ad hoc design of relations, which we then test/convert to normal form. ...
Standard Query Language (SQL)
... SQL has gone through many standards: starting with SQL-86 or SQL 1.A. SQL-92 is referred to as SQL-2. Later standards (from SQL-1999) are divided into core specification and specialized extensions. The extensions are implemented for different applications – such as data mining, data warehousing, ...
... SQL has gone through many standards: starting with SQL-86 or SQL 1.A. SQL-92 is referred to as SQL-2. Later standards (from SQL-1999) are divided into core specification and specialized extensions. The extensions are implemented for different applications – such as data mining, data warehousing, ...
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... Symbol table contains information for each distinct key value. Each key value is assigned a unique code Code is 1, 2, or 4 bytes - depending on number of distinct key values Rather than a bit array for each distinct key value, the index has one array of codes (a.k.a., the Vector) ...
... Symbol table contains information for each distinct key value. Each key value is assigned a unique code Code is 1, 2, or 4 bytes - depending on number of distinct key values Rather than a bit array for each distinct key value, the index has one array of codes (a.k.a., the Vector) ...
Lesson-A
... The Oracle DBMS implements transaction processing by locking data rows associated with pending transactions. When the DBMS locks a row, other users cannot view or modify the row. When the user commits the transaction, the DBMS releases the lock on the rows, and other users can view and update the ro ...
... The Oracle DBMS implements transaction processing by locking data rows associated with pending transactions. When the DBMS locks a row, other users cannot view or modify the row. When the user commits the transaction, the DBMS releases the lock on the rows, and other users can view and update the ro ...
Modeling Data for Business Processes
... studies a new approach to modeling data for business processes: representing data used by a process as a hierarchically structured business entity with (i) keys, local keys, and update constraints, and (ii) a set of data mapping rules defining exact correspondence between entity data values and valu ...
... studies a new approach to modeling data for business processes: representing data used by a process as a hierarchically structured business entity with (i) keys, local keys, and update constraints, and (ii) a set of data mapping rules defining exact correspondence between entity data values and valu ...
File - You have to dream before your dreams can come
... However, some dynamic queries require complex coding, the use of special data structures, and more runtime processing. While you might not notice the added processing time, you might find the coding difficult unless you fully understand dynamic SQL concepts and methods. When to Use Dynamic SQL In pr ...
... However, some dynamic queries require complex coding, the use of special data structures, and more runtime processing. While you might not notice the added processing time, you might find the coding difficult unless you fully understand dynamic SQL concepts and methods. When to Use Dynamic SQL In pr ...
The Query Optimizer in Oracle Database 12c – What`s New?
... For performance purposes it’s sometimes not necessary to index all data stored in a table For example, it might be enough to index data of the last day or week and to leave older data un-indexed Through 11.2 some kind of partial indexes are supported by implementing particular tricks Making ...
... For performance purposes it’s sometimes not necessary to index all data stored in a table For example, it might be enough to index data of the last day or week and to leave older data un-indexed Through 11.2 some kind of partial indexes are supported by implementing particular tricks Making ...
Database Concepts - College of Computing
... a FLIGHT# in FLIGHT-SCHEDULE cannot be null because it models the existence of an entity in the real world a FLIGHT# in DEPT-AIRPORT must exist in FLIGHT-SCHEDULE because it doesn’t make sense for a non-existing FLIGHTSCHEDULE entity to have a DEPT-AIRPORT ...
... a FLIGHT# in FLIGHT-SCHEDULE cannot be null because it models the existence of an entity in the real world a FLIGHT# in DEPT-AIRPORT must exist in FLIGHT-SCHEDULE because it doesn’t make sense for a non-existing FLIGHTSCHEDULE entity to have a DEPT-AIRPORT ...
ECP2.1 Upgrade Client
... 1. If external database is used then restore the database using the backup created during the ECP upgrade (Backup of ECP). 2. Shutdown the integrated database if it is used. 3. Restore the ECP directory using the backup created during the ECP upgrade (Backup of ECP). 4. Startup the integrated databa ...
... 1. If external database is used then restore the database using the backup created during the ECP upgrade (Backup of ECP). 2. Shutdown the integrated database if it is used. 3. Restore the ECP directory using the backup created during the ECP upgrade (Backup of ECP). 4. Startup the integrated databa ...
Chapter 22: Relational Databases
... Notice in Figure 4 that there is now a Customer_Number column in both the Customer table and the Invoice table. Now all invoices for Sam’s Small Appliances share only the customer number. The two tables are linked by the Customer_Number field. To find out more details about this customer, you need t ...
... Notice in Figure 4 that there is now a Customer_Number column in both the Customer table and the Invoice table. Now all invoices for Sam’s Small Appliances share only the customer number. The two tables are linked by the Customer_Number field. To find out more details about this customer, you need t ...
chapter 7_ database administration
... data to enter in the WAREHOUSE column. The only possibility would be NULL. Therefore, if every column not included in a view can accept nulls, you can add new rows using the INSERT command. There is another problem, however. Suppose the user attempts to add a row to the HOUSEWARES view containing th ...
... data to enter in the WAREHOUSE column. The only possibility would be NULL. Therefore, if every column not included in a view can accept nulls, you can add new rows using the INSERT command. There is another problem, however. Suppose the user attempts to add a row to the HOUSEWARES view containing th ...
Developing a database for Genbank information.
... GenBank is a data store containing over 100 gigabytes of compressed information of DNA and protein sequences. Expressed Sequence Tags (EST) information is one type of data housed within GenBank. Access to EST information is in one of two main forms. The first is through the National Center for Biote ...
... GenBank is a data store containing over 100 gigabytes of compressed information of DNA and protein sequences. Expressed Sequence Tags (EST) information is one type of data housed within GenBank. Access to EST information is in one of two main forms. The first is through the National Center for Biote ...
select
... Subqueries in the From Clause • SQL allows a subquery expression to be used in the from clause • Find the average instructors’ salaries of those departments where the average salary is greater than $42,000. – select dept_name, avg_salary from (select dept_name, avg (salary) as avg_salary from instr ...
... Subqueries in the From Clause • SQL allows a subquery expression to be used in the from clause • Find the average instructors’ salaries of those departments where the average salary is greater than $42,000. – select dept_name, avg_salary from (select dept_name, avg (salary) as avg_salary from instr ...
- Sacramento - California State University
... is to store and retrieve related information. A database server is the key to solving the problems of information management. In general, a server reliably manages a large amount of data in a multiuser environment so that many users can concurrently access the same data. All this is accomplished whi ...
... is to store and retrieve related information. A database server is the key to solving the problems of information management. In general, a server reliably manages a large amount of data in a multiuser environment so that many users can concurrently access the same data. All this is accomplished whi ...
No Slide Title
... A stored procedure is a PL/SQL or Java program stored within the database Oracle triggers are PL/SQL or Java procedures that are invoked when specified database activity occurs ...
... A stored procedure is a PL/SQL or Java program stored within the database Oracle triggers are PL/SQL or Java procedures that are invoked when specified database activity occurs ...
R - CSE, IIT Bombay
... All database provide ways to view query execution plans E.g. in PostgreSQL, prefix an SQL query with the keyword explain to ...
... All database provide ways to view query execution plans E.g. in PostgreSQL, prefix an SQL query with the keyword explain to ...
Database Application Development
... SQLJ Complements JDBC with a (semi-)static query model: Compiler can perform syntax checks, strong type checks, consistency of the query with the schema All arguments always bound to the same variable: ...
... SQLJ Complements JDBC with a (semi-)static query model: Compiler can perform syntax checks, strong type checks, consistency of the query with the schema All arguments always bound to the same variable: ...
Setting Up a Hot Standby Database
... • The primary control file cannot be used as-is, because the control file has .dbf and redo file locations for primary. • Instead of creating a new control file, the primary control file is adapted for use by the standby. • Without some type of correction, the standby will look in the wrong location ...
... • The primary control file cannot be used as-is, because the control file has .dbf and redo file locations for primary. • Instead of creating a new control file, the primary control file is adapted for use by the standby. • Without some type of correction, the standby will look in the wrong location ...
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... Next we must execute the SQL script from Forefront TMG to create the required tables, views and fields for the SQL Server database. Start the SQL Server Management Studio application and start a new query and paste the entire SQL script into the query editor and execute the query. To the same for th ...
... Next we must execute the SQL script from Forefront TMG to create the required tables, views and fields for the SQL Server database. Start the SQL Server Management Studio application and start a new query and paste the entire SQL script into the query editor and execute the query. To the same for th ...
Service Catalogs: Defining Standardized Database Services
... straightforward to provide the selected service. The cost model is also very simple, and reflects the bank’s decision to leverage the economics of standardization and consolidation by providing every consumer with the same high degree of availability and ...
... straightforward to provide the selected service. The cost model is also very simple, and reflects the bank’s decision to leverage the economics of standardization and consolidation by providing every consumer with the same high degree of availability and ...
DB2 Concepts and Terminology for Oracle Professionals Antonio Maranhao, Presenter
... Moving to the next slide, so now you have your DB2 product installed and hopefully you’re going to also have one default instance created. Here are some commands to get you started and the counterparts in Oracle as well. So for example, to start a database instance is very simple. You have to log in ...
... Moving to the next slide, so now you have your DB2 product installed and hopefully you’re going to also have one default instance created. Here are some commands to get you started and the counterparts in Oracle as well. So for example, to start a database instance is very simple. You have to log in ...