Views - NTOU 》資料庫實驗室
... create view v as < query expression > where is any legal SQL expression. The view
name is represented by v.
Once a view is defined, the view name can be used to refer to the
...
... create view v as < query expression > where
Oracle PL/SQL - Gunadarma University
... Triggers are implicitly executed (fired) when the triggering event occurs Triggers should not be used as a lazy way to invoke a procedure as they are fired every time the event occurs ...
... Triggers are implicitly executed (fired) when the triggering event occurs Triggers should not be used as a lazy way to invoke a procedure as they are fired every time the event occurs ...
Tracking Specification Requirements Evolution: Database Approach
... that can interact successfully with each other without studying different details of the interaction target. A common way to create software standards texts is to simply write them manually with the deep study of subjects in question and carefull checking of the text. Usually different templates are ...
... that can interact successfully with each other without studying different details of the interaction target. A common way to create software standards texts is to simply write them manually with the deep study of subjects in question and carefull checking of the text. Usually different templates are ...
Sedna: native XML database management system (internals overview)
... or (2) direct pointers. Location-independent pointers remain valid even if a pointed XML node physically moves within a database (e.g. as an effect of executing updates over an XML document). On the other hand, direct pointers allow traversing an XML tree faster when executing XML queries. In Sedna, ...
... or (2) direct pointers. Location-independent pointers remain valid even if a pointed XML node physically moves within a database (e.g. as an effect of executing updates over an XML document). On the other hand, direct pointers allow traversing an XML tree faster when executing XML queries. In Sedna, ...
viva voce questions
... Ans.A deadlock is a situation that can occur in multi-user systems that prevents some transactions from continuing work. A deadlock can occur when two or more users are waiting for data locked by each other. 56. What is two phase commit? Ans.Prepare phase and commit phase. The prepare/commit mechani ...
... Ans.A deadlock is a situation that can occur in multi-user systems that prevents some transactions from continuing work. A deadlock can occur when two or more users are waiting for data locked by each other. 56. What is two phase commit? Ans.Prepare phase and commit phase. The prepare/commit mechani ...
CS 579 Database Systems
... Relational Mapping of 1:M Relationships Relational Mapping Exercises Mapping Reflexive Relationships Conceptual & Relational Models Defining and Changing Attributes Assigning Sequential & Unique Values to Attributes Metadata & System Data © Ellis Cohen 2001-2008 ...
... Relational Mapping of 1:M Relationships Relational Mapping Exercises Mapping Reflexive Relationships Conceptual & Relational Models Defining and Changing Attributes Assigning Sequential & Unique Values to Attributes Metadata & System Data © Ellis Cohen 2001-2008 ...
JDBC (Java DataBase Connectivity)
... String query = " select students, grade from class where type=‘really listening this presentation’ “; ResultSet rs = stmt.executeQuery( query ); ...
... String query = " select students, grade from class where type=‘really listening this presentation’ “; ResultSet rs = stmt.executeQuery( query ); ...
ACTIVE Deliverable template - PlanetData
... area clusters and provide guidance to use these tools and computing infrastructures. We address Apache Hadoop, one of the most widely used software libraries to perform large-scale data analysis tasks on clusters of computers in parallel. Hadoop is a software library that provides a reliable shared ...
... area clusters and provide guidance to use these tools and computing infrastructures. We address Apache Hadoop, one of the most widely used software libraries to perform large-scale data analysis tasks on clusters of computers in parallel. Hadoop is a software library that provides a reliable shared ...
The Hobgoblin of Little Minds
... In the serializable isolation level, transactions must execute in such a way that they appear to be executed one at a time (“serially”), rather than concurrently. […] In other words, concurrent transactions executing in serializable mode are only permitted to make database changes they could have ma ...
... In the serializable isolation level, transactions must execute in such a way that they appear to be executed one at a time (“serially”), rather than concurrently. […] In other words, concurrent transactions executing in serializable mode are only permitted to make database changes they could have ma ...
cursor
... SQL in Real Programs We have seen only how SQL is used at the generic query interface --- an environment where we sit at a terminal and ask queries of a database. Reality is almost always different: conventional programs interacting with SQL. ...
... SQL in Real Programs We have seen only how SQL is used at the generic query interface --- an environment where we sit at a terminal and ask queries of a database. Reality is almost always different: conventional programs interacting with SQL. ...
Automated Ranking of Database Query Results
... We start by briefly reviewing this standard IR technique. Given a set of documents and a query (the latter specified as a set of keywords), the problem is to retrieve the Top-K documents most relevant, or most similar to the query. Similarity between a document and the query is formalized as follow ...
... We start by briefly reviewing this standard IR technique. Given a set of documents and a query (the latter specified as a set of keywords), the problem is to retrieve the Top-K documents most relevant, or most similar to the query. Similarity between a document and the query is formalized as follow ...
Table 9-1. Basic SQL to Java Type Mappings
... responsibility of the JDBC driver to provide the proper termination. The easiest way to include variables in SQL statements when using JDBC is to generate the SQL statement dynamically. Suppose that we wish to add another row to our table above and that we have the values in Java variables. We can c ...
... responsibility of the JDBC driver to provide the proper termination. The easiest way to include variables in SQL statements when using JDBC is to generate the SQL statement dynamically. Suppose that we wish to add another row to our table above and that we have the values in Java variables. We can c ...
PL/SQL
... translates the query into a machine language format. The system stores the parsed query in the cursor’s context area and creates the memory structure that will store the active set. The cursor does not retrieve the data values at this stage. ...
... translates the query into a machine language format. The system stores the parsed query in the cursor’s context area and creates the memory structure that will store the active set. The cursor does not retrieve the data values at this stage. ...
Distributed and Parallel Database Systems
... because it enables the placement of data in close proximity to its place of use, thus potentially reducing transmission cost, and it reduces the size of relations that are involved in user queries. Based on the user access patterns, each of the fragments may also be replicated. This is preferable wh ...
... because it enables the placement of data in close proximity to its place of use, thus potentially reducing transmission cost, and it reduces the size of relations that are involved in user queries. Based on the user access patterns, each of the fragments may also be replicated. This is preferable wh ...
Getting to Know the SQL Server Management Studio
... Data replication is the capability of a system to make copies of its data and application objects automatically in remote locations. You easily can propagate any changes to the original or data changes to the copies to all the other copies. Data replication enables users to make changes to data offl ...
... Data replication is the capability of a system to make copies of its data and application objects automatically in remote locations. You easily can propagate any changes to the original or data changes to the copies to all the other copies. Data replication enables users to make changes to data offl ...
PS1
... • Spherical/HTM (C# library + SQL glue) – Spatial index (Hierarchical Triangular Mesh) • Zones (SQL library) – Alternate spatial decomposition with dec zones • Many stored procedures and functions – From coordinate conversions to neighbor search functions • Self-extracting documentation (metadata) a ...
... • Spherical/HTM (C# library + SQL glue) – Spatial index (Hierarchical Triangular Mesh) • Zones (SQL library) – Alternate spatial decomposition with dec zones • Many stored procedures and functions – From coordinate conversions to neighbor search functions • Self-extracting documentation (metadata) a ...
Special Interest Activity
... login to PostgreSQL, which should have been created along with your PostgreSQL installation and which will be used by TrioExplorer to create new user roles and database instances. ◦ TrioExplorer should now be reachable from your browser using http://localhost:8080/. For new users can now press ‘Crea ...
... login to PostgreSQL, which should have been created along with your PostgreSQL installation and which will be used by TrioExplorer to create new user roles and database instances. ◦ TrioExplorer should now be reachable from your browser using http://localhost:8080/. For new users can now press ‘Crea ...
ONLINE-EXTRA CONTENT Optimizing Disaster Recovery Using
... On the standby database, this query shows the maximum sequence number recovered for each thread. This should match the output from the previous query. For further details, refer to “Monitoring Log Apply Services for Physical Standby Databases” in the Oracle9i Data Guard Concepts and Administration m ...
... On the standby database, this query shows the maximum sequence number recovered for each thread. This should match the output from the previous query. For further details, refer to “Monitoring Log Apply Services for Physical Standby Databases” in the Oracle9i Data Guard Concepts and Administration m ...
Simple Databases
... • You cannot edit (delete, insert, or update) a view • Also an example of nested queries ...
... • You cannot edit (delete, insert, or update) a view • Also an example of nested queries ...
relation - Csmaster
... if it is in first normal form and all the nonkey attributes are fully functionally dependent on the key. – No non-key attribute is FD on just part of the key – If R’s key has only one attribute (ie, is not composite), and R is 1NF, R is automatically in 2NF DAVID M. KROENKE’S DATABASE PROCESSING, 10 ...
... if it is in first normal form and all the nonkey attributes are fully functionally dependent on the key. – No non-key attribute is FD on just part of the key – If R’s key has only one attribute (ie, is not composite), and R is 1NF, R is automatically in 2NF DAVID M. KROENKE’S DATABASE PROCESSING, 10 ...
Configuring Oracle on Linux For Peak Performance
... Choose to create a filesystem-based database Specify the mount point for the database Choose the character sets for the database Choose database passwords Choose whether to load SQL*Plus help and ...
... Choose to create a filesystem-based database Specify the mount point for the database Choose the character sets for the database Choose database passwords Choose whether to load SQL*Plus help and ...