Schema Objects
... INSERT INTO table2 VALUES (1); INSERT INTO table1(id, col1) VALUES (1, 1); INSERT INTO table1(id, col1) VALUES (1, 2); -- error –- referenced record does not exist in table2 DELETE FROM table2 WHERE id = 1; -- record removed -- from table1 ...
... INSERT INTO table2 VALUES (1); INSERT INTO table1(id, col1) VALUES (1, 1); INSERT INTO table1(id, col1) VALUES (1, 2); -- error –- referenced record does not exist in table2 DELETE FROM table2 WHERE id = 1; -- record removed -- from table1 ...
2800 Woods Hollow Rd
... Some older databases were hosted on operating systems that supported a limited number of characters in identifiers, resulting in the use of abbreviated object names, such as “PD” for a table containing product details. If you migrate such a database to SQL Server, you should replace the short identi ...
... Some older databases were hosted on operating systems that supported a limited number of characters in identifiers, resulting in the use of abbreviated object names, such as “PD” for a table containing product details. If you migrate such a database to SQL Server, you should replace the short identi ...
Introduction to MySQL
... Authentication and Login MySQL uses traditional username / password authentication The administrator's user is: root The default password is specified ...
... Authentication and Login MySQL uses traditional username / password authentication The administrator's user is: root The default password is specified ...
Lecture5
... 3. Creating, replacing, altering, and dropping objects(DDL) 4. Controlling access to the database and its objects(DCL) 5. Guaranteeing database consistency and integrity(DCL) ...
... 3. Creating, replacing, altering, and dropping objects(DDL) 4. Controlling access to the database and its objects(DCL) 5. Guaranteeing database consistency and integrity(DCL) ...
PARALLEL EXECUTION FACILITY CONFIGURATION AND USE
... by other parallel operations. If there are more slaves than PARALLEL_MIN_SERVERS in the PX slave pool, the excessive slaves will be terminated after a five minute period of inactivity. For example, let’s say that PARALLEL_MIN_SERVERS=16 and PARALLEL_MAX_SERVERS=64 and all 64 slaves are active in the ...
... by other parallel operations. If there are more slaves than PARALLEL_MIN_SERVERS in the PX slave pool, the excessive slaves will be terminated after a five minute period of inactivity. For example, let’s say that PARALLEL_MIN_SERVERS=16 and PARALLEL_MAX_SERVERS=64 and all 64 slaves are active in the ...
... SQL query by transforming query conditions to a fuzzy scope. After that, change it to precise SQL clause. This procedure is easy and consistent with ordinary query, but lacks flexibility. Sometime it is apt to produce query errors. The second approach is to assume that the database is fuzzy sets and ...
Connecting an ArcIMS Site to an External Database
... to access an external database. In some cases, this functionality may be required. For example, a county may store parcel polygons as GIS layers in one department and maintain other attributes in an external database in another department. To provide access to an external databases, ArcIMS Web sites ...
... to access an external database. In some cases, this functionality may be required. For example, a county may store parcel polygons as GIS layers in one department and maintain other attributes in an external database in another department. To provide access to an external databases, ArcIMS Web sites ...
SQL Server Indexing for the Client Developer
... Clustered Indexes 1 Clustered Index per table Contain Full Copy of row data within in the index Up to 16 indexed columns can be part of the index (15 if the table contains any XML indexes) Primary Key will by default be the Clustered Index Must be created on the same filegroup as the ta ...
... Clustered Indexes 1 Clustered Index per table Contain Full Copy of row data within in the index Up to 16 indexed columns can be part of the index (15 if the table contains any XML indexes) Primary Key will by default be the Clustered Index Must be created on the same filegroup as the ta ...
SQL Azure Introduction
... When first announce at Professional Developers Conference 2008, Windows Azure did not have a relational database component. There was a persistent structured storage capability (not unlike table storage), but it was not relational database technology. Microsoft added SQL Azure because of the feedbac ...
... When first announce at Professional Developers Conference 2008, Windows Azure did not have a relational database component. There was a persistent structured storage capability (not unlike table storage), but it was not relational database technology. Microsoft added SQL Azure because of the feedbac ...
Database Management System (DBMS) an Introduction
... intermediary between the users and the DBMS • Application program that read or modify database data by sending SQL statements to DBMS. • Application program to present data to users in the format of forms and reports. ...
... intermediary between the users and the DBMS • Application program that read or modify database data by sending SQL statements to DBMS. • Application program to present data to users in the format of forms and reports. ...
Updatable Views in Object-Oriented Database Systems
... Metadata information related to data and services. Formally, an ontology is defined as a specification of conceptualization [GrOl94], i.e. a description (like a formal specification of a program) of the concepts and relationships that can exist in a particular data/service environment. The postula ...
... Metadata information related to data and services. Formally, an ontology is defined as a specification of conceptualization [GrOl94], i.e. a description (like a formal specification of a program) of the concepts and relationships that can exist in a particular data/service environment. The postula ...
The Java Series: Introduction to JDBC
... • PL/SQL is a functional language through which we can also issue SQL statements. • Also, Oracle is “aware” of PL/SQL: if we change the structure of a table, Oracle can tell us what stored procedures might fail (for instance, because they are using fields we have removed or modified). • Thus, it’s C ...
... • PL/SQL is a functional language through which we can also issue SQL statements. • Also, Oracle is “aware” of PL/SQL: if we change the structure of a table, Oracle can tell us what stored procedures might fail (for instance, because they are using fields we have removed or modified). • Thus, it’s C ...
LN3
... Key of a Relation: – Each row has a value of a data item (or set of items) that uniquely identifies that row in the table • Called the key – In the STUDENT table, SSN is the key – Sometimes row-ids or sequential numbers are assigned as keys to identify the rows in a table • Called artificial key o ...
... Key of a Relation: – Each row has a value of a data item (or set of items) that uniquely identifies that row in the table • Called the key – In the STUDENT table, SSN is the key – Sometimes row-ids or sequential numbers are assigned as keys to identify the rows in a table • Called artificial key o ...
Performance
... Reduce lock contention Rewriting of queries to improve performance was important in the past, but smart optimizers have made this less important Communication overhead and query handling overheads significant part of cost of each call ...
... Reduce lock contention Rewriting of queries to improve performance was important in the past, but smart optimizers have made this less important Communication overhead and query handling overheads significant part of cost of each call ...
Fast Track to Hibernate: Using Hibernate For Java Database Access
... you will learn how to create and maintain applications using Hibernate. Students will run Hibernate using different platforms including Hibernate 3.2, Derby Database, Java 5, Eclipse 3.3/Europa, and Apache Ant 1.7.0. This course covers all the important concepts necessary to access and update data s ...
... you will learn how to create and maintain applications using Hibernate. Students will run Hibernate using different platforms including Hibernate 3.2, Derby Database, Java 5, Eclipse 3.3/Europa, and Apache Ant 1.7.0. This course covers all the important concepts necessary to access and update data s ...
Introduction to database design
... – MySQL: Not case sensitive! ‘Green’=‘green’ – Concatenation: ‘Data’ || ‘base’ = ‘Database’ – LIKE, ‘Dat_b%’ LIKE ‘Database’ • _ matches any single character • % matches any string of 0 or more characters • Car.Color=‘%green%’ is true for all colors with ‘green’ as a substring, e.g. ‘lightgreen’ ‘gr ...
... – MySQL: Not case sensitive! ‘Green’=‘green’ – Concatenation: ‘Data’ || ‘base’ = ‘Database’ – LIKE, ‘Dat_b%’ LIKE ‘Database’ • _ matches any single character • % matches any string of 0 or more characters • Car.Color=‘%green%’ is true for all colors with ‘green’ as a substring, e.g. ‘lightgreen’ ‘gr ...
Syllabus - Marwadi University
... maintained. Thereby, data can be stored in complex data structures that permit efficient retrieval, yet users see a simplified and easy-to-use view of the data. The lowest level of abstraction, the physical level, describes how the data are actually stored and details the data structures. The next-h ...
... maintained. Thereby, data can be stored in complex data structures that permit efficient retrieval, yet users see a simplified and easy-to-use view of the data. The lowest level of abstraction, the physical level, describes how the data are actually stored and details the data structures. The next-h ...
IBM Research Report
... alternative hierarchy is one based on which company manufactures the product and who owns that company, namely, product ! manufacturer ! parent company (of interest to a stock market analyst). Roll-ups/drill-downs can be on either of the hierarchies. Support for computing ad-hoc aggregates. That i ...
... alternative hierarchy is one based on which company manufactures the product and who owns that company, namely, product ! manufacturer ! parent company (of interest to a stock market analyst). Roll-ups/drill-downs can be on either of the hierarchies. Support for computing ad-hoc aggregates. That i ...