Creating the data foundation
... column from the employee table except that it is a string, starting with an i followed by the users user_id represented as a 5 character string with leading zeros. Close the Show values window Link the employee tables user_id column to the user_data tables logon column Right-click on the new join an ...
... column from the employee table except that it is a string, starting with an i followed by the users user_id represented as a 5 character string with leading zeros. Close the Show values window Link the employee tables user_id column to the user_data tables logon column Right-click on the new join an ...
SELECT
... SQL has one basic statement for retrieving information from a database; the SELECT statement This is not the same as the SELECT operation of the relational algebra ...
... SQL has one basic statement for retrieving information from a database; the SELECT statement This is not the same as the SELECT operation of the relational algebra ...
IS 257: Database Management - Courses
... Finding Frequent Pairs • The simplest case is when we only want to find “frequent pairs” of items. • Assume data is in a relation Baskets(basket, item). • The support threshold s is the minimum number of baskets in which a pair appears before we are interested. ...
... Finding Frequent Pairs • The simplest case is when we only want to find “frequent pairs” of items. • Assume data is in a relation Baskets(basket, item). • The support threshold s is the minimum number of baskets in which a pair appears before we are interested. ...
The Client/Server Database Environment
... Entire files are transferred from the server to the client for processing Problems: ...
... Entire files are transferred from the server to the client for processing Problems: ...
Document
... a loan amount; these relationships are independent, hence we have the join dependency *(=(loan-number, branch-name), (loan-number, customer-name), (loan- ...
... a loan amount; these relationships are independent, hence we have the join dependency *(=(loan-number, branch-name), (loan-number, customer-name), (loan- ...
notes #13
... • List must be specified if there is any ambiguity in a column name. • The subselect is known as the defining query. • WITH CHECK OPTION ensures that if a row fails to satisfy WHERE clause of defining query, it is not added to underlying base table. • Need SELECT privilege on all tables referenced i ...
... • List must be specified if there is any ambiguity in a column name. • The subselect is known as the defining query. • WITH CHECK OPTION ensures that if a row fails to satisfy WHERE clause of defining query, it is not added to underlying base table. • Need SELECT privilege on all tables referenced i ...
Ch17: concurency control
... Serial schedule: Schedule that does not interleave the actions of different transactions. Equivalent schedules: For any database state, the effect (on the set of objects in the database) of executing the first schedule is identical to the effect of executing the ...
... Serial schedule: Schedule that does not interleave the actions of different transactions. Equivalent schedules: For any database state, the effect (on the set of objects in the database) of executing the first schedule is identical to the effect of executing the ...
select-list
... and the remaining tuples are partitioned into groups by the value of attributes in grouping-list. The group-qualification is then applied to eliminate some groups. Expressions in group-qualification must have a single value per group! • In effect, an attribute in group-qualification that is not an a ...
... and the remaining tuples are partitioned into groups by the value of attributes in grouping-list. The group-qualification is then applied to eliminate some groups. Expressions in group-qualification must have a single value per group! • In effect, an attribute in group-qualification that is not an a ...
Comparing Data Integration Algorithms
... characteristic of being able to answer queries in terms of the global schema exists. Furthermore, in both cases queries over this mediated schema have to be translated in terms of a set of queries over the component data sources [1]. However, query processing using the local-as-view approach is diff ...
... characteristic of being able to answer queries in terms of the global schema exists. Furthermore, in both cases queries over this mediated schema have to be translated in terms of a set of queries over the component data sources [1]. However, query processing using the local-as-view approach is diff ...
1 INF312 - Advanced Database Systems INF312 - Advanced
... Objects with OIDs and literals without, as before An object’s attributes and relationships to other objects are properties that make up the object’s state; Operations are properties as well, and make up the behavior of the object. Objects are instances of types within a super- and sub-type hierarchy ...
... Objects with OIDs and literals without, as before An object’s attributes and relationships to other objects are properties that make up the object’s state; Operations are properties as well, and make up the behavior of the object. Objects are instances of types within a super- and sub-type hierarchy ...
ppt
... studioName = ‘Paramount’ Movie replace virtual table by its view definition © CIS 4301 - Spring 2006 ...
... studioName = ‘Paramount’ Movie replace virtual table by its view definition © CIS 4301 - Spring 2006 ...
SID/SSN Modifications Project
... the transfer database and the SID-SSN combination is stored in the Central Database. 3. The student applies to your college. You press ADD to create a new student record (without entering SSN first). Since there is no SSN when ADD is pressed, a new SID is assigned immediately. 4. You enter the stude ...
... the transfer database and the SID-SSN combination is stored in the Central Database. 3. The student applies to your college. You press ADD to create a new student record (without entering SSN first). Since there is no SSN when ADD is pressed, a new SID is assigned immediately. 4. You enter the stude ...
Data Mining and Data Warehousing
... Major task of traditional relational DBMS Day-to-day operations: purchasing, inventory, banking, manufacturing, payroll, registration, accounting, etc. ...
... Major task of traditional relational DBMS Day-to-day operations: purchasing, inventory, banking, manufacturing, payroll, registration, accounting, etc. ...
Title of Presentation
... during a read of page (1:143) in database ID 8 at offset 0x0000000011e000 in file 'c:\sqlDB\CORRUPT.mdf'. Additional messages in the SQL Server error log or system event log may provide more detail. This is a severe error condition that threatens database integrity and must be corrected immediately. ...
... during a read of page (1:143) in database ID 8 at offset 0x0000000011e000 in file 'c:\sqlDB\CORRUPT.mdf'. Additional messages in the SQL Server error log or system event log may provide more detail. This is a severe error condition that threatens database integrity and must be corrected immediately. ...
ch7
... • Helps organize and outline what should be in the database • Does not contain much real information ...
... • Helps organize and outline what should be in the database • Does not contain much real information ...
Chapter 14: Query Optimization
... expressions equivalent to the given expression Conceptually, generate all equivalent expressions by repeatedly executing the following step until no more expressions can be found Very expensive in space and time Space requirements reduced by sharing common subexpressions: ...
... expressions equivalent to the given expression Conceptually, generate all equivalent expressions by repeatedly executing the following step until no more expressions can be found Very expensive in space and time Space requirements reduced by sharing common subexpressions: ...
Constraint-Based, Multidimensional Data Mining
... expressed in a data mining query language (DMQL1) as shown in Figure 1a. This mining query may allow the generation of association rules like those shown in Figure 1b. The rules mean that if a customer in Vancouver bought Census_CD and MS Office 97, there is a 68 percent probability that he will als ...
... expressed in a data mining query language (DMQL1) as shown in Figure 1a. This mining query may allow the generation of association rules like those shown in Figure 1b. The rules mean that if a customer in Vancouver bought Census_CD and MS Office 97, there is a 68 percent probability that he will als ...
Understanding and Selecting a Database Activity
... systems (DBMSs) across multiple platforms (Windows vs. Unix vs. ...). The DAM tool aggregates collected information from multiple collectors to a central, secure server. In some cases the central server/management console also collects information while in other cases it serves merely as a repositor ...
... systems (DBMSs) across multiple platforms (Windows vs. Unix vs. ...). The DAM tool aggregates collected information from multiple collectors to a central, secure server. In some cases the central server/management console also collects information while in other cases it serves merely as a repositor ...
DBC-e03-Appenix-C-PP
... enter the SQL for the view just as you would enter the SQL for a query, and then click the Execute button to create the query The “Command(s) completed successfully” message in the Messages window indicates that the view has been created The new view appears in the expanded Views folder after it is ...
... enter the SQL for the view just as you would enter the SQL for a query, and then click the Execute button to create the query The “Command(s) completed successfully” message in the Messages window indicates that the view has been created The new view appears in the expanded Views folder after it is ...
Temporal Data and The Relational Model
... where f and t are DATE, TIME or TIMESTAMP expressions of the same type (i.e., same precision and scale) N.B. PERIOD is not an operator! It’s just a “noise” word. ...
... where f and t are DATE, TIME or TIMESTAMP expressions of the same type (i.e., same precision and scale) N.B. PERIOD is not an operator! It’s just a “noise” word. ...
Database model
A database model is a type of data model that determines the logical structure of a database and fundamentally determines in which manner data can be stored, organized, and manipulated. The most popular example of a database model is the relational model, which uses a table-based format.