Optimizing Queries with Expensive Predicates
... It is expected that these researchers will be writing queries with expensive functions to analyze this data. A benchmark of such queries is presented in [SFGM93]. Ibaraki and Kameda [IK84], Krishnamurthy, Boral and Zaniolo [KBZ86], and Swami and Iyer [SI92] have developed and refined a query optimiz ...
... It is expected that these researchers will be writing queries with expensive functions to analyze this data. A benchmark of such queries is presented in [SFGM93]. Ibaraki and Kameda [IK84], Krishnamurthy, Boral and Zaniolo [KBZ86], and Swami and Iyer [SI92] have developed and refined a query optimiz ...
GAMMA - A High Performance Dataflow Database Machine
... the most successful one (the IDM500) does not exploit parallelism in any form. Why is this so? First, it is obviously much easier to develop a new database machine on paper than it is to turn the idea into a working prototype that can be measured and evaluated. Second, most academic researchers simp ...
... the most successful one (the IDM500) does not exploit parallelism in any form. Why is this so? First, it is obviously much easier to develop a new database machine on paper than it is to turn the idea into a working prototype that can be measured and evaluated. Second, most academic researchers simp ...
SQLite - Introduction
... • It makes minimal use of the standard C library. • Useful for embedded devices. Serverless: • Process that access the database reads and writes directly from the database files on disk. ...
... • It makes minimal use of the standard C library. • Useful for embedded devices. Serverless: • Process that access the database reads and writes directly from the database files on disk. ...
Dynamic Data Selection Lists in SAS/AF Programming Entries
... SELCOLOR and SELSIZE for the other screening columns (see the complete example listing at the end of this paper). Expressions for numeric-valued columns would have to be defined appropriately. ...
... SELCOLOR and SELSIZE for the other screening columns (see the complete example listing at the end of this paper). Expressions for numeric-valued columns would have to be defined appropriately. ...
New Era of Object-Relational Approaches As mentioned in the
... POET, ONTOS, Objectivity, GemStone, and ObjectStore have been developed by both industrial and research laboratories around the world (Deux, 1990; Kim, 1990; Robie, Lapp, & Achach, 1998; Stonebraker, 1990). Nevertheless, object-oriented databases are still not as widely used as relational databases ...
... POET, ONTOS, Objectivity, GemStone, and ObjectStore have been developed by both industrial and research laboratories around the world (Deux, 1990; Kim, 1990; Robie, Lapp, & Achach, 1998; Stonebraker, 1990). Nevertheless, object-oriented databases are still not as widely used as relational databases ...
QFix: Demonstrating error diagnosis in query histories
... the root problem, making it more difficult to find both the erroneous query and the other affected data. Furthermore, a data-centric approach must repair all errors — a nonrepaired value such as the incorrect tax rate may continue to introduce errors in the database through future queries (e.g., ins ...
... the root problem, making it more difficult to find both the erroneous query and the other affected data. Furthermore, a data-centric approach must repair all errors — a nonrepaired value such as the incorrect tax rate may continue to introduce errors in the database through future queries (e.g., ins ...
ADM12 File
... columns. Thus a vertical fragment of a relation will contain values of selected columns. There is no selection condition used in vertical fragmentation. Consider the Employee relation. A vertical fragment of can be created by keeping the values of Name, Bdate, Sex, and Address. Because there is no c ...
... columns. Thus a vertical fragment of a relation will contain values of selected columns. There is no selection condition used in vertical fragmentation. Consider the Employee relation. A vertical fragment of can be created by keeping the values of Name, Bdate, Sex, and Address. Because there is no c ...
Ch6
... SCHEMA–defines a portion of the database owned by a particular user CREATE TABLE–defines a new table and its columns CREATE VIEW–defines a logical table from one or more tables or views 由一至多張表格所構成的虛 擬表格 (視界) ...
... SCHEMA–defines a portion of the database owned by a particular user CREATE TABLE–defines a new table and its columns CREATE VIEW–defines a logical table from one or more tables or views 由一至多張表格所構成的虛 擬表格 (視界) ...
as select branch_name
... formation of groups whereas predicates in the where clause are applied before forming groups ...
... formation of groups whereas predicates in the where clause are applied before forming groups ...
Structured Query Language (SQL)
... 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
...
... actual name of the item named generically between the "<>" • Example: "SELECT
Tuning Mondrian Performance
... When Mondrian initializes and starts to process the first queries, it makes SQL calls to get member lists and determine cardinality, and then to load segments into the cache. When Mondrian is closed and restarted, it has to do that work again. This can be a significant chunk of time depending on the ...
... When Mondrian initializes and starts to process the first queries, it makes SQL calls to get member lists and determine cardinality, and then to load segments into the cache. When Mondrian is closed and restarted, it has to do that work again. This can be a significant chunk of time depending on the ...
Systematic Approach for Information Systems Reengineering
... data as related to the complete meaning of the world. It is the primary tool for designing a database. The basic components of such a data model include: ...
... data as related to the complete meaning of the world. It is the primary tool for designing a database. The basic components of such a data model include: ...
Notes on Slick - The Risberg Family
... Look again at Table 2.1, “The value of the suppliers Relation, represented as a table”. While the names of each attribute appearing in the column headings might suggest the meaning of the columns, in the context of the hypothetical business using this relation, these data are intended to represent r ...
... Look again at Table 2.1, “The value of the suppliers Relation, represented as a table”. While the names of each attribute appearing in the column headings might suggest the meaning of the columns, in the context of the hypothetical business using this relation, these data are intended to represent r ...
10- CHAPTER (5)
... The Object Query Language (OQL) provide declarative access to the object database using an SQL-like syntax. It does not provide explicit update operators, but leaves this to the operations defined on object types. As with SQL,OQL can be used as a standalone language and as a language embedded in ano ...
... The Object Query Language (OQL) provide declarative access to the object database using an SQL-like syntax. It does not provide explicit update operators, but leaves this to the operations defined on object types. As with SQL,OQL can be used as a standalone language and as a language embedded in ano ...
as select branch_name
... It is possible for tuples to have a null value, denoted by null, for some ...
... It is possible for tuples to have a null value, denoted by null, for some ...
Database Security:An Introduction
... →This gives the account the capability to modify tuples of R. →In SQL this privilege is further divided into UPDATE, DELETE, and INSERT privileges to apply the corresponding SQL command to R. →In addition, both the INSERT and UPDATE privileges can specify that only certain attributes can be updated ...
... →This gives the account the capability to modify tuples of R. →In SQL this privilege is further divided into UPDATE, DELETE, and INSERT privileges to apply the corresponding SQL command to R. →In addition, both the INSERT and UPDATE privileges can specify that only certain attributes can be updated ...
original - Kansas State University
... Embedded SQL The SQL standard defines embeddings of SQL in a variety of programming languages such as C, Java, and Cobol. A language to which SQL queries are embedded is referred to as a host language, and the SQL structures permitted in the host language comprise embedded SQL. The basic form ...
... Embedded SQL The SQL standard defines embeddings of SQL in a variety of programming languages such as C, Java, and Cobol. A language to which SQL queries are embedded is referred to as a host language, and the SQL structures permitted in the host language comprise embedded SQL. The basic form ...
Instructor`s Manual
... Figure 3-24 shows the column characteristics for WPC COMPUTER_ASSIGNMENT table. Using the column characteristics, use Access SQL to create the COMPUTER_ASSIGNMENT table and the associated constraints in the WPC.accdb database. Are there any table or relationship settings or characteristics that cann ...
... Figure 3-24 shows the column characteristics for WPC COMPUTER_ASSIGNMENT table. Using the column characteristics, use Access SQL to create the COMPUTER_ASSIGNMENT table and the associated constraints in the WPC.accdb database. Are there any table or relationship settings or characteristics that cann ...
Tutorial 8
... In the figure below, you see an illustration of a many-to-many relationship. Note that the Job table is used to join the Position table and the Student table. ...
... In the figure below, you see an illustration of a many-to-many relationship. Note that the Job table is used to join the Position table and the Student table. ...