A Database System for Time
... A date and time-of-day fractional Julian day value is simply called a timevalue for short. Such Julian day values are used internally, while ordinary dates and times age specfied as input and given as output. The time-value t associated with a given value x of a time-dependent database variable v is ...
... A date and time-of-day fractional Julian day value is simply called a timevalue for short. Such Julian day values are used internally, while ordinary dates and times age specfied as input and given as output. The time-value t associated with a given value x of a time-dependent database variable v is ...
Introduction to Structured Query Language Version 4.66 Copyright 1996-2001, James Hoffman
... disclaimer holds for the features of SQL that will be discussed below. This section is just to give you an idea of the possibilities of queries that can be written in SQL. ...
... disclaimer holds for the features of SQL that will be discussed below. This section is just to give you an idea of the possibilities of queries that can be written in SQL. ...
Description Logics and database
... a view. If a view is materialized, then its value is stored rather than recomputed on demand, and it is kept correct after every update to the basic database. The DBMS performs a number of hidden functions, insulating users from the considerable details of the physical level. For example, the DBMS p ...
... a view. If a view is materialized, then its value is stored rather than recomputed on demand, and it is kept correct after every update to the basic database. The DBMS performs a number of hidden functions, insulating users from the considerable details of the physical level. For example, the DBMS p ...
Precision Considerations for Analysis Services Users
... The reason for the inconsistency in this environment has to do with the caching mechanism that Analysis Services provides in concert with floating point representation. If it detects a query in which the subcube (in the test scenario, [All Geographies, X]) is already placed into its cache, Analysis ...
... The reason for the inconsistency in this environment has to do with the caching mechanism that Analysis Services provides in concert with floating point representation. If it detects a query in which the subcube (in the test scenario, [All Geographies, X]) is already placed into its cache, Analysis ...
A Survey on Query Processing and Optimization
... A select-project-join query, an optimizer has to make many choices, the most important being: access methods, join order, join algorithms, and pipeling. [2] Access Method: The optimizer needs to pick an access method for each table in the query. Typically there are many choices, including a direct t ...
... A select-project-join query, an optimizer has to make many choices, the most important being: access methods, join order, join algorithms, and pipeling. [2] Access Method: The optimizer needs to pick an access method for each table in the query. Typically there are many choices, including a direct t ...
original - Kansas State University
... check in practice unless they pertain to only one relation If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency preserving. Because it is not always possi ...
... check in practice unless they pertain to only one relation If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency preserving. Because it is not always possi ...
Open Source Database Systems
... • Relational Databases (RDB) are the most common type of databases, they depend on on a sound theoretical basis in relational algebra. • However, we don’t need to understand relational theory to use them. • However, some basic concepts need to be understood ...
... • Relational Databases (RDB) are the most common type of databases, they depend on on a sound theoretical basis in relational algebra. • However, we don’t need to understand relational theory to use them. • However, some basic concepts need to be understood ...
CS 579 Database Systems
... If a value for a hiredate is in Emps, then the same value for startdate MUST be in Projs: Employees could only be hired on the day some project started! ...
... If a value for a hiredate is in Emps, then the same value for startdate MUST be in Projs: Employees could only be hired on the day some project started! ...
Advanced Database Techniques 2009
... INSERT INTO TMP SELECT * FROM TENKTUP1, BPRIME WHERE (TENKTUP1.unique1 = BPRIME.unique1) Query 17 (non-clustered index) - JoinCselAselB INSERT INTO TMP SELECT * FROM ONEKTUP, TENKTUP1 WHERE (ONEKTUP.unique1 = TENKTUP1.unique1) AND (TENKTUP1.unique1 = TENKTUP2.unique1) AND (TENKTUP1.unique1 < 1000) ...
... INSERT INTO TMP SELECT * FROM TENKTUP1, BPRIME WHERE (TENKTUP1.unique1 = BPRIME.unique1) Query 17 (non-clustered index) - JoinCselAselB INSERT INTO TMP SELECT * FROM ONEKTUP, TENKTUP1 WHERE (ONEKTUP.unique1 = TENKTUP1.unique1) AND (TENKTUP1.unique1 = TENKTUP2.unique1) AND (TENKTUP1.unique1 < 1000) ...
Mining Patterns in Relational Databases
... Age’. Data mining, also referred to as knowledge discovery from data (KDD), is ‘the automated or convenient extraction of patterns representing knowledge implicitly stored or captured in large databases, data warehouses, the Web, other massive information repositories, or data streams’ [Han & Kamber ...
... Age’. Data mining, also referred to as knowledge discovery from data (KDD), is ‘the automated or convenient extraction of patterns representing knowledge implicitly stored or captured in large databases, data warehouses, the Web, other massive information repositories, or data streams’ [Han & Kamber ...
Kentico CMS Performance Optimization
... – Off the shelf: caching, indexing, queries – Newsmax: more caching and cache management, more indexing and stats and query tuning. – UPGRADE TO 5.5 (V.V. imp.) – Understand Kentico CMS is a normal ASP.NET web project. Many ...
... – Off the shelf: caching, indexing, queries – Newsmax: more caching and cache management, more indexing and stats and query tuning. – UPGRADE TO 5.5 (V.V. imp.) – Understand Kentico CMS is a normal ASP.NET web project. Many ...
lecture 15
... your miniworld. A recursive 1:1 relationship allows two entities of the same entity set to be related, but a given entity can only be related to one other entity. Consider the following figure, where we illustrate 5 persons, and the relationship set showing two marriages involving two people each. T ...
... your miniworld. A recursive 1:1 relationship allows two entities of the same entity set to be related, but a given entity can only be related to one other entity. Consider the following figure, where we illustrate 5 persons, and the relationship set showing two marriages involving two people each. T ...
Intro2SQL-2
... Each table’s rows need to be unique, i.e. needs to have a unique primary key. One method to achieve this is to give each row a row_id or numeric index. This index is auto-incremented every time a new row is inserted in the table. ...
... Each table’s rows need to be unique, i.e. needs to have a unique primary key. One method to achieve this is to give each row a row_id or numeric index. This index is auto-incremented every time a new row is inserted in the table. ...
SQL- and Operator-centric Data Analytics in Relational Main
... calls to library functions, or the SQL language is extended with data analytics functions. MADlib [17] is an example for the second level of our classification, user-defined functions. This library works on top of selected databases and heavily uses data parallel query execution if provided by the u ...
... calls to library functions, or the SQL language is extended with data analytics functions. MADlib [17] is an example for the second level of our classification, user-defined functions. This library works on top of selected databases and heavily uses data parallel query execution if provided by the u ...
JDBC and Sql
... they have been formed having is usually used in conjunction with an aggregate function ...
... they have been formed having is usually used in conjunction with an aggregate function ...
Open Source Database Systmes
... • Relational Databases (RDB) are the most common type of databases, they depend on on a sound theoretical basis in relational algebra. • However, we don’t need to understand relational theory to use them. • However, some basic concepts need to be understood ...
... • Relational Databases (RDB) are the most common type of databases, they depend on on a sound theoretical basis in relational algebra. • However, we don’t need to understand relational theory to use them. • However, some basic concepts need to be understood ...
Elmasri_6e_Ch24
... 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 by ...
... 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 by ...
grant
... • File systems identify certain access privileges on files, e.g., read, write, execute. • Similarly, SQL identifies six access privileges on relations, of which the most important are: 1. SELECT = the right to query the relation. (READ) 2. INSERT = the right to insert tuples into the relation – may ...
... • File systems identify certain access privileges on files, e.g., read, write, execute. • Similarly, SQL identifies six access privileges on relations, of which the most important are: 1. SELECT = the right to query the relation. (READ) 2. INSERT = the right to insert tuples into the relation – may ...
What is a Database Management System?
... Arthur M. Keller Email: [email protected] (best way to reach me) Office: Baskin Engineering 153a, (831) 459-1485 Office Hours: Tuesdays 4:30–5:30pm and by ...
... Arthur M. Keller Email: [email protected] (best way to reach me) Office: Baskin Engineering 153a, (831) 459-1485 Office Hours: Tuesdays 4:30–5:30pm and by ...
SAS and Relational Databases: What You Must Know
... The structure of the data you would query will probably be drastically different as well. It’s not uncommon for datasets to have the information you need in just one or two sources. This is unlikely with an RBMS – you will probably have to connect many tables to get the same information. For example ...
... The structure of the data you would query will probably be drastically different as well. It’s not uncommon for datasets to have the information you need in just one or two sources. This is unlikely with an RBMS – you will probably have to connect many tables to get the same information. For example ...
SQL, NoSQL, MongoDB
... • Find things within tables by brute force or indexes, e.g. B-Trees or Hash Tables • Cross-reference tables via shared keys, basically an optimized cross-product, known as a “join” • Expensive operation ...
... • Find things within tables by brute force or indexes, e.g. B-Trees or Hash Tables • Cross-reference tables via shared keys, basically an optimized cross-product, known as a “join” • Expensive operation ...