document
... WHERE "simple condition" {[AND|OR] "simple condition"}+ SELECT store_name FROM Store_Information WHERE Sales > 1000 OR (Sales < 500 AND Sales > 275) ...
... WHERE "simple condition" {[AND|OR] "simple condition"}+ SELECT store_name FROM Store_Information WHERE Sales > 1000 OR (Sales < 500 AND Sales > 275) ...
Computing Pareto Frontiers and Database
... They have to be followed by an expression which evaluates to a numerical value. An expression which evaluates to a logical value is called a Boolean preference. In the induced order all tuples evaluating to TRUE are better than the FALSE ones. These base constructs can be combined to obtain more com ...
... They have to be followed by an expression which evaluates to a numerical value. An expression which evaluates to a logical value is called a Boolean preference. In the induced order all tuples evaluating to TRUE are better than the FALSE ones. These base constructs can be combined to obtain more com ...
Lecture slide
... – Value of an attribute is drawn from the attribute’s domain • There is also a special value null (value unknown or undefined), which belongs to no domain ...
... – Value of an attribute is drawn from the attribute’s domain • There is also a special value null (value unknown or undefined), which belongs to no domain ...
Chapter 10
... name fields. • Notice that every entry in Cities.country appears uniquely in Countries.name and Countries.name is a primary key. • We say that Cities.country is a foreign key of Countries.name. ...
... name fields. • Notice that every entry in Cities.country appears uniquely in Countries.name and Countries.name is a primary key. • We say that Cities.country is a foreign key of Countries.name. ...
Document
... Example: {customer_name} is a candidate key for Customer, since it is a superkey (assuming no two customers can possibly have the same name), and no subset of it is a superkey. Primary Key ...
... Example: {customer_name} is a candidate key for Customer, since it is a superkey (assuming no two customers can possibly have the same name), and no subset of it is a superkey. Primary Key ...
Expressive Power of an Algebra For Data Mining
... clusterings [Hand et al. 2001]. Subsequently, researchers realized the importance of setting mining in the larger context of knowledge discovery from databases (KDD) involving other components. One key component is how to integrate mining with the underlying database systems [Sarawagi et al. 1998; N ...
... clusterings [Hand et al. 2001]. Subsequently, researchers realized the importance of setting mining in the larger context of knowledge discovery from databases (KDD) involving other components. One key component is how to integrate mining with the underlying database systems [Sarawagi et al. 1998; N ...
MAYUR Relational Database Management System Model Answer
... “Multivalued Fact” about another and the attribute must be independent of each other’s. If there are three attributes involved in a relation A, B & C. Then for every value A will have respective value for B and C. But it is necessary that both B and C values are independent of others. Multivalued de ...
... “Multivalued Fact” about another and the attribute must be independent of each other’s. If there are three attributes involved in a relation A, B & C. Then for every value A will have respective value for B and C. But it is necessary that both B and C values are independent of others. Multivalued de ...
Chapter 6: Integrity Constraints
... • An assertion is a predicate expressing a condition that we wish the database always to satisfy. • An assertion in SQL-92 takes the form create assertion check
• When an assertion is made, the system tests it for validity. This
testing may introduce a significant amount ...
... • An assertion is a predicate expressing a condition that we wish the database always to satisfy. • An assertion in SQL-92 takes the form create assertion
Chapter 8
... Rule 8: Stable columns with few values are good candidates for bitmap indexes if the columns appear in WHERE conditions. Rule 9: Avoid indexes on combinations of columns. Most optimization components can use multiple indexes on the same table. ...
... Rule 8: Stable columns with few values are good candidates for bitmap indexes if the columns appear in WHERE conditions. Rule 9: Avoid indexes on combinations of columns. Most optimization components can use multiple indexes on the same table. ...
Database management
... Language (SQL) standard was published SQL is an English-like language Uses words like SELECT, INSERT, DELETE, UPDATE and GRANT to pass instructions to the DBMS ...
... Language (SQL) standard was published SQL is an English-like language Uses words like SELECT, INSERT, DELETE, UPDATE and GRANT to pass instructions to the DBMS ...
Database Design: DBS CB, 2nd Edition
... Solution: Periodic reconstruction of the materialized view, which is otherwise “out of date.” ...
... Solution: Periodic reconstruction of the materialized view, which is otherwise “out of date.” ...
Insert Title Here
... • Attribute does not apply to this tuple • Attribute value is unkown • Value is known but absent (not yet recorded) – Causes problems with queries (can’t interpret query answers) ...
... • Attribute does not apply to this tuple • Attribute value is unkown • Value is known but absent (not yet recorded) – Causes problems with queries (can’t interpret query answers) ...
slides
... The subset of R2 is a foreign key referencing K1 in relation r1, if for every t2 in r2 there must be a tuple t1 in r1 such that t1[K1] = t2[]. Referential integrity constraint also called subset dependency since its ...
... The subset of R2 is a foreign key referencing K1 in relation r1, if for every t2 in r2 there must be a tuple t1 in r1 such that t1[K1] = t2[]. Referential integrity constraint also called subset dependency since its ...
SlimShot: In-Database Probabilistic Inference for Knowledge
... start-up companies like Tamr and Trifacta) and to several research prototypes like DeepDive [36], Tuffy [28], ProbKB [8], SystemT [27], and DBLife [35]. As explained in [36], a KBC engine performs two major tasks. The first is grounding, which evaluates a large number of SQL queries to produce a lar ...
... start-up companies like Tamr and Trifacta) and to several research prototypes like DeepDive [36], Tuffy [28], ProbKB [8], SystemT [27], and DBLife [35]. As explained in [36], a KBC engine performs two major tasks. The first is grounding, which evaluates a large number of SQL queries to produce a lar ...
Document
... containing the above join dependency. To put Loan-info-schema into PJNF, we must decompose it into the three schemas specified by the join dependency: ...
... containing the above join dependency. To put Loan-info-schema into PJNF, we must decompose it into the three schemas specified by the join dependency: ...
Queries and Data Models for Prediction and Measurement In Remos
... Describes entities, structure, relationships e.g., relations, tuples, attributes, domains ...
... Describes entities, structure, relationships e.g., relations, tuples, attributes, domains ...
ppt file - NUS School of Computing
... based on XTree and has deductive and objectoriented features. The relationship between XDO2 and XQuery is similar to the relationship between Datalog and SQL XDO2 queries are simpler and more compact than current XML query languages such as XQuery because XDO2 is based on XTree, and supports (recurs ...
... based on XTree and has deductive and objectoriented features. The relationship between XDO2 and XQuery is similar to the relationship between Datalog and SQL XDO2 queries are simpler and more compact than current XML query languages such as XQuery because XDO2 is based on XTree, and supports (recurs ...
SDLC Tute - Information Management and Systems
... MySQL are identical to that used by other relational DBMS programs such as Oracle, SQL Server and DB2 to name a few. In some cases, the commands and syntax used in MySQL may differ slightly from those used by other DBMS products but this is not uncommon in proprietary products. The version of MySQL ...
... MySQL are identical to that used by other relational DBMS programs such as Oracle, SQL Server and DB2 to name a few. In some cases, the commands and syntax used in MySQL may differ slightly from those used by other DBMS products but this is not uncommon in proprietary products. The version of MySQL ...