Logic and Databases
... • Logic provides both a unifying framework and a set of tools for formalizing and studying data management tasks. • The interaction between logic and databases is a prime example of – Logic in Computer Science but also – Logic from Computer Science ...
... • Logic provides both a unifying framework and a set of tools for formalizing and studying data management tasks. • The interaction between logic and databases is a prime example of – Logic in Computer Science but also – Logic from Computer Science ...
www.ipeirotis.com
... Problem 1: Random sampling may retrieve non-representative documents Solution: Focus querying on “topically dense” areas of the database Problem 2: Frequencies are “compressed” to the sample size range Solution: Exploit number of matches for query and adjust estimates using curve fitting Problem 3: ...
... Problem 1: Random sampling may retrieve non-representative documents Solution: Focus querying on “topically dense” areas of the database Problem 2: Frequencies are “compressed” to the sample size range Solution: Exploit number of matches for query and adjust estimates using curve fitting Problem 3: ...
Chapter 5: Other Relational Languages
... Null Values It is possible for tuples to have a null value (denoted by null) for some of their ...
... Null Values It is possible for tuples to have a null value (denoted by null) for some of their ...
PPT - Electrical and Computer Engineering Department
... Null Values It is possible for tuples to have a null value, denoted by null, for some ...
... Null Values It is possible for tuples to have a null value, denoted by null, for some ...
ON SECOND THOUGHT: LOW-EFFORT THOUGHT PROMOTES
... of dual-processes models. I simply investigate whether values operate in a pattern consistent with automatic and controlled processing. Dual-process accounts of attitudes may help explain variations in values under different levels of thought processing since values are abstract standards that under ...
... of dual-processes models. I simply investigate whether values operate in a pattern consistent with automatic and controlled processing. Dual-process accounts of attitudes may help explain variations in values under different levels of thought processing since values are abstract standards that under ...
Chapter 1
... an overarching multitenant container database. A multitenant container database (CDB) is defined as a database capable of housing one or more pluggable databases. A container is defined as a collection of data files and metadata that exist within a CDB. A pluggable database is a special type of cont ...
... an overarching multitenant container database. A multitenant container database (CDB) is defined as a database capable of housing one or more pluggable databases. A container is defined as a collection of data files and metadata that exist within a CDB. A pluggable database is a special type of cont ...
Formal Relational Query Languages
... Null Values It is possible for tuples to have a null value, denoted by null, for some ...
... Null Values It is possible for tuples to have a null value, denoted by null, for some ...
Monitoring Secrets for SAP
... Every instance has a number between 00 and 99, the socalled instance number (abbreviated by InstNr or NN to indicate the numerical value). The installation default is 00. If more than one instance is installed on the same host, they MUST have different InstNr. InstNrs are usually part of the Port nu ...
... Every instance has a number between 00 and 99, the socalled instance number (abbreviated by InstNr or NN to indicate the numerical value). The installation default is 00. If more than one instance is installed on the same host, they MUST have different InstNr. InstNrs are usually part of the Port nu ...
Computing Consistent Query Answers using Conflict
... The main contributions of this paper are as follows: • A complete, scalable framework for computing consistent answers to projection-free relational algebra queries in the presence of denial constraints. Our approach uses a relational DBMS as a backend and scales up to large databases. • Novel optim ...
... The main contributions of this paper are as follows: • A complete, scalable framework for computing consistent answers to projection-free relational algebra queries in the presence of denial constraints. Our approach uses a relational DBMS as a backend and scales up to large databases. • Novel optim ...
Document
... Database A database consists of multiple relations Information about an enterprise is broken up into parts, with each ...
... Database A database consists of multiple relations Information about an enterprise is broken up into parts, with each ...
An approach to the model-based fragmentation and
... the file system, which is straightforward but does not support querying XML data, object-oriented database systems as well as systems based on semi-structured data models or native XML systems volunteer. However, comparative studies [4, 6, 7, 8] indicate, that relational or object-relational databas ...
... the file system, which is straightforward but does not support querying XML data, object-oriented database systems as well as systems based on semi-structured data models or native XML systems volunteer. However, comparative studies [4, 6, 7, 8] indicate, that relational or object-relational databas ...
Database Repairing and Consistent Query Answering Database
... Integrity constraints are semantic conditions that a database should satisfy in order to be an appropriate model of external reality. In practice, and for many reasons, a database may not satisfy those integrity constraints, and for that reason it is said to be inconsistent. However, and most likely ...
... Integrity constraints are semantic conditions that a database should satisfy in order to be an appropriate model of external reality. In practice, and for many reasons, a database may not satisfy those integrity constraints, and for that reason it is said to be inconsistent. However, and most likely ...
School of Geosciences Thesis template
... Figure 4.1. The relationship between the CMI and relevant social groups ............................. 47 Figure 4.2. Variation of meaning across social groups............................................................ 48 Figure 4.3. Variation of meaning for a single social group ................... ...
... Figure 4.1. The relationship between the CMI and relevant social groups ............................. 47 Figure 4.2. Variation of meaning across social groups............................................................ 48 Figure 4.3. Variation of meaning for a single social group ................... ...
Document
... – On receipt of PREPARE message from cohort, mark cohort as PREPARED. If all cohorts PREPARED, then change status to COMMITTED and send COMMIT message. must force a commit log record to disk before sending commit message. – on receipt of ACK message from cohort, mark cohort as ACKED. When all coho ...
... – On receipt of PREPARE message from cohort, mark cohort as PREPARED. If all cohorts PREPARED, then change status to COMMITTED and send COMMIT message. must force a commit log record to disk before sending commit message. – on receipt of ACK message from cohort, mark cohort as ACKED. When all coho ...
Automated Ranking of Database Query Results
... latter specified as a set of keywords), the problem is to retrieve the Top-K documents most relevant, or most similar to the query. Similarity between a document and the query is formalized as follows. Given a vocabulary of m words, a document is treated as an m-dimensional vector, where the ith com ...
... latter specified as a set of keywords), the problem is to retrieve the Top-K documents most relevant, or most similar to the query. Similarity between a document and the query is formalized as follows. Given a vocabulary of m words, a document is treated as an m-dimensional vector, where the ith com ...
Query-by-Example (QBE)
... Query By Example (GQBE) GQBE differs from QBE in the following ways ...
... Query By Example (GQBE) GQBE differs from QBE in the following ways ...
Introduction to SQL
... some of their attributes null signifies an unknown value or that a value does not exist. The result of any arithmetic expression involving null is null ...
... some of their attributes null signifies an unknown value or that a value does not exist. The result of any arithmetic expression involving null is null ...
Chapter 14: Query Optimization
... If only left-deep trees are considered, time complexity of finding best join order is O(n 2n) Space complexity remains at O(2n) Cost-based optimization is expensive, but worthwhile for queries on large datasets (typical queries have small n, generally < 10) ...
... If only left-deep trees are considered, time complexity of finding best join order is O(n 2n) Space complexity remains at O(2n) Cost-based optimization is expensive, but worthwhile for queries on large datasets (typical queries have small n, generally < 10) ...