Relational data model

Ebook Fundamentals of database management systems (Second edition): Part 1 presents the following content: Chapter 1 data: the new corporate resource; chapter 2 data modeling; chapter 3 the database management system concept; chapter 4 relational data retrieval: SQL; chapter 5 the relational database model: introduction; chapter 6 the relational database model: additional concepts. Please refer to the documentation for more details.

176p runthenight03 07-12-2022 8 2   Download

This study aimed to explore HRQoL and mental health of pilots and analyze the health characteristics and influencing factors, such as demographic data, personality traits, social support, and resilience. It may provide data for a theoretical basis for aviation security work and health management strategy.

10p viferrari 28-11-2022 5 1   Download

Experiment data on isolated rat hearts shows that the transient behaviors after switching pacing intervals are very complicated with increasing, decreasing, and rebound of the contraction force. The strength of contraction in the heart muscle is strongly related to intracellular free Ca2+ mediated by an action potential. This behavior can be explained by calcium cycling inside the excitable cardiac myocytes coupled with their action potential.

8p vispyker 14-11-2022 8 1   Download

N6 -methyladenosine (m6 A) mRNA modification triggers malignant behaviors of tumor cells and thereby drives malignant progression in gastric cancer (GC). However, data regarding the prognostic values of m6 A RNA methylation-related long non-coding RNAs (lncRNAs) in GC are very limited in the literature.

11p viangelamerkel 27-07-2022 2 1   Download

This book "Database System Concepts (Sixth edition)" present the fundamental concepts of database management. These concepts include aspects of database design, database languages, and database-system implementation. Part 1 of book provide students with knowledge about: database-system applications; relational databases; structure of relational databases; introduction to SQL; intermediate SQL; advanced SQL; formal relational query languages; database design; database design and the E-R model; relational database design; data storage and querying;...

651p britaikridanik 05-07-2022 10 1   Download

Distributed Database Management Systems: Lecture 5. The main topics covered in this chapter include: data model; legacy data models; a set of tools/constructs used to model a database; record/semantic; relational data model; primary key;...

26p haoasakura 30-05-2022 8 1   Download

Lecture Database Systems - Chapter 4: Relational data model and ER/EER-to-Relational mapping has present the content: relational data model; relational integrity constraints; main phases of database design; ER-/EER-to-Relational mapping;...

84p andromedashun 26-05-2022 5 1   Download

Lecture Database Systems - Chapter 4: Relational data model and ER-/EER-to-Relational mapping has present the contents relational data model; relational integrity constraints; update operations on relations; alternative terminology for relational model; relational database schema; main phases of database design;...

76p andromedashun 26-05-2022 10 1   Download

Lecture Database management systems: Lesson 14. The main topics covered in this chapter include: logical database design, introduction to relational data model, strong mathematical foundation, relational data model, mathematical relations, database relations,...

24p wangziyi_1307 26-04-2022 7 1   Download

This study uses a gravity model approach to assess the impact of LPI and its components on export among ASEAN members. The data used in the study were collected from ASEAN countries for several years in which the LPI was calculated for the period 2010-2018. The estimation results of the extended gravity model from the PPML method show that LPI and its components have positive impacts on intra-ASEAN export.

17p vistephenhawking 26-04-2022 7 1   Download

In 2021, the upgraded scenarios of climate change using Coupled Model Intercomparison Project 6 global climate models are released by Intergovernmental Panel on Climate Change. This information is a very important data source for scientists to continuously upgrade their studies in the behaviors of a natural system as extreme climate events are frequently observed.

7p viedison 13-04-2022 7 1   Download

The automated collection of non-specific data from livestock, combined with techniques for data mining and time series analyses, facilitates the development of animal health syndromic surveillance (AHSyS). An example of AHSyS approach relates to the monitoring of bovine fallen stock.

13p vigalileogalilei 28-02-2022 9 1   Download

The three-dimensional (3D) organization of chromosomes can be probed using methods like Capture-C. However, it is unclear how such population-level data relate to the organization within a single cell, and the mechanisms leading to the observed interactions are still largely obscure. We present a polymer modeling scheme based on the assumption that chromosome architecture is maintained by protein bridges, which form chromatin loops.

16p viaristotle 29-01-2022 10 1   Download

Based on the input gene sets, Lisa first uses histone mark ChIP-seq and chromatin accessibility profiles to construct a chromatin model related to the regulation of these genes. Using TR ChIP-seq peaks or imputed TR binding sites, Lisa probes the chromatin models using in silico deletion to find the most relevant TRs.

14p viarchimedes 26-01-2022 2 0   Download

The output data from the CERES-Wheat model showed that Gemmeiza-9 cultivar recorded the highest observed grain yield in the 1st and 2nd seasons (5352 and 5928 kg ha1 , respectively) and highest predicted grain yield (3957 and 4619 kg ha1 , respectively) in mediate sowing date (mid-November) as compared to other wheat cultivars Misr-1, Sakha-93 and Giza-168.

10p schindler 30-12-2021 8 0   Download

Order Diptera is the most important group of animals when it comes to insect immunity research. The largest share of experimental data in the group falls on the genus Drosophila - a model species with a number of advantages. Other crucial representatives are those of the mosquito group, as they are vectors of a number of infectious diseases infecting higher vertebrates and humans. As representatives of the genera, Anopheles, Aedes and Culex are very significant model organisms. In total, more than 40 dipteran species are being actively studied as models in various aspects related to immunity.

9p dolomite36 30-12-2021 5 0   Download

This sentence-level identification information is used by a teacher network to guide the baseline model’s training by sharing its classifier. Like an instructor, the classifier improves the baseline model’s ability to extract this sentence-level identification information from raw texts, thus benefiting overall performance.

17p guernsey 28-12-2021 4 0   Download

The proposed model is related to the electrical conductivity of the pore fluid, the specific electrical conductance and the microstructural parameters of a porous medium. The model predictions are successfully compared with published experimental data as well as another model available in literature. The model opens up new possibilities for prediction of the electrical conductivity of porous materials.

9p meyerowitz 25-12-2021 13 0   Download

In this paper, we propose a way by which we can store hypergraphs model in the SAP HANA in-memory database system which has a \Graph Core" engine besides the relational data model. Graph Core has many graph algorithms by default however it is not capable to store or to work with hypergraphs neither are any of these algorithms speci¯cally tailored for hypergraphs either.

21p redemption 20-12-2021 18 0   Download

In terms of performance, it may be bene¯cial to use a polyglot persistence, a multimodel approach or multilevel modeling, or even to transform the SQL database schema into NoSQL and to perform data migration between the relational and NoSQL databases.

17p redemption 20-12-2021 8 0   Download