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PowerPoint Presentation - Title slide
PowerPoint Presentation - Title slide

... There are different types of fields, field types include: A text fields that contain text A numeric fields which contain only numbers and date fields which contain only dates Other field types can include other types of data including graphics, photos, sounds or even videos Computed fields contain f ...
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Rule 3: Systematic Treatment of NULL values
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...  PL/SQL provides access to predefined SQL packages.  PL/SQL provides support for Developing Web Applications and Server Pages.  PL/SQL provides a built-in interpreted and OS independent programming environment.  PL/SQL can also directly be called from the command-line SQL*Plus interface.  Direc ...
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... DATABASE MANAGEMENT SYSTEM: A collection of programs to create and maintain a ...
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Split UP IP - Kendriya Vidyalaya No. 1, Dehu Road, Pune
Split UP IP - Kendriya Vidyalaya No. 1, Dehu Road, Pune

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... sites (TFBS). Analysis of regulatory effects is challenging as combinations of diverse TFBS and DNA accessibility have to be considered. We developed D-Light, a new software offering storage and management of DNApromoter sequences, annotation data and PFMs for multiple genomes. All data are stored i ...
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eXtremeDB® In-Memory Database System
eXtremeDB® In-Memory Database System

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Relational model



The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.
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