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SQLAlchemy offers tools for database schema generation, querying, and object-relational mapping. Key features include: A comprehensive embedded domain-specific language for SQL in Python called "SQLAlchemy Core" that provides means to construct and execute SQL queries. A powerful ORM that allows the mapping of Python classes to database tables.
The following programs in particular can be used to decompress bzip2, .bz2, .zip, and .7z files. Windows. Beginning with Windows XP, a basic decompression program enables decompression of zip files. [2] [3] Among others, the following can be used to decompress bzip2 files. bzip2 (command-line) (from here) is available for free under a BSD license.
Storm is a Python programming library for object-relational mapping between one or more SQL databases and Python objects. It allows Python developers to formulate complex queries spanning multiple database tables to support dynamic storage and retrieval of object information.
The primary front-end for PostgreSQL is the psql command-line program, which can be used to enter SQL queries directly, or execute them from a file. In addition, psql provides a number of meta-commands and various shell-like features to facilitate writing scripts and automating a wide variety of tasks; for example tab completion of object names ...
There are graphical and command line utilities in Windows, Linux, and Mac OS X environments. Zen Control Center (CC) is the main utility that enables the user to create and manipulate databases and tables, to access servers and clients, to set configurations and properties, and to edit data. Through CC, the user can access a series of other ...
The name "Postgres-XL" stands for "eXtensible Lattice". [2] The last release of Postgres-XL was made in September 2018 and development ceased in October. [3] The website has also gone offline. Postgres-XL is based on Postgres-XC, an earlier distributed PostgreSQL system developed by NTT Data and EnterpriseDB. [4]
The logical schema was the way data were represented to conform to the constraints of a particular approach to database management. At that time the choices were hierarchical and network. Describing the logical schema, however, still did not describe how physically data would be stored on disk drives. That is the domain of the physical schema.
The database schema is the structure of a database described in a formal language supported typically by a relational database management system (RDBMS). The term " schema " refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases ).