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2. File:PostgreSQL.pdf - Wikipedia

   en.wikipedia.org/wiki/File:PostgreSQL.pdf

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

3. PostgreSQL - Wikipedia

   en.wikipedia.org/wiki/PostgreSQL

   WAL-E is a backup and restore tool for PostgreSQL that provides support for physical (WAL-based) backups, written in Python. [111] DBeaver DBeaver is a free and open source GUI administration tool for PostgreSQL, it has Visual Entity Diagrams and Intellisense features. It also has a commercial PRO license.

4. Presto (SQL query engine) - Wikipedia

   en.wikipedia.org/wiki/Presto_(SQL_query_engine)

   Presto (including PrestoDB, and PrestoSQL which was re-branded to Trino) is a distributed query engine for big data using the SQL query language. Its architecture allows users to query data sources such as Hadoop, Cassandra, Kafka, AWS S3, Alluxio, MySQL, MongoDB and Teradata, [1] and allows use of multiple data sources within a query.

5. SQL - Wikipedia

   en.wikipedia.org/wiki/SQL

   SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...

6. Query language - Wikipedia

   en.wikipedia.org/wiki/Query_language

   A query language, also known as data query language or database query language (DQL), is a computer language used to make queries in databases and information systems. In database systems, query languages rely on strict theory to retrieve information. [1] A well known example is the Structured Query Language (SQL).

7. Query by Example - Wikipedia

   en.wikipedia.org/wiki/Query_by_Example

   Query by Example (QBE) is a database query language for relational databases. It was devised by Moshé M. Zloof at IBM Research during the mid-1970s, in parallel to the development of SQL . [ 1 ] It is the first graphical query language, using visual tables where the user would enter commands, example elements and conditions.

8. Relational algebra - Wikipedia

   en.wikipedia.org/wiki/Relational_algebra

   The relational algebra uses set union, set difference, and Cartesian product from set theory, and adds additional constraints to these operators to create new ones.. For set union and set difference, the two relations involved must be union-compatible—that is, the two relations must have the same set of attributes.

9. Select (SQL) - Wikipedia

   en.wikipedia.org/wiki/Select_(SQL)

   First Page: select only the first {rows} rows, depending on the type of database; Next Page: select only the first {rows} rows, depending on the type of database, where the {unique_key} is greater than {last_val} (the value of the {unique_key} of the last row in the current page)