A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Relational Database Management System, a widely used type of database management system characterised by its extensive use of joining as a core operational principle.
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Data Definition Language; defining database structures but not their contents.
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Entity Relationship Diagram
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The PIVOT syntax converts row data into columnar data, and vice versa for the UNPIVOT syntax. Not all databases support the PIVOT syntax but the functionality can be implemented, often using decision …
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the configuration file for MySQL server, client programs, and utilities.
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the practice of logically dividing or partitioning data, usually using a sprecific key (referred to as a shard key), and then placing that data on separate hosts (subsequently known as sha…
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a free tool for SQL & PL/SQL development and reporting similar to Quest's Toad or Allround Automations' PL/SQL Developer.
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MySQL Cluster : MySQL's Distributed Database
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a data infrastructure implementing a framework of geographic data, metadata, users and tools that are interactively connected in order to use spatial data in an …
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A set of zero, one or more attributes, the value(s) of which are guaranteed to be unique for each tuple (row) in a relation.
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Database auditing involves observing a database so as to be aware of the actions of database users.
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Constructing a query at runtime with string concatenation operations and executing the query from that string.
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'Extract, Transform and Load': Data load processing, normally in the context of data warehouse systems.
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A file with contents formatted as comma-separated values.
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store transient data.
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a Java standard that provides the interface for connecting from Java to relational databases.
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Defined like a view but holding persistent data like a table, Materialized Views are a feature of a number of RDBMSs including Oracle, DB2 and postgres. SQL Server has a similar feature called an Inde…
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For questions about Microsoft SQL Server Express (except Express LocalDB).
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the primary interactive terminal for PostgreSQL. (DO NOT USE THIS TAG for questions targeting PostgreSQL!)
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An acronym for Common Table Expression. They are temporary, reusable subqueries that may be recursive.
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Numerical sequence generation for automatic key creation
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About PostgreSQL performance optimization. It is essential to include sufficient information in your question as outlined in the tag info. For simple cases and beginners questions, please ask on http:…
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a function of many relational database management systems. The query optimizer attempts to find an efficient way to execute a given query by considering the possible query plans.
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provides the infrastructure for queue-based asynchronous message communication between databases.
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A database storage unit that groups related logical structures together.
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SQL Cursor : Database Object That Provisions Access to Records in a Database
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Microsoft SQL Server's command line utility that allows you execute T-SQL commands from a command prompt.
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The set of rules that define the combinations of symbols that are considered to be correctly structured for that language.
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PostgreSQL 9.4 : 2014 release of PostgreSQL
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