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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PostgreSQL version 9.1
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A visual database design tool developed by MySQL. It is the successor application of the DBDesigner4 project.
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a Windows service installed with the SQL Server Standard Edition and above. It provides an automated way of executing or performing administrative task against a SQL Server instanc…
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GROUP BY : SQL Aggregation for Common Values
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Determining what database product best fits the requirements and limitations in a specific situation. This is advice that generally requires much more insight into requirements than can easily be gle…
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A situation caused by two or more processes being unable to proceed (and thus release their locks) because they are blocked by locks on resources held by the other process.
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A function performs some specified work, usually taking parameters as input. In terms of databases these may be specific to SQL or to the database vendor.
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A popular open-source embeddable (i.e. non client-server) RDBMS implemented as a C library.
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Writing queries to request or change information stored in a database or other information management system. Questions should include table and index definitions, sample data, expected output, and a …
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A declarative mechanism such as a check or foreign key that enforces some data integrity rule in a database.
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SQL Server 2000 (major build version 8.00.xxxx). Please also tag sql-server.
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generally and informally recognized as the methods and processes that have been shown over time to be superior to those achieved by other means.
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Specifies the type of data being stored (string, date, numeric, etc).
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MySQL version 5.1 - please also tag with mysql for search purposes.
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Improving the performance characteristics of a database application or system.
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A database system optimised for reporting, particularly in aggregate. Often, but not always implemented using a star schema.
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Combining multiple data points into a single data point. This usually is used in reference to SQL and usually to an aggregate function of some sort.
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For questions about database mirroring - a technology used to create and maintain an exact copy of a database, synchronously or asynchronously.
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Reconstructing a database.
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A catch-all term describing database systems using various non-relational models. Such systems are usually engineered to be high-performance.
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a desktop and server operating system based on Debian GNU/Linux. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.
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The automated distribution of transactional changes from a publishing database to one or more subscriber databases.
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A data structure that organizes information into rows and columns.
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Short for 'eXtensible Markup Language.' A textual markup language for transferring structured data.
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PostgreSQL version 9.2
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SQL Server Analysis Services, an OLAP server bundled with SQL Server by Microsoft since version 7.0
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In the database structured query language (SQL), the DELETE statement removes one or more records from a table.
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PostgreSQL performance optimization. Essential to include sufficient information in your question as outlined in the full tag wiki.
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Upgrade refers to the replacement of a product with a newer version of the same product. - replace (a software program) with a more recently released, enhanced version. - replace (a hardware devic…
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Oracle Database 12c. Please also tag oracle for search purposes.
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an open source tool written in PHP to handle administration of MySQL over the web. It can perform various tasks such as creating, modifying or deleting databases, tables, fields or rows;…
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A clause used in SQL SELECT statements to sort query results.
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Generic MySQL version 5 tag. Please use a mysql-5.x tag instead. Also tag with mysql for search purposes.
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used to count the number of rows.
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Percona : MySQL open source fork with performance improvements
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a relational database-as-a-service from Microsoft. This tag is for questions about Azure SQL Database, NOT SQL Server hosted in an Azure VM (use azure-vm).