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A query is a question or a request for information expressed in a formal manner. In computer science, a query is essentially the same thing, the only difference is the answer or retrieved information comes from a database. A database query is either an action query or a select query. A select query is one that retrieves data from a database. An action query asks for additional operations on data, such as insertion, updating, deleting or other forms of data manipulation.
Query languages are used to make queries in a database, and Microsoft Structured Query Language (SQL) is the standard. Note: SQL and MySQL are not the same, as the latter is a software extension that uses SQL. Other language extensions of the language include Oracle SQL and NuoDB. Although Microsoft's SQL is the most popular language, there are many other types of databases and languages. These include NoSQL databases and graph databases, Cassandra Query Language (CQL), Data Mining Extensions (DMX), Neo4j Cypher and XQuery.
If you’re unfamiliar with database queries, running a SQL query on your database may seem daunting. However, it isn’t as complicated as you might think.
To run a SQL query on your database, you’ll need: