Editing Query language (section)

{{Short description|Computer language used to make queries into databases and information systems}}
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A '''query language''', also known as '''data query language''' or '''database query language''' ('''DQL'''), is a [[computer language]] used to make queries in [[database]]s and [[information system]]s. In database systems, query languages rely on strict theory to retrieve information.<ref>{{Cite journal |last=Schmitt |first=Ingo |date=January 2008 |title=QQL: A DB&IR Query Language |url=https://link.springer.com/article/10.1007/s00778-007-0070-1 |journal=The VDLB Journal 17 |volume=17 |pages=39–56 |doi=10.1007/s00778-007-0070-1 |s2cid=207032530 |via=ACM Digital Library|url-access=subscription }}</ref> A well known example is the [[Structured Query Language]] (SQL).