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Structured Query Language, abbreviated as SQL,(/ˈsiːkwəl/ "sequel", /ˌɛsˌkjuːˈɛl/ S-Q-L; ) is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS). It is particularly useful in handling structured data, i.e. data incorporating relations among entities and variables.