Geodesic
Comparison of expressive power of some query languages for databases
Informatics and Automation, Algorithmic aspects of algebra and logic, Tome 274 (2011), pp. 297-313

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A version of the SQL language and a version of the stratified Datalog are considered, and it is proved that each of these languages can be translated into the other. 
@article{TRSPY_2011_274_a16,
     author = {M. A. Taitslin},
     title = {Comparison of expressive power of some query languages for databases},
     journal = {Informatics and Automation},
     pages = {297--313},
     publisher = {mathdoc},
     volume = {274},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2011_274_a16/}
}
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M. A. Taitslin. Comparison of expressive power of some query languages for databases. Informatics and Automation, Algorithmic aspects of algebra and logic, Tome 274 (2011), pp. 297-313. http://geodesic.mathdoc.fr/item/TRSPY_2011_274_a16/