提交 9c94a33f 编写于 作者: E Espartaco Palma

[es] Adding SQL books

上级 6fe384e0
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###SQL
* [El lenguaje SQL](http://ocw.uoc.edu/computer-science-technology-and-multimedia/bases-de-datos/bases-de-datos/P06_M2109_02149.pdf)
* [Manual de gestión de base de datos](http://www.jorgesanchez.net/bd/gbd2012.pdf)
* [Tutorial de SQL](http://www.desarrolloweb.com/manuales/9/)
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