SQL: Diferenzas entre revisións
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==Notas==
{{
<ref name="IBM-SQL">{{cita web | author = IBM Knowledge Center | title = SQL Guide | url = http://publib.boulder.ibm.com/infocenter/soliddb/v6r3/topic/com.ibm.swg.im.soliddb.sql.doc/doc/tables.rows.and.columns.html|website=Publib.boulder.ibm.com|accessdate=03/01/2018 }}</ref>
<ref name="MS-SQL-def">{{cita web| author =| title = Structured Query Language (SQL) | url = http://msdn.microsoft.com/en-gb/library/windows/desktop/ms714670(v=vs.85).aspx|website=Msdn.microsoft.com|accessdate=03/01/2018}}</ref>
<ref name="codd-relational-model">{{cita publicación periódica | last = Codd | first = Edgar F | title = A Relational Model of Data for Large Shared Data Banks | journal = Communications of the ACM | volume = 13 | issue = 6 | pages = 377–87 | publisher = Association for Computing Machinery | date = June 1970 | url = http://www.acm.org/classics/nov95/toc.html | accessdate = 03/01/2018| doi = 10.1145/362384.362685 }}</ref>
<ref name="
<ref name="ISO/IEC">{{cita web| url = https://www.iso.org/standard/63555.html | title = ISO/IEC 9075-1:2016: Information technology – Database languages – SQL – Part 1: Framework (SQL/Framework) | dataacceso = 03/01/2018 }}</ref>
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