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===Orthogonality and completeness=== Early specifications did not support major features, such as primary keys. Result sets could not be named, and subqueries had not been defined. These were added in 1992.<ref name="Early History" /> The lack of [[sum type]]s has been described as a roadblock to full use of SQL's user-defined types. JSON support, for example, needed to be added by a new standard in 2016.<ref name="Brandon21">{{cite web |last1=Brandon |first1=Jamie |title=Against SQL |url=https://scattered-thoughts.net/writing/against-sql/ |access-date=2 August 2021 |language=en |date=July 2021}}</ref>
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