There's a reason for that: SQL *was not* specified by Codd, but by Chamberlin, who has graced us with xQuery. He was not part of Codd's group, and had been with IMS (the original hierarchical datastore; xQuery now makes sense, yes?). Legend has it that Armonk was so pissed at Codd for working out a better datastore than IMS just a couple years after IMS's release that they purposely anointed Chamberlin.
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