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D'fhorbair Edgar F. Codd na bunchoincheapa don Samhail Choibhneasta i saotharlann IBM agus d'fhoilsigh sé a smaointe i bpáipéar cáiliúil i Meitheamh 1970 in iris speisialta faoin teideal "A Relational Model of Data for Large Shared Data Banks". Úsáidtear Teanga Struchtúrtha Iarratas nó SQL (Structured Query Language as Béarla) don chuid is mó chun bunachair shonraí atá bunaithe ar an samhail choibhneasta a bhainistiú.
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