After testing SQL at customer test sites to determine the usefulness and practicality of the system, IBM began developing commercial products based on their System R prototype including System/38, SQL/DS, and DB2, which were commercially available in 1979, 1981, and 1983, respectively.
Pärast SQL-i otstarbekus- ja kasutatavuskatseid hakkas IBM arendama kommertsvariante System/38, SQL/DS ja DB2, mis tulid välja vastavalt aastatel 1979, 1981 ja 1983.