Donald Chamberlin & Raymond Boyce Develop SEQUEL (SQL)

In 1974 Donald D. Chamberlin and Raymond F. Boyce of IBM Research Laboratory, San Jose, California, developed a Structured English Query Language (“SEQUEL”) to apply Edgar F. Codd’s model of relational databases. SEQUEL later became SQL, presumably because trademark conflicts caused IBM to switch from the original name.

Chamberlin & Boyce, "SEQUEL: A structured English query language," SIGFIDET '74: Proceedings of the 1974 ACM SIGFIDET (now SIGMOD) workshop on Data description, access and control, May 1974, 249–264. In September 2020 this paper was available from researcher.ibm.watson.com at this link.