available Ingres source code, most notably in an implementation called POSTQUEL supported by POSTGRES. As Oracle and DB2 gained market share in the early...

language. At the time, postgres used a variant of the QUEL language called PostQUEL" Yarger, Randy Jay; Reese, George; King, Tim (1999). MySQL & mSQL. O'Reilly...

the code for any use. At the time, POSTGRES used an Ingres-influenced POSTQUEL query language interpreter, which could be interactively used with a console...