NonProcedural Language

NPL (for NonProcedural Language) was a declarative programming language for querying relational databases developed by T.D. Truitt et al. in 1980 for Apple II and, later, for MS-DOS.

Notes and references

  1. ↑ "An Introduction to Nonprocedural Languages Using NPL", T.D. Truitt et al., McGraw-Hill 1983.
  2. ↑ Truitt, T. D. "NPL: the nonprogrammer's data base language" Computer Language 4(06) June 1987 pp97-103