{{Short description|Relational database language developed by T.D. Truitt et al}}
'''NPL''' (for '''NonProcedural Language''') was a [[relational database]] language developed by T.D. Truitt et al.<ref name="Truitt83">"An Introduction to Nonprocedural Languages Using NPL", T.D. Truitt et al., McGraw-Hill 1983.''</ref><ref name="Truitt87">Truitt, T. D. "NPL: the nonprogrammer's data base language" Computer Language 4(06) June 1987 pp97-103</ref> in 1980 for [[Apple II]] and, later, for [[MS-DOS]]. In general, a non-procedural language (also called a [[Declarative programming|declarative]] language) requires the programmer to specify ''what'' the program should do, rather than (as with a [[procedural language]]) providing the sequential steps indicating ''how'' the program should perform its task(s).
Modern languages such as Visual Basic or Java are called non-procedural or event-driven, languages because instead of writing a series of sequential instructions, a programmer defines the actions that the program must perform when certain events occur.
==Notes and references==
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[[Category:Query languages]]
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The artificial intelligence languages, so called in the old days, such as LISP and PROLOG, are also considered to be non-procedural although the case for LISP a bit murky since the pure LISP is supposed to be a functional language. this is the wrong definition truly
