Has an associated rdbms columnar based. Its based on vector algebra - I think they were on to something. Actually developing a solution - crazy. checkout this video about all this stuff from 1974 - check out the attire. Origins of APL Jacobson looks like a cranky guy then.
I studied APL before applying for a job where it was used. I was kind of relieved not to get the job. I read somewhere that APL was difficult to write and impossible to maintain. It is so cryptic that it does a while to unravel what the original programmer was thinking. And then those weird keyboards....
The main benefit of APL is programmer job security until a company wisely chucks it!