Even though it was more than 25 years ago, I still remember the first time I used (and misused) Query on the S/36 we had at the school district I worked for. The superintendent asked for a simple report containing employee name, job, pay table grade step, and salary. What could be easier? Days later, I produced the report after learning about “joins” and what several files without specified joins could do to a processor (an elephant falling to its knees is a good analogy). ...

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