... and more. I've seen these recurring questions asking about various facets of the pandas merge functionality. Most of the information regarding merge and its various use cases today is fragmented across dozens of badly worded, unsearchable posts. The aim here is to collate some of the more important points...
I'm refactoring some sql at work, and stumbled on something I'm not sure how to explain. There are two queries I thought would result in the same result, but don't, and I'm not sure why.
I have two dataFrames :And I would like to create a final DataFrame which looks like :I tried something with pivot, but it doesn't seem to do the job Could you help me ?
I have 2 data.tables:The result I expect is the following: joining label from dt2 to dt1 by the fact that value1 in dt1 is between valueMin and valueMax in dt2 and dt2$name matches to value1). Here is a solution I have (gives correct result):