在R中按条件联接表

我想按条件加入两个表

Data_1 <- data.frame(Section_A = c("a","a","a","a","a","b","b","b","b","b","b","c","c","c","c"), 
                     ID1 = c(1,2,3,4,5,10,11,12,13,14,15,20,21,22,23), 
                     Key = c("A","A","A","B","B","C","C","C","A","B","B","A","B","C","C"))

Data_2 <- data.frame(Section_B = c("d","d","d","d","d","d","e","e","e","f","f","f","f","f","f"), 
                     ID2 = c(31,32,33,34,35,36,41,42,43,54,55,56,57,58,59), 
                     Key = c("B","B","A","A","C","A","C","B","A","C","A","A","C","B","A"))

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<代码>数据_1HI BMM。你能给我们看看你已经试过的吗？你在挣扎什么？嗨@dario我试过左入：预期结果@dario你有机会看看我的问题吗？谢谢。是的，我看不出你的问题有什么明显的答案。我也有一种感觉，根据您尝试绑定的行的顺序，可能会产生多种结果。我要花相当长的时间才能想出这个问题的好答案。你必须自己做这件事，但如果你有具体问题，请在这里再次提问。很抱歉，我无法为您提供“即用”解决方案。作为最后一个提示，我将尝试：使用循环，获取一行，检查条件，相应地追加它，继续下一行。祝你好运！行的顺序不应该改变。我也在努力，但到目前为止还没有成功。我不明白你所说的“具体问题”是什么意思。

Expected_Outcome <- data.frame(Section_A = c("a","a","b","c","c"), 
                               ID1 = c(1,2,10,20,21), 
                               Key = c("A","A","C","B","C"),
                               Section_B = c("d","d", "e","e","f"),
                               ID2 = c(33,34,41,42,57))