semi_join只返回x表格中中可以跟y表格匹配的行,anti_join返回x表格中与y表格不匹配的行。 nest_join() returns all rows and columns in x with a new nested-df column that contains all matches from y. When there is no match, the list column is a 0-row tibble. nest_join()类似left_join(),...
R语言semi_join(),anti_join(),nest_join()函数 Filtering joins filter rows from x based on the presence or absence of matches in y: semi_join() return all rows from x with a match in y. anti_join() return all rows from x without a match in y. # "Filtering" joins keep cases fro...