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R language data Table import data practice: data It is more convenient to set key, compound key, delete key and data join after setting key value. After setting key value, you can use keyby syntax ins

2022-04-22 12:41:00 【Data+Science+Insight】

R Language data.table Import data practice :data.table set key value （key）、 Composite key setting 、 Delete key 、 Data connection after setting key value （join） It is more convenient 、 After setting the key value, you can use keyby Grammatical substitution by grammar

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