如何在R中合并表(weekdays())

# 创建两个示例数据框
df1 <- data.frame(ID = c(1, 2, 3),
                  Name = c("John", "Mary", "Tom"))
df2 <- data.frame(ID = c(2, 3, 4),
                  Age = c(25, 30, 35))

# 使用merge()函数合并表
merged_df <- merge(df1, df2, by = "ID")

# 输出合并后的表
print(merged_df)

install.packages("dplyr")
library(dplyr)

# 创建两个示例数据框
df1 <- data.frame(ID = c(1, 2, 3),
                  Name = c("John", "Mary", "Tom"))
df2 <- data.frame(ID = c(2, 3, 4),
                  Age = c(25, 30, 35))

# 使用left_join()函数将df1和df2按照ID列进行左连接
merged_df <- left_join(df1, df2, by = "ID")

# 输出合并后的表
print(merged_df)