如何使用R匹配3个表？一个表有多个对应关系

# 创建示例表A
tableA <- data.frame(key = c("A", "B", "C", "D"),
                     valueA = c(1, 2, 3, 4))

# 创建示例表B
tableB <- data.frame(key = c("B", "C", "D", "E"),
                     valueB = c(5, 6, 7, 8))

# 创建示例表C
tableC <- data.frame(key = c("C", "D", "E", "F"),
                     valueC = c(9, 10, 11, 12))

# 使用merge()函数匹配三个表
mergedTable <- merge(merge(tableA, tableB, by = "key"), tableC, by = "key")

# 打印合并后的表
print(mergedTable)