2つのcsvの実装例をマージするために移動します。

package main

import (
 "encoding/csv"
 "log"
 "os"

 "fmt"
)

func join(fileName1 string, fileName2 string) (row [][]string) {
 fs1, _ := os.Open(fileName1)
 r1 := csv.NewReader(fs1)
 content1, err := r1.ReadAll()
 if err ! = nil {
  log.Fatalf("can not readall, err is %+v", err)
 }

 fs2, _ := os.Open(fileName2)
 r2 := csv.NewReader(fs2)
 content2, err := r2.ReadAll()
 if err ! = nil {
  log.Fatalf("can not readall, err is %+v", err)
 }
 row = make([][]string, len(content1[1:]))

 for i, row1 := range content1[1:] {
  for _, row2 := range content2[1:] {
   if row1[0] == row2[0] {
    row[i] = append(row[i], row1[0], row1[1], row1[2], row2[1], row2[2])
   }
  }
 }
 return
}

func edit(filename string, row [][]string) {
 f, err := os.Create(filename)
 if err ! = nil {
  panic(err)
 }
 defer f.Close()

 //prevent garbled code
 f.WriteString("\xEF\xBB\xBF")
 w := csv.NewWriter(f)
 w.Write([]string{"ID", "name", "gender", "course", "score"})
 w.WriteAll(row)
 w.Flush()
}

func main() {
 row := join("1.csv", "2.csv")
 fmt.Println(row)
 edit("join.csv", row)
 fmt.Println("merge is done! ")
}