使用Beedo Raw SQL查询时如何使用Left Join获取数据？

I am getting an error with the below code, it is not fetching any row:

type User struct {

    Id       int
    Username string
    Name     string
    Age      int
}

type Salory struct {

    Id        int
    Username  string 
    Salory    string
    Reamrk    string
}

var detail []*models.Salory 

if num, err := orm.NewOrm().Raw("SELECT salory.id, salory.salory, salory.reamrk, salory.username, user.username, user.name FROM salory LEFT JOIN user ON salory.username = user.username ORDER BY id ASC",).QueryRows(&detail); 
err == nil {
      fmt.Printf("%d Total rows read
", num)

        for _, post := range detail {

            fmt.Printf("Id: %d, UserName: %d, Name: %s
", post.Id, post.Salory.Username, post.Remark)
            }


    }

I want to know the concept of Left Join in Beego Using Raw SQL to query