小编Kum*_*thy的帖子

我试图将table1中的数据插入table2

insert into table2(Name,Subject,student_id,result)
select (Name,Subject,student_id,result)
from table1;

table2的关键是student_id.

假设没有任何重复.

我收到错误: MySQL error 1241: Operand should contain 1 column(s)

table2中只有四列.

我有一个MySQL表,看起来像这样:

Name    | Pass |  Fail | Pass Percent | Fail Percent

Abdy    | 20   |  5    |              |
Bob     | 10   |  5    |              |
Cantona | 40   |  10   |              |
Dave    | 30   |  20   |              |

我想要获得百分比:

喜欢:passpercent =(传递/传递+失败)*100

我可以用两个列的单个MySQL代码填充表吗？

表有希望看起来像这样:

Name    | Pass |  Fail | Pass Percent | Fail Percent

Abdy    | 20   |  5    |   80         |  20
Bob     | 10   |  5    |   66         |  33
Cantona | 40   |  10   | …

我通过使用Go语言创建http测试服务器在一些其他电话上运行UT。我的代码如下。

type student struct{
FirstName string
LastName string
}

func testGetStudentName() {
    testServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    response = new(student)
    response.FirstName = "Some"
    response.LastName = "Name"
    b, err := json.Marshal(response)
    if err == nil {
            fmt.Fprintln(w, string(b[:]))
        }
    }))
    defer ts.Close()
    student1 := base.getStudent("123")
    log.Print("testServerUrl",testServer.URL) //prints out http://127.0.0.1:49931 ( port changes every time this is run)

   ts.URL = "http://127.0.0.1:8099" //this assignment does not quite change the URL of the created test server.
}

在要测试的文件中，

var baseURL = "http://originalUrl.com" …