如何使用此查询选择更多列

Question

I just need to know how I would place more table columns in this query, like major ect.

Thank you!

MySqlDataAdapter adap = new MySqlDataAdapter(@"SELECT * FROM student", conn);
            MySqlCommandBuilder sqlCmd = new MySqlCommandBuilder(adap);
            DataSet sqlSet = new DataSet();
            adap.Fill(sqlSet, "studentNumber");
            conn.Close();
            return sqlSet;

EDIT:

I think I asked the question wrong, I dont want entries from another table..I need the following.

I have a table called student , in this table I have 4 columns, one of them being studentNumber another being major another gradePointAverage . How to I add these columns into the code above?

EDIT NUMBER 2:

I know how to do the SELECT statement, I was more looking for help on this section adap.Fill(sqlSet, "studentNumber"); How do I put the major column into that?

Answer 1

使用以下查询

select students.*,table2.major from student inner join table2 on student.it = table2.id

Answer 2

you can specify the columns names as below

"SELECT studentNumber,major   FROM student"

since you have * that means select all the columns, your code will return all the table columns

Answer 3

您可以使用联接查询来选择更多列，但前提是下面两个表中的列名称相同时才是查询SELECT t1.column AS column1，t2.column AS column2 FROM table1 AS t1 LEFT JOIN table2 AS t2 ON t1.column = t2 。柱

Answer 4

I have a table called student, in this table I have 4 columns, one of them being studentNumber another being major another gradePointAverage. How to I add these columns into the code above?

So select your columns in your query.

Change

MySqlDataAdapter adap = new MySqlDataAdapter(@"SELECT * FROM student", conn);

to

MySqlDataAdapter adap = new MySqlDataAdapter(@"SELECT studentNumber, major FROM student", conn);