How to Get Data From Two Tables - PHP and MySQL

Question

I have two tables in MySQL as below:

Table1 as below:

ID (Primary Key Auto Increment) | Student Name | Age

Table2 as below:

Teacher Name | Student ID (This is the Student ID from table1) | Email | Education

Now I want to get data from both the tables table1 and table2 in a single query.

I want to retrieve the values from both tables where Student ID is equals to something.

Student Name | Age | Teacher Name

Can you please let me know how can I query values from two tables as mentioned above. I have read many tutorials but I can not retrieve it properly. I am new to MySQL so please explain clearly. What should I use table join, union, inner or outer join?

Answer 1

If there is no relationship between the tables eg. primary foreign key you should make two separate queries.

If you want to use a join you will need to create the relationship between the tables. Eg a course ID that would link the teachers table to the students table.

That way you could say show me the student and teacher names/ages from course X

Answer 2

Try this tutorial here .

You should implement relation by using foreign keys in your tables.

UPDATED You query should be something like this:

SELECT t1.StudentName, t1.Age, t2.TeacherName
FROM table1 t1, table2 t2
WHERE t1.id = t2.studentid;

Answer 3

Suppose you have table like Student(Stud_id,Stud_Name,Stud_Age) and another table like Teacher(TeacherName,StudentID,Email,....). Here StdentID should be the foreign key in Teacher, And Stud_Id Should primary key in Student.We are assuming the StudentID and Stud_ID values are same

Then try this,

SELECT Stud_Name, Stud_Age ,TeacherName FROM Student INNER JOIN Teacher ON Stud_id = StudentID