I have two tables, one which stores the registered students, lets call it students_register . The second table keeps examination details of the students, lets call it exam_details . In the students_register table, i store:
student registration number
first name
last name
email_address
date_of_birth
and other details.
In the exam_details table, i store the registration number and the students marks in the different subjects.
Now, the challenge is that i want to query the exam_details table and display the data in a table but instead of displaying the students registration number, i want to associate the registration number in the exam_details table to that in the students_register table so that i can display the student's names instead of the registration number.
How can i go about this?
1. students_register table
id reg_number first_name last_name email_address dob
1 P2894 John Smith john@example.com 12/05/1990
2. exam-details table
id reg_number english maths chemistry biology physics
1 P2894 60% 80% 50% 72% 64%
How do i display this data in a table such that i have
first_name last_name english maths chemistry biology physics
John Smith 60% 80% 50% 72% 64%
SELECT tb2.first_name, tb2.last_name, tb1.english, tb1.maths, tb1.chemistry, tb1.bilogy, tb1.physics
FROM exam_details AS tb1
INNER JOIN students_register AS tb2
ON tb1.reg_number = tb2.reg_number
Take a look at SQL Joins -> http://www.w3schools.com/sql/sql_join.asp
With a simple JOIN query:
SELECT id, student_register.reg_number, first_name,
last_name, english, maths, chemistry, etc
FROM student_register
JOIN exam-details ON student_register.reg_number = exam-details.reg_number
There is no need to use JOIN
here. I think this is the easiest way.
SELECT
sr.first_name,
sr.last_name,
ed.english,
ed.maths,
ed.chemistry,
ed.biology,
ed.physics
FROM
students_register sr,
exam_details ed
WHERE
sr.reg_number = ed.reg_numver
参见JOIN
。
SELECT first_name, last_name, english, maths, chemistry, biology, physics FROM exam_details AS ex JOIN students_register st ON (ex.reg_number = st.reg_number)
SELECT * FROM student-register INNER JOIN exam-details ON student-detail.reg_number=exam-details.reg_number
may be your query. Then you print out whatever you like.
select first_name, last_name, english, maths, chemistry, biology, physics
from students_register, exam_details
where students_register.reg_number=exam_details.reg_number
您必须加入这两个表
SELECT s.first_name, s.last_name, e.english, e.maths, e.chemistry; e.biology, e.physics FROM students_register s LEFT JOIN exam_details e USING (reg_number)
May be this will help u.
select students_register.first_name,students_register.last_name,exam-details.english, exam-details.maths, exam-details.chemistry, exam-details.biology, exam-details.physics from exam-details left join students_register on students_register.reg_number=exam-details.reg_number
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