SELECT *
FROM subjects
INNER JOIN entries ON entries.subject_id= subjects.subject_id
INNER JOIN students ON entries.student_id=students.student_id
WHERE subjects.exam_board LIKE ‘OCR’;
when i execute this the error unknown column 'OCR' in where clause
The following is my subject table
INSERT INTO subjects
(subject_id, subject_name, level_of_entry, exam_board)
VALUES
(1, 'chemistry', 'AS', 'OCR');
INSERT INTO subjects
(subject_id, subject_name, level_of_entry, exam_board)
VALUES
(2, 'biology', 'GCSE', 'AQA');
INSERT INTO subjects
(subject_id, subject_name, level_of_entry, exam_board)
VALUES
(3, 'music', 'GCSE', 'Edexcel');
the below is my students table
INSERT INTO students
(student_id,first_name,middle_name,last_name,email,password,reg_date)
VALUES
(NULL, 'Tom', 'Michael', 'ford', 'tom@yahoo.com','tom1234','2003/12/08');
INSERT INTO students
(student_id,first_name, middle_name, last_name, email, password, reg_date)
VALUES
(NULL, 'michael', 'scoffield', 'burrows', 'lincoln@yahoo.com', 'lincoln1234', '2001/12/16');
You have to use '(single quote) sign insted of ` in like clause hope below code will help you
SELECT *
FROM subjects
INNER JOIN entries ON entries.subject_id= subjects.subject_id
INNER JOIN students ON entries.student_id=students.student_id
WHERE subjects.exam_board LIKE 'OCR';
SELECT *
FROM subjects
INNER JOIN entries ON entries.subject_id= subjects.subject_id
INNER JOIN students ON entries.student_id=students.student_id
WHERE subjects.exam_board LIKE 'OCR';
Your using the wrong type of quote.
You may also want to update your LIKE to be
WHERE subjects.exam_board LIKE 'OCR%';
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