스크린 샷에서 볼 수있는 것처럼 학생 정보가 포함 된 테이블 Study
이 있습니다. 나는 다음 쿼리 study_id = 501
아래 행의 바로 study_start
열을 업데이트 쓴 :불필요한 mysql 열 업데이트
student_id
은 모든 학생의 고유 한 ID입니다
UPDATE
student,language_german,language_english,study,home_university,
host_university,transfer,home_address,host_address,alumni
SET
firstname = 'Omega',
lastname = 'Rugal',
birthdate = '0000-00-00',
nationality = '',
email= '',
group_name = '',
gender = '',
religion = '',
creation_date = NOW(),
user_id = 43,
german_level = '',
german_status = '',
german_grade = '',
english_level = '',
english_status = '',
english_grade = '',
transfer_type = '',
study_start = "2013-02-01",
matriculation_no = '0',
application_no = '0',
applicationno_old = '0',
overall_status = '',
status_date = '0000-00-00',
comment = ' ',
thesis_status = '',
home_university_name = '',
home_degree_program = '',
home_study_program = '',
host_university_name = '',
host_degree_program = '',
host_study_program = '',
room_status = '',
room_deposit = '0',
room_name = '',
application_letter_home = '0',
motivation = '',
sponsorship = '',
application_letter_abroad = '0',
cv = '0',
result = '',
learning_agreement = '0',
health_insurance = '0',
supervisor_home = '',
supervisor_abroad = '',
visa = '0',
vaccination = '0',
wishlist = '',
home_street = '',
home_co = '',
home_zip = '',
home_city = '',
home_state = '',
home_country = '',
host_street = '',
host_co = '',
host_zip = '',
host_city = '',
host_state = '',
host_country = '',
thesis_grade = '0.0',
average_grade = '0.0',
study_time = '0',
last_email = '',
last_contact = '0000-00-00',
last_info = ''
WHERE
student.student_id = language_german.student_id
AND student.student_id = language_english.student_id
AND study.study_id = home_university.study_id
AND study.study_id = host_university.study_id
AND student.student_id = transfer.student_id
AND student.student_id = home_address.student_id
AND student.student_id = host_address.student_id
AND student.student_id = alumni.student_id
AND student.student_id = 832
.
끔찍한 일이 다른 행의 모든 열이 정상이이 값 study_start
으로 업데이트받을 것입니다.
study_start 열만 업데이트하려는 경우 다른 모든 열을 특정 값으로 설정하는 이유는 무엇입니까? –
이 쿼리에서 study_id = 501은 어디에 있습니까? –