在多个值上更新SQL查询

Question

I have two models one is student_profile where I have university field to show university name. I have a list of universities where I need to update another table called Package only if one of the university exists in table. Table has 1000 records and I need to update all the entries with one query.

1. If university a, b, c, d exists in student_profile .
2. Update few "Package" table fields.

My tables:

 +---------------------------+
 | student_profile           |
 +---------------------------+
 | id         | int(11)      |
 | first_name | varchar(45)  |
 | last_name  | varchar(45)  | 
 | university | varchar(45)  | 
 +---------------------------+

 +---------------------------+
 | package                   |
 +---------------------------+
 | student_id  | int(11)     |
 | is_active   | tinyint     |
 | package_type| varchar(45) | 
 +---------------------------+

ForeignKeys in StudentProfile Table:

name = student_package
schema = mydb
Column = student_id
reference Schema = mydb
referenced table = student_profile
referenced column= id

If university exists I need to set is_active=True and set package.student_id as student_profile.id and package.package_type as ' UniverityEnrolled '.

Answer 1

Based on what I understand of the question, this may be your solution:

UPDATE package 
    SET is_active = 1,package_type = "UniversityEnrolled"
WHERE student_id IN 
(SELECT id FROM student_profile WHERE university IN ("a","b","c","d"))

Answer 2

To figure something like this out, start with a SELECT that outputs the records to be updated.

Then when it is working, convert to an update statement.

SELECT *
FROM `StudentProfile` a
JOIN `Package` b
ON a.`id` = b.`student_id`
WHERE `university` in ('a','b','c');

UPDATE `StudentProfile` a
    SET `is_active` = 1
JOIN `Package` b
ON a.`id` = b.`student_id`
WHERE `university` in ('a','b','c');