Inserting value in one column from another table mysql - php

Question

school
+-----+-----------+----------+
| id | the_photo | column3 |
+-----+-----------+----------+
| 11 | NULL | abc |
| 22 | NULL | asf |
| 33 | NULL | asag |
+-----+-----------+----------+
school_images
+-----+-----------+-------+
| id | school_id | photo |
+-----+-----------+-------+
| 1 | 11 | 1 |
| 2 | 22 | 0 |
| 3 | 33 | 1 |
+-----+-----------+-------+
...
Need to insert values into the_photo column of school only if photo value = 1 for school_images like this:
School
+-----+-----------+
| id | the_photo |
+-----+-----------+
| 11 | 1 |
| 22 | NULL |
| 33 | 3 |
+-----+-----------+
Is there a simple query that can be written to do this for all rows? For one row i know how to insert it but how can i auto inert for multiple rows.

Answer 1

This might be what you're looking for: SELECT INTO.
Taken from the link:
INSERT INTO tbl_temp2 (fld_id)
SELECT tbl_temp1.fld_order_id
FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100;

Answer 2

BEWARE!! This answer is good only if you want to perform the above requested action upon a new insertion. Otherwise, you will need a different strategy
you should have something like this:
Select all you values from school_images then foreach them:
foreach($result as $res) {
if($res['photo'] == 1) {
// see step 2
} else {
// see step 3
}
}
if you have the value 1 in school_photos then:
INSERT INTO school (the_photo, colum3) VALUES ($res['id'], $some_value)
if you don't have it, then perform a normal insert like you did by now.

Answer 3

You can also use inner join to achieve that.
Update School inner join school_images on School.id = school_images.school_id and photo=1
set the_photo = school_images.id ;

Answer 4

You should use an INNER JOIN to join school with school_images:
UPDATE
school INNER JOIN school_images
ON school.id = school_images.school_id
AND school_images.photo=1
SET
school.the_photo=school_images.id

Answer 5

UPDATE school AS s, school_images AS si SET s.the_photo = si.id WHERE s.id = si.school_id AND si.photo = 1;