使用联接更新表的多行列

Question

EDIT

I tried this query but got an error:

UPDATE consultation_med
SET consultation_med.given_quantity = 0
FROM
consultation_med
left join consultation on consultation.consultation_id = consultation_med.consultation_id
left join visit on visit.visit_id = consultation.visit_id
 WHERE visit.visit_id='191'
           AND consultation_med.given_quantity = '361'

the error:

Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM consultation_med left join consultation on consultation.consultation_id = c' at line 3

END EDIT

I need to update a table called consultation_med and change the given_quantity of a medication into 0 when the status of a visit visit_status is changed from Active to Inactive .

Please take note that in the visit table, each visit_id can have multiple consultation_id in the next table which is consultation . And in each consultation_id doctors can give multiple medication with different quantities so we have now for each consultation_id multiple rows in consultation_med table.

Here are the tables:

So let's take the visit_id=173 that already had 4 consultation_id and in each consultation doctors prescribed 1 medication. So we have 4 rows related to visit where visit_id=173 in consultation_med table. The data entry had an error and he need to send an request to the admin by changing the status of this visit to Inactive , so every medication quantity given should be back to inital storage, thus we should change the given_quantity of each 4 rows to 0 .

I tried in PHP the following query but apparently it is taking just one row and updating it:

$med_pharmacy_id = $res['med_pharmacy_id'];
$consultation_med_id = $res['consultation_med_id'];

$update = "UPDATE consultation_med 
SET given_quantity = 0 
WHERE med_pharmacy_id = :mid
AND clinic_id = :cid 
AND consultation_med_id = :cmid";

Then I tried to use left JOIN inside update query:

UPDATE consultation_med 
left join consultation on consultation.consultation_id = consultation_med.consultation_id
left join visit on visit.visit_id = consultation.visit_id

SET consultation_med.given_quantity = 0 
WHERE visit.visit_id='173'
AND consultation_med.given_quantity = '361'

The query is still wrong plus an extra error which is:

Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Editor and reconnect.

Answer 1

您需要在SQL编辑器中的编辑或设置->首选项中将错误“ 1175”更改为DISABLE SAFE MODE，或者您应该使用phpmyadmin。

Answer 2

In MySQL, you should write the update statement as: update-join-set-where

Something like this:

UPDATE consultation_med
LEFT JOIN consultation on consultation.consultation_id = consultation_med.consultation_id
LEFT JOIN visit on visit.visit_id = consultation.visit_id
SET consultation_med.given_quantity = 0
 WHERE visit.visit_id='191'
           AND consultation_med.given_quantity = '361'

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