SQL命令从表中删除数据id在两个表中的表

Question

I am trying to delete a row in ie table 2 where the id is copied from table 1 query. I want to delete this row from table 2 and also from table 1 but I am having an issue where the command I have used all work but it does not seem delete from the tables. I believe this might be because of the relationship the tables have(I used mysql workbench to make the DB design)

I used this command :

delete
from doctorsTable
where Users_idUser in (select Users_idUser from Users where idUser = 20)

This is the relation :

As mentioned, I am trying to delete the row from doctorsTable with Users_idUser=20 and automatically it would delete from Users table idUser also with 20. I have tried the above command, it seems to run but its not really deleting the rows . please help !

Answer 1

I think what you want to do is to delete all rows with idUser from both tables with one statement.

You can do so by joining and deleting them like:

DELETE doctorsTable, Users
FROM doctorsTable
INNER JOIN Users ON doctorsTable.Users_idUser = Users.idUser
WHERE doctorsTable.Users_idUser = 20

In the DELETE line, you specify the table(s) from which to delete matching rows.