How does PHP operate the database once to reduce the number of fields in a table once?

How does PHP perform operations on a database to reduce the name of a table field by ces?

Id cid name cun1 2 test La 2 2 test 1 la 3 2 test 2 la

Table name: cuns

Cid title current 2 test 3

For example, if I use PHP to delete a field with id 1 in the ces table, after deletion, the current field of the field with cid 2 in the cuns table will decrease

Reply to discussion (solution)

Trigger: execute the SQL code when deleting the trigger. how to write many of them in Baidu? the main consideration is performance.

Upstairs is a type,
Is there another way to update the cuns table at the same time?
What are your requirements?