MySQL查询基于另一个表的ID替换名称

Question

i have two tables clients and well_names

Table Clients

id,name
1   ABC
2   TEST
3   XYZ

Table well_names

id,operator
1   ABC
2   ABC
3   ABC
4   TEST
5   TEST
6   XYZ
7   XYZ

I want to select id from clients tables and update on operator column in well_names table.

Expected output

Table well_names

id,operator
1   1
2   1
3   1
4   2
5   2
6   3
7   3

Answer 1

This query will work:

SELECT a.id, b.id 
FROM clients as a LEFT JOIN well_names as b ON a.name = b.operator

Answer 2

select w.id as id, 
       c.id as operator
from join tbl_well w 
inner tbl_client c
on c.operator = w.operator

Answer 3

You can use subquery with update statement :

update well_names w
      set operator = (select c.id from Clients c where c.name = w.operator);

Answer 4

UPDATE well_names WN
INNER JOIN Clients C ON WN.operator = C.operator 
set WN.operator = C.id