SQL根据另一个表中的ID更新特定行

Question

I have two tables

Price
RET_ID DBS_ID RRP

Database
DBS_ID PRO_ID

I would like to use UPDATE such that I can increase RRP in the Price table by 20% if the PRO_ID in the Database table is = 1

UPDATE
  ( SELECT RRP
    FROM PRICE
      JOIN database
        ON database.dbs_id = price.dbs_id
  )
SET rrp = 100
WHERE (database.pro_ID = 1);

I've been trying all manner of INNER JOIN ... ON to no avail. Thanks.

Answer 1

You can put the filtering condition in the where clause. Here is a method using exists :

update price p
    set rpr = rpr * 1.2
    where exists (select 1
                  from database d
                  where d.dbs_id = p.dbs_id and d.pro_id = 1
                 );

Here is another way using in :

update price p
    set rpr = rpr * 1.2
    where p.dbs_id in (select d.dbs_id
                       from database d
                       where d.pro_id = 1
                      );

Answer 2

    UPDATE Price P SET RRP = RRP*1.2
 WHERE EXISTS 
(select  1 from Database 
where DBS_ID = P.DBS_ID AND PRO_ID = 1);

Answer 3

You can use this query

MERGE INTO PRICE P 
 USING DATABASE D ON
(P.DBS_ID=D.DBS_ID) AND
D.PRO_ID=1
WHEN MATCHED
THEN
UPDATE SET
P.RRP=P.RRP*1.2;

When you are updating table from another table, always use MERGE function which is an amazing concept in SQL