Question

I’ve got two tables:

Table Name: One
id  | status
----+--------
1   | 1
2   | 1
3   | 1

Table Name: Two
id  | model
----+--------
1   | m001
2   | m002
3   | m003

Let’s say I want to change the status of m001 to 0. How can I achieve this using an SQL statement? i.e. if model = m001, get id, go to table.one, change status to 0.

Answer 1

Since you haven’t mentioned your RDBMS, try any of these:

For MySQL

UPDATE  One a
        INNER JOIN Two b
            ON a.ID = b.ID
SET     a.Status = 0
WHERE   b.model = 'm001'

For MSSQL

UPDATE  a
SET     a.Status = 0
FROM    One a
        INNER JOIN Two b
            ON a.ID = b.ID
WHERE   b.model = 'm001'

Which works on other DBMS

UPDATE  One 
SET     Status = 0
WHERE   ID = (  SELECT ID
                FROM two 
                WHERE model = 'm001')