Question

select t1.columnFK from table1 t1, table2 t2 where t1.columnFK=t1.columnpk AND t2.somecolumn='value1'



select t2.columnPK from table2 t2 where t2.somecolumn='value2'

So I have to update all the values from first select statement with the values of second one.
I tried writing update query like this:

UPDATE table1
SET table1.columnFK = table2.columnPK
From tabel1 t1, table2 t2
Where t1.columnfk=t2.columnpk AND somevalue='value2'

Here is the relationship
table2.columnpk is referenced as table1.coulmnfk.
table1.hbm.xml

<many-to-one
            name="table2"
            column="&quot;coulmnfk&quot;"
            class="table2class"
            cascade="none"/>

Table 2 relation goes like this:

<set name="table1" table="&quot;table1&quot;" inverse="true"  cascade="none">
                <key column="&quot;coulmnFK&quot;"/>
                <one-to-many class="table1"/>
            </set>

Not sure how would I include first condition.

Answer 1

I stil find your referential integrity a bit odd to accept. Usually child table fk is updated with parent pk.

Here is the logic you may need to use, assuming you cureently have parent pk as a fk in your child talble and you are trying to add child pk as a fk into parent table…using a join

UPDATE parent
SET parent.childPK = child.PK    
FROM
    Parent
    JOIN
    child ON parent.PK = child.ParentPK
WHERE parent.somecolumn in ('value1','value2')
;