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Unanswered: Help - Column Data Migration
I have a situation where all the data in a column of Table2 needs to be migrated to another column of Table1 based on a join condition.
Table1 has A,B,C
Table2 has X,Y,Z. ( Y foreign key to A of Table1)
I add a new column Z to Table1 and need all the Table2 Z values in Table1 Z column where Table1.A = Table2.Y
How can I do this in Db2 via SQL, Stored Procs or any other DB2 tools?
I tried Insert statements such as follows ,. but does not work
Insert into Table1(Z)
select Table2.Z from Table1,Table2 where Table1.A = Table2.Y
Then, if multiple rows of Table2 matched with a row of Table1,
Y foreign key to A of Table1
what to do?
Here is an exmple,
if multiple rows of Table2 matched with a row of Table1,
choose one by some additional conditions.
For example: Take maximum value.
USING (SELECT y
, MAX(z) AS z
ON t2.y = t1.a
WHEN MATCHED THEN
SET z = t2.z
Last edited by tonkuma; 07-13-11 at 01:44.