The idea of id's is that they are meaningless, so saying "this row was supposed
to be 33" is senseless.
If you want Dar es Salaam to be 33 because eg it's the postal code, then add a
column postal_code to your region table
but keep the id to make the reference.
>>> James Kitambara <[EMAIL PROTECTED]> 2008-09-17 11:13 >>>
Thank you !
But I think that there is a solution.
If it happens that you have the following data in your tables
REGION
--------------------------------------
region_id | region_name
--------------------------------------
11 | Dodoma
22 | Tabora
99 | Dar es Salaam THIS ROW WAS SUPPOSED TO BE: '33', 'Dar es
Salaam'
DISTRICT
------------------------------------------------------------
dist_id | dist_name | region_id
------------------------------------------------------------
001 | Kongwa | 11
002 | Ilala | 99
003 | Temeke | 99
003 | Kinondoni | 99
For this UPDATE I wanted, when I change the region _id from '99' to '33' of the
last ROW in REGION table AUTOMATICALLY to change the last three ROWS of the
DISTRICT table which reference to '99', 'Dar es Salaam'.
If I do this, I will get the error message "You can not change region_id other
tables are reference to it.
HOW CAN DO THIS? (AUTOMATIC UPDATE OF FOREIGN KEY)
-----------------------------------ORGINAL
MESSAGE---------------------------------------
I think (one of) the point(s) of id fields is not to change them. You can
update the region_name field (eg a correct a misspelling), but the id stays the
same.
That way the district stays connected to the same region.
>>> James Kitambara <[EMAIL PROTECTED]> 2008-09-17 8:50 >>>
Hello Mambers of PGSQL-SQL,
I have two tables namely:
REGION (region_id, region_name)
DISTRICT (dist_id, dist_name, region_id (FK))
I would like to have the CREATE TABLE Command which will create these tables in
such a way that when REGION table is UPDATED automatical the FOREGN KEY in
DISTRICT table is also updated.
I will appriciate for your assistance !
Regards
James Kitambara
