FOREIGN KEY across 2 schemas with ON DELETE CASCADE

I found I could define
ALTER TABLE user2.foo ADD CONSTRAINT fk_bar bar REFEERENCES
user1.foobar;
if user1 hat granted SELECT and REFERENCES to users2.
But what, if I want to have
ALTER TABLE user2.foo ADD CONSTRAINT fk_bar bar REFEERENCES
user1.foobar ON DELETE CASCADE;
I made
GRANT DELETE ON foo to users1
as user2
But I get ORA-02292 (child-record exists) if I delete a row in user1.bar wich ha s a related row in user2.foo
Any idea what to do ?

Sorry i made a mistakte in my test. It will allso work with ON DELETE CASCADE

Similar Messages

Drop foreign keys and recreate foreign keys with on delete cascade dymanica

I need to drop foreign keys and recreate foreign keys with on delete cascade dymanically via a script. Does anyone have a script available?

You could also disable the integrity contraints.
SET PAGESIZE 0
SET FEEDBACK OFF
SET PAUSE OFF
-- create a disable script
SPOOL do_disable.sql
SELECT 'ALTER TABLE '
       || table_name
        || chr(10) ||
       'DISABLE CONSTRAINT '
        || constraint_name
        || ';'
FROM user_constraints
WHERE constraint_type = 'R'
   AND status = 'ENABLED'
select 'alter trigger '
       || trigger_name
        || ' disable;'
from user_triggers
where status = 'ENABLED'
SPOOL OFF
-- now create a enable script as well
SPOOL do_enable.sql
SELECT 'ALTER TABLE '
       || table_name
        || chr(10)
        || 'ENABLE CONSTRAINT '
        || constraint_name
        || ';'
FROM user_constraints
WHERE constraint_type = 'R'
   AND status = 'ENABLED'
SELECT 'ALTER trigger '
       || trigger_name
        || ' ENABLE;'
FROM user_triggers
WHERE status = 'ENABLED'
SPOOL OFF
SET FEEDBACK ONif you run this script on a TESTdatabase you will end up with a do_disable.sql and a do_enable.sql script on youre local directory.
Running do disable will disable all the currently enabled triggers and contraints.
Running do_enable.sql will enable the previously disables triggers and contraints.
be sure to test before executing this on a real live production database.
Make sure you have a good backup!

Syntax for creating foreign key across users in a database

There are two user present A,B.They are granted all privileges.Now in USER A, there is a table PARENT whose primary key is PARENT_NO.In USER B I have created a table CHILD whose primary key is CHILD_NO.
In the CHILD table of USER B, I want to create a foreign key relation to the PARENT table of USER A.For this I have created a column CHILD_PARENT_NO in the CHILD table.If anybody knows the syntax please post the syntax for creating the required foreign key relationship?

Please post your code. Cut'n'paste from SQL*Plus like this...
SQL> conn a/a
Connected.
SQL> desc t1
Name                                      Null?    Type
COL1                                               NUMBER
COL2                                               VARCHAR2(10)
SQL> grant references on t1 to b;
Grant succeeded.
SQL> conn b/b
SQL> create synonym a_t for a.t1;
Synonym created.
SQL> alter table test add constraint fk foreign key (n) references a_t(col1);
Table altered.
SQL> Note that Oracle will translate the synonym anyway...
SQL> select constraint_name, r_owner, r_constraint_name
2 from user_constraints
3 where table_name = 'TEST'
4 /
CONSTRAINT_NAME R_OWNER R_CONSTRAINT_NAME
FK              A       T1_PK
SQL> By the way, this ...
GRANT ALL PRIVILEGES TO B;... is a mindbendingly unsafe way of proceeding. In real life you would have given user B the power to utterly destroy your database. It's always easier to start with good habits than to break bad ones so please get used to granting only the minimum set of privileges necessary.
Cheers, APC

Detect the fields which are primary/foreign keys for each schema's tables

Hello everybody,
I'd like to know if it's possible to select a field in one of the dictionary tables to identify the fields of a table which are PK or FK in this one. I'd like to do this to generate the fields that I need to put in a technical design.
Actually I have this (if it can help you to understand what I'd like to do) :
select table_name "Table name",
column_name "Physical field name",
case when data_type = 'NUMBER' then data_type || '(' || NVL(data_precision,0) || ',' || NVL(data_scale,0) || ')'
when data_type = 'VARCHAR2' then data_type || '(' || data_length || ')'
else data_type
end "Datatype",
case when nullable = 'Y' then 'FALSE'
when nullable = 'N' then 'TRUE'
end "Not null",
/* Here I'd like to retrieve TRUE or FALSE if the field to display is a primary key or not and the same for foreign keys*/
from all_tab_columns
where table_name in (select table_name
from all_tables
where table_name like '%project_name%'
and table_name not like '%TMP%');
Thanks a lot for your help,
Florent

Please investigate all_constraints and all_cons_colums.
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14237/toc.htm

Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths

I am trying to introduce a constraint on the sales_details table
ALTER TABLE [dbo].[SALES_DETAILS] WITH CHECK ADD constraint fk_sd_vat FOREIGN KEY([VAT])
REFERENCES [dbo].[VAT Rate] ([VAT]) on update cascade on delete cascade
GO
I am getting the error saying
Msg 1785, Level 16, State 0, Line 1
Introducing FOREIGN KEY constraint 'fk_sd_vat' on table 'SALES_DETAILS' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
What could be the reason,Please suggest me the solution for this,
Thanks,

Hi Erland,
This is my DDl
CREATE TABLE [dbo].sales_details(
[BNUM] [varchar](20) NOT NULL,
[CNAME] [varchar](30) NOT NULL,
[CNUM] [int] NOT NULL FOREIGN KEY([CNUM])REFERENCES [dbo].[Customer] ([CNum]),
[ITNAME] [varchar](100) NOT NULL,
[ITEM#] [int] NOT NULL ,
[QTY] [int] NOT NULL,
[UNIT] [varchar](5) NOT NULL,
[PRICE] [float] NOT NULL,
[BASIC] [float] NOT NULL,
[DISCOUNT] [float] NOT NULL,
[FRQTY] [int] NOT NULL,
[BADDR] [varchar](300) NULL,
[CADDR] [varchar](300) NOT NULL,
[BDATE] [datetime] NOT NULL,
[VAT] [float] NOT NULL
ALTER TABLE [dbo].[SALES_DETAILS] WITH CHECK ADD constraint cons1 FOREIGN KEY([ITNAME])
REFERENCES [dbo].[New Item] ([Item Description]) on cascade update
GO
ALTER TABLE [dbo].[SALES_DETAILS] WITH CHECK ADD constraint FOREIGN KEY([VAT])
REFERENCES [dbo].[VAT Rate] ([VAT]) on cascade update
GO
I am getting the error when i execute second Alter statement.
Thanks,
Check if VAT Rate table has any FK with cascaded options?
Please Mark This As Answer if it solved your issue
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Visakh
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Distinctcount across star schema with boolean filter

Hi,
I have a fact table with CustomerNo, DateKey, ProductKey, SupplierKey, Sales.
This is related to a Calendar table, Product, and Supplier Table.
I'm trying to calculate a distinct count of customer where the sales = 0 and keeping the original filter conditions on related tables.
I've tried :
Calculate(Distinctcount(fact[CustomerNo), Fact[Sales]=0)
The figures are wrong. It's hard for me to evaluate what rows are actually being returned due to the size of the table. I think it may be related to the the DistinctCount running a groupby first and the filter being run second.
So I tried :
Calculate(Distinctcount(fact[CustomerNo), Filter(Fact, Fact[Sales]=0))
This returns the same value as the one above.
It's very weird as the slicers on the Pivot do interact with the measure so I know the measures are keeping the existing filter contexts.
Any ideas what is happening?
Lee Hawthorn ACMA, CGMA View my Performance Management blog at leehbi.com

well, the formula you provided is correct and should return the correct result
its hard to say why it would return wrong results without knowing/seeing the data
the only thing i could think of is the following:
a customer made two sales 1) with Sales=123 2) with Sales=0
the formula would of course count that customer as a distinct customer with Sales=0
maybe thats the reason for your "wrong" results?
you may also check this link: http://www.daxpatterns.com/distinct-count/
hth,
gerhard
Gerhard Brueckl
blogging @ http://blog.gbrueckl.at
working @ http://www.pmOne.com

Assigning a foreign key

i have created a database which is administered by ora1 who created 2 tables called student and instructor then created a new user called dev1 with dba priviliges dev1 created a table called university assigned a primary key to the university_id column and has added new columns to the instructor and student tables owned by ora1 the problem i am having is i am unable to assign foreign keys to the 2 tables owned by ora1 even though dev1 could add the extra university_id columns to the 2 tables the code i am using to add extra columns and assign the foreign keys is as follows:
alter table ora1.student
add (university_id varchar2 (5));
alter table ora1.student add
constraint student_fk1
foreign key (university_id)
references university (university_id)
on delete cascade;
I keep getting error message saying table or view does not exist

hi u are using the right format
ALTER TABLE <table_name>
ADD <constraint_name> FOREIGN KEY
(<column_name1> ,
<column_name2> )
REFERENCES <table_name>
(<column_name1> ,
<column_name2>)
ALTER TABLE ora1.student
ADD student_fk1 FOREIGN KEY
(university_id)
REFERENCES university (university_id)the problem may be your table doesnot exist or u are refering the table which is in different schema
Regards
Hitesh

Foreign Key Error Message ORA - 01430

I have a table name LSU_INTER_RESOURCES_T. I would like to add a foreign key constraint with the following command:
alter table lsu_inter_message_t
add constraint inter_message_id_fk
inter_request_id REFERENCES lsu_inter_requests_t(inter_request_id) ON DELETE CASCADE;
The system returned the error message:
ORA - 01430: column being added already exists.
if I drop the column inter_request_id I will lose data and when I create the constraint it places the column at the end of the table. Losing data is not an issue now because the table has no data but down the line I can see that this will be a real real hassle.
I would like to have the foreign key column defined in the sequence I chose when I designed the table layout. That is to say I want all of the key columns placed at the begining of the table row layout.
Can I move the column after I define it and how is this done? Is this a 10g feature?
Thank you, Ned

Try
alter table lsu_inter_message_t
add constraint inter_message_id_fk
foreign key(inter_request_id ) REFERENCES lsu_inter_requests_t(inter_request_id) ON DELETE CASCADE;

Accurate statistics on skewed foreign key when coming from parent

Hi,
I will be as short as possible:
- we have two tables in a parent - child relationship. The foreign key is very skewed and we need to get child details coming from the parent
- CBO is not considering the skeweness from histograms on foreign key column (I suppose it cannot as it is the example without going into tables) and it calculates the expected returning rows in the execution plan as no_rows / distinct_values => 10,000 / 3 = 3,333 rows for both execution plans, even if they returns effectively 1 row / 9,999 rows. In histograms exists this information but it cannot be extracted by CBO as it is.
Any idea how to help CBO to choose separate execution plans for query 1 and query 2 excluding hints or query modifications?
-- Oracle Database 10.2.0.3
--DROP TABLE child;
--DROP TABLE parent;
CREATE TABLE parent AS SELECT LEVEL parent_num, 'parent_' || LEVEL parent_id FROM DUAL CONNECT BY LEVEL <= 10;
ALTER TABLE parent ADD CONSTRAINT parent_pk PRIMARY KEY (parent_num);
CREATE UNIQUE INDEX parent_id_ix ON PARENT (parent_id, parent_num);
CREATE TABLE child AS SELECT DECODE (LEVEL, 1, 1, 10000, 10, 5) parent_num, 'child_' || LEVEL child_id FROM DUAL CONNECT BY LEVEL <= 10000;
ALTER TABLE child ADD FOREIGN KEY (parent_num) REFERENCES parent (parent_num) ON DELETE CASCADE;
CREATE INDEX child_parent_num_ix ON CHILD(parent_num);
exec dbms_stats.gather_table_stats(ownname=>'***REPLACE WITH YOUR OWN USER***',tabname=>'PARENT',estimate_percent=>100,cascade=>TRUE,method_opt=>'FOR ALL COLUMNS SIZE 1');
exec dbms_stats.gather_table_stats(ownname=>'***REPLACE WITH YOUR OWN USER***',tabname=>'CHILD',estimate_percent=>100,cascade=>TRUE,method_opt=>'FOR COLUMNS parent_num SIZE 3, child_id SIZE 1');
-- QUERY 1: this query should be very selective (1 row), using index
SELECT c.child_id FROM child c, parent p WHERE c.parent_num = p.parent_num AND p.parent_id = 'parent_1';
-- QUERY 2: it should return 99.9999% of the rows (9,999 rows), so it should use full table scan
SELECT c.child_id FROM child c, parent p WHERE c.parent_num = p.parent_num AND p.parent_id = 'parent_5';
In reality both queries have the same execution plan as below:
Execution Plan
Plan hash value: 4033709836
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 3333 | 83325 | 6 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 3333 | 83325 | 6 (0)| 00:00:01 |
| 2 | TABLE ACCESS BY INDEX ROWID| PARENT | 1 | 12 | 1 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | PARENT_ID_IX | 1 | | 0 (0)| 00:00:01 |
|* 4 | TABLE ACCESS FULL | CHILD | 3333 | 43329 | 5 (0)| 00:00:01 |
Predicate Information (identified by operation id):
3 - access("P"."PARENT_ID"='parent_1')
4 - filter("C"."PARENT_NUM"="P"."PARENT_NUM")
Execution Plan
Plan hash value: 4033709836
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 3333 | 83325 | 6 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 3333 | 83325 | 6 (0)| 00:00:01 |
| 2 | TABLE ACCESS BY INDEX ROWID| PARENT | 1 | 12 | 1 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | PARENT_ID_IX | 1 | | 0 (0)| 00:00:01 |
|* 4 | TABLE ACCESS FULL | CHILD | 3333 | 43329 | 5 (0)| 00:00:01 |
Predicate Information (identified by operation id):
3 - access("P"."PARENT_ID"='parent_5')
4 - filter("C"."PARENT_NUM"="P"."PARENT_NUM")
column table_name format A10
column column_name format A11
column endpoint_actual_value format A21
select * from user_tab_histograms where table_name='CHILD' and column_name='PARENT_NUM';
TABLE_NAME COLUMN_NAME ENDPOINT_NUMBER ENDPOINT_VALUE ENDPOINT_ACTUAL_VALUE
CHILD PARENT_NUM 1 1
CHILD PARENT_NUM 9999 5
CHILD PARENT_NUM 10000 10
3 rows selected.
I am sorry about the formatting but this is the best I could following plain text help.
Thank you,
Eugen
Edited by: Eugen Iacob on Dec 13, 2011 3:21 AM
Edited by: Eugen Iacob on Dec 13, 2011 12:36 PM
Edited by: Eugen Iacob on Dec 13, 2011 12:37 PM
Edited by: Eugen Iacob on Dec 14, 2011 2:13 AM

Hi,
you can create a function based index on child table, and query that value instead of parent_id from parent table.
SQL> select * from v$version;
BANNER
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
CORE     10.2.0.1.0     Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
CREATE TABLE parent AS SELECT LEVEL parent_num, 'parent_' || LEVEL parent_id, 'some text ' || level parent_name
FROM DUAL CONNECT BY LEVEL <= 10;
ALTER TABLE parent ADD CONSTRAINT parent_pk PRIMARY KEY (parent_num);
CREATE UNIQUE INDEX parent_id_ix ON PARENT (parent_id, parent_num);
CREATE TABLE child AS SELECT DECODE (LEVEL, 1, 1, 10000, 10, 5) parent_num, 'child_' || LEVEL child_id,
'some text ' || level child_name
FROM DUAL CONNECT BY LEVEL <= 10000;
ALTER TABLE child ADD FOREIGN KEY (parent_num) REFERENCES parent (parent_num) ON DELETE CASCADE;
CREATE INDEX child_parent_num_ix ON CHILD(parent_num);
CREATE OR REPLACE function get_parent_id( in_parent_num in number )
RETURN parent.parent_id%TYPE
DETERMINISTIC
IS
ret parent.parent_id%TYPE;
BEGIN
SELECT parent_id INTO ret
FROM parent
WHERE parent_num = in_parent_num;
RETURN ret;
END;
CREATE INDEX child_parent_id_idx ON child( get_parent_id( parent_num ) );
exec dbms_stats.gather_table_stats(ownname=>user,tabname=>'CHILD',estimate_percent=>100,cascade=>TRUE,method_opt=>'FOR ALL HIDDEN COLUMNS');
explain plan for
SELECT p.parent_name, c.child_name
FROM child c, parent p
WHERE c.parent_num = p.parent_num AND get_parent_id(c.parent_num ) = 'parent_1';
select * from table( dbms_xplan.display );
plan FOR succeeded.
PLAN_TABLE_OUTPUT
Plan hash value: 3790918082
| Id | Operation                    | Name                | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                     |     1 |    77 |     3   (0)| 00:00:01 |
|   1 | NESTED LOOPS                |                     |     1 |    77 |     3   (0)| 00:00:01 |
|   2 |   TABLE ACCESS BY INDEX ROWID| CHILD               |     1 |    37 |     2   (0)| 00:00:01 |
|* 3 |    INDEX RANGE SCAN          | CHILD_PARENT_ID_IDX |     1 |       |     1   (0)| 00:00:01 |
|   4 |   TABLE ACCESS BY INDEX ROWID| PARENT              |     1 |    40 |     1   (0)| 00:00:01 |
|* 5 |    INDEX UNIQUE SCAN         | PARENT_PK           |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   3 - access("TEST"."GET_PARENT_ID"("PARENT_NUM")='parent_1')
   5 - access("C"."PARENT_NUM"="P"."PARENT_NUM")
Note
   - dynamic sampling used for this statement
22 rows selected
explain plan for
SELECT p.parent_id, c.child_id
FROM child c, parent p
WHERE c.parent_num = p.parent_num AND get_parent_id(c.parent_num ) = 'parent_5';
select * from table( dbms_xplan.display );
plan FOR succeeded.
PLAN_TABLE_OUTPUT
Plan hash value: 2656363181
| Id | Operation          | Name         | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |              | 9998 |   732K|    23 (27)| 00:00:01 |
|* 1 | HASH JOIN         |              | 9998 |   732K|    23 (27)| 00:00:01 |
|   2 |   INDEX FULL SCAN | PARENT_ID_IX |    10 |   380 |     1   (0)| 00:00:01 |
|* 3 |   TABLE ACCESS FULL| CHILD        | 9998 |   361K|    21 (24)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - access("C"."PARENT_NUM"="P"."PARENT_NUM")
   3 - filter("GET_PARENT_ID"("C"."PARENT_NUM")='parent_5')
Note
   - dynamic sampling used for this statement
20 rows selected

How to create a foreign key for the table from two different tables?

Hi All,
I have a three table like below. In the below table SAMPLE_CONS_CHECK and SAMPLE_CONS2_CHECK will be having the primary key for NAME column. The same SAMPLE_CONS3_CHECK table also having the primary key for NAME column and forieign key for SAMPLE_CONS_CHECK and SAMPLE_CONS2_CHECK tables. See the below code 2
code 1:
CREATE TABLE SAMPLE_CONS_CHECK
        (NAME VARCHAR2(10),
        SERIES VARCHAR2(5)
CREATE TABLE SAMPLE_CONS2_CHECK
        (NAME VARCHAR2(5),
         MODEL NUMBER
CREATE TABLE SAMPLE_CONS3_CHECK
        (NAME VARCHAR2(5),
         MODEL_NO NUMBER
        )code 2
alter table SAMPLE_CONS_CHECK
add constraint SAMPLE_CONS_CHECK_pk primary key (NAME)
alter table SAMPLE_CONS2_CHECK
add constraint SAMPLE_CONS2_CHECK_pk primary key (NAME)
alter table SAMPLE_CONS3_CHECK
add constraint SAMPLE_CONS3_CHECK_pk primary key (NAME)
ALTER TABLE SAMPLE_CONS3_CHECK ADD
CONSTRAINT SAMPLE_CONS3_CHECK_FK1 FOREIGN KEY
     NAME
) REFERENCES SAMPLE_CONS_CHECK
    NAME
) ON DELETE CASCADE;
ALTER TABLE SAMPLE_CONS3_CHECK ADD
CONSTRAINT SAMPLE_CONS3_CHECK_FK2 FOREIGN KEY
     NAME
) REFERENCES SAMPLE_CONS2_CHECK
    NAME
) ON DELETE CASCADE;From the above schenario i am able to insert the data to SAMPLE_CONS3_CHECK table. But the parent data is already available in the parent table. The problem is here two different constarints from two different tables. While inserting, it is checking from both the tables whether the parent is exist or not.
How can i solve this problem? Can anyone halp me about this?
Thanks
Edited by: orasuriya on Aug 8, 2009 2:02 AM

Actually the design is completely incorrect.
What you say is
I have
'foo', 'foo series'
'foo','foo model'
'foo',666
By virtue of table3 referring to both table1 and table2.
This means you actually need to have 1 (one) table:
'foo','foo series','foo model', 666
And the 'problem' disappears.
Sybrand Bakker
Senior Oracle DBA

How to use Concatenation option in Foreign Key

Hi,
I have 2 tables.
Master Table : Father(a varchar2(10),b varchar2(10)
Child Table : Child (c varcahr2(20))
In the child Table i have stored the following Father.A||Father.B
Child.C = Father.a + Father.B
I want to create a Foreign Key Relation for this.
I cant use '||' option.
Can any one please guide me.
ALTER TABLE child ADD CONSTRAINT fk_child FOREIGN KEY (c) REFERENCES father(a||b)
ON DELETE CASCADE;
This statement throws error.
Pls help me in this

Why not create a third column on the Master table ?
alter table Father add c varchar2(20);
-- then perform an update
update Father set c := a|| b
commit
/and then create the constraint as;
ALTER TABLE child ADD CONSTRAINT fk_child FOREIGN KEY (c) REFERENCES father (c) ON DELETE CASCADE;

How to alter the constraint for on delete cascade

Hi Guys,
I have a table which has 5 level of child tables .But all the child tables have the foreign keys without on delete cascade.But I have to delete a data in the parent table .One method I thought to change the child table constraints to ON DELETE CASCADE then delete the record and after that again to change the constraints with out the ON DELETE CASCADE.Please let me know wheather these is possible or not .If not is there any other alternatives to achive this.
Any suggestions would be highly appreciated.
Thanks in advance
Prafulla

I think you need to drop and recreate your FKs.
See my example here.
create table TEST1
id NUMBER(12) not null,
anything VARCHAR2(20)
alter table TEST1
add constraint PK_TEST1 primary key (ID);
create table TEST2
id2 NUMBER(12) not null,
fk1 NUMBER(12),
info VARCHAR2(50)
alter table TEST2
add constraint PK_TEST2 primary key (ID2);
alter table TEST2
add constraint FK_TEST2_TO_TEST1 foreign key (FK1)
references TEST1 (ID);
-- and here is the code when I add on delete cascade for FK
alter table TEST2
drop constraint FK_TEST2_TO_TEST1;
alter table TEST2
add constraint FK_TEST2_TO_TEST1 foreign key (FK1)
references TEST1 (ID) on delete cascade;

Problem on DELETE CASCADE

my following tables not allow me to delete the parent table student and the corperate recode in child table also get delete , why
create table Student( student_id int(10) not null , sure_name VARCHAR(25) not null, english_name Varchar(25) default null, chinese_name varchar(35) CHARACTER SET utf8 COLLATE utf8_general_ci not NULL, student_hkid varchar(12) not null, address varchar(100) default null, mobile_No varchar(15) default null, home_Telephone varchar(15) default null, email varchar(20) not null, faculty varchar(70) default null, department varchar(100) default null, local_student varchar(3) default 'No', fresh_student varchar(3) default 'No', fulltime_student varchar(3) default 'No', first_Ustudent varchar(3) default 'No', userIp VARCHAR(45) not NULL, accessTime VARCHAR(45) not NULL, primary key(student_id))TYPE=MyISAM CHARACTER set utf8; create table Student_financial_info( student_id int(10) not null, grant_loan varchar(3) default 'No', uploadfile text default null, notification_time varchar(10) default null, father_name varchar(25) default null, father_HKID varchar(12) default null, father_Salary decimal(6,2) , father_live_together varchar(3), mother_name varchar(25) default null, mother_HKID varchar(12) default null, mother_Salary decimal(6,2) , mother_live_together varchar(3), 1th_sibling_name varchar(25) default null, 1th_sibling_HKID varchar(12) default null, 1th_sibling_Salary decimal(6,2) , 1th_sibling_together varchar(3), 2th_sibling_name varchar(25) default null, 2th_sibling_HKID varchar(12) default null, 2th_sibling_Salary decimal(6,2) , 2th_sibling_together varchar(3), 3th_sibling_name varchar(25) default null, 3th_sibling_HKID varchar(12) default null, 3th_sibling_Salary decimal(6,2) , 3th_sibling_together varchar(3), 4th_sibling_name varchar(25) default null, 4th_sibling_HKID varchar(12) default null, 4th_sibling_Salary decimal(6,2) , 4th_sibling_together varchar(3), addition_income Varchar(200) default null, primary key(student_id ), FOREIGN KEY(student_id) REFERENCES student(student_id) ON DELETE CASCADE ON UPDATE CASCADE)TYPE=MyISAM CHARACTER set utf8;

HJava wrote:
hi thank you!
I change my table Engine under Mysql Query Browser, but Foreign Key settinis not action at all ( thank you you mention the foreign key is ignore), quite stronge for me, I have to drop the table and change the table engine to InnoDB in my create table code and run it under command line client,
now, It work.
are there any different to use command line Client and Mysql Query Brower?
thank you!Not really, other than appearance. But, the "GUI" might let you simply change the type of table on an already created database (I don't know, haven't tried it), unfortunately, that won't activate any foreign keys when changing a MyISAM to InnoDB (although it will destroy keys on an InnoDB when changing to MyISAM), as, like the above quote says, the keys are not only not used, they are not even stored. I.E. MySQL no longer even knows, nor cares, that you even attempted to create a foreign key for that table. So, you must drop and recreate the table, you can't simply "change" it. Although you could change it (if the GUI even does this) and then add the foreign key constraints.

Add ON DELETE CASCADE

hi every body.
i want to add the constraint "ON DELETE CASCADE" on foreign key value in child table like.
ALTER table employee
Add CONSTRAINT cscade_dept_no ON DELETE CASCADE (Deptno)
but it display error message, so please help me in this regards.
Thanks
Edited by: BilalKhan on Feb 7, 2011 11:53 PM

Usually, will be usefull look the error displayed.
Example:
ALTER table employee Add CONSTRAINT cscade_dept_no ON DELETE CASCADE (Deptno);
Error SQL: ORA-00904: :
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:Then we can say to you... Your syntaxis is wrong, you must use
ALTER TABLE table_name
add CONSTRAINT constraint_name
FOREIGN KEY (column1, column2, ... column_n)
REFERENCES parent_table (column1, column2, ... column_n)
ON DELETE CASCADE;
example
ALTER TABLE employee
add CONSTRAINT cscade_dept_no
FOREIGN KEY (Deptno)
REFERENCES Department (Deptno)
ON DELETE CASCADE;

Can't Delete Parent Record - On Delete Cascade is set

Greetings all,
I have a parent and child table and when I attempt to delete the parent record, I get the following error:
ORA-02292: integrity constraint (WFSTEADMAN.INCIDENT_NOTES_TBL_FK) violated - child record found
     Error      Unable to process row of table MYTEST_INCIDENTS.
I have the the FK set to ON DELETE CASCADE so I am not sure what the issue might be.
Below are the structures of my parent and child tables:
I am using apex.oracle.com so the version is: Application Express 4.0.2.00.06
Any assistance would be appreciated.
Wally
PARENT TABLE:
=============================================================
CREATE TABLE "MYTEST_INCIDENTS"
(     "INCIDENTID" NUMBER NOT NULL ENABLE,
     "INCIDENTCREATED" DATE NOT NULL ENABLE,
     "INCIDENT_OWNER" VARCHAR2(200) NOT NULL ENABLE,
     "DTGSTART" DATE NOT NULL ENABLE,
     "DTGEND" DATE,
     "INCIDENT_SERVICES" VARCHAR2(4000),
     "INCIDENT_CUSTOMERS" VARCHAR2(4000),
     "INCIDENT_DESCRIPTION" VARCHAR2(4000),
     "INCIDENT_TIMELINE" VARCHAR2(4000),
     "INCIDENT_TRACKING" VARCHAR2(500),
     "INCIDENT_RESTORE" VARCHAR2(4000),
     "INCIDENT_FOLLOWUP" VARCHAR2(4000),
     "INCIDENT_LEVEL" NUMBER,
     "INCIDENT_TITLE" VARCHAR2(500),
     "EMAIL_NOTIFY" VARCHAR2(4000),
     "TEXT_NOTIFY" VARCHAR2(4000),
     "LEVEL_TYPE" VARCHAR2(25),
     CONSTRAINT "MYTEST_INCIDENTS_PK" PRIMARY KEY ("INCIDENTID") ENABLE
CREATE OR REPLACE TRIGGER "BI_MYTEST_INCIDENTS"
before insert on "MYTEST_INCIDENTS"
for each row
begin
if :NEW."INCIDENTID" is null then
select "MYTEST_INCIDENTS_SEQ".nextval into :NEW."INCIDENTID" from dual;
end if;
end;
ALTER TRIGGER "BI_MYTEST_INCIDENTS" ENABLE;
CHILD TABLE
=============================================================
CREATE TABLE "MYTEST_INC_NOTES"
(     "NOTEID" NUMBER NOT NULL ENABLE,
     "INCIDENT_ID" NUMBER NOT NULL ENABLE,
     "NOTE_DTG" DATE,
     "NOTE_OWNER" VARCHAR2(200),
     "NOTE_COMMENTS" VARCHAR2(4000),
     CONSTRAINT "MYTEST_INC_NOTES_PK" PRIMARY KEY ("NOTEID") ENABLE
) ;ALTER TABLE "MYTEST_INC_NOTES" ADD CONSTRAINT "MYTEST_INC_NOTES_CON" FOREIGN KEY ("INCIDENT_ID")
     REFERENCES "MYTEST_INCIDENTS" ("INCIDENTID") ON DELETE CASCADE ENABLE;
CREATE OR REPLACE TRIGGER "BI_MYTEST_INC_NOTES"
before insert on "MYTEST_INC_NOTES"
for each row
begin
if :NEW."NOTEID" is null then
select "MYTEST_INC_NOTES_SEQ".nextval into :NEW."NOTEID" from dual;
end if;
end;
ALTER TRIGGER "BI_MYTEST_INC_NOTES" ENABLE;
CREATE OR REPLACE TRIGGER "MYTEST_INC_NOTES_T1"
BEFORE
insert or update on "MYTEST_INC_NOTES" REFERENCING NEW AS NEW OLD AS OLD
for each row
begin
:NEW.NOTE_DTG := SYSDATE;
end;
ALTER TRIGGER "MYTEST_INC_NOTES_T1" ENABLE;

Yeah there was a rampant child table still left out there. Noticed the issue and deleted the child and all is well now. :). Should have looked for a couple more minutes before posting.
Thanks
Wally

FOREIGN KEY across 2 schemas with ON DELETE CASCADE

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