Luchino - Samel wrote:
*Question No. 01*
there are some kind of foreign key in database
Some of them want give any error when you delete from the table where the
foreign key is in, this cause the remove is "recursive" and it delete
also
the ORDER linked to the CUSTOMER (CASCADE foreign key).
In other kind of foreign key (I don't remember the name) you cannot
delete
CUSTOMER if there is some ORDER linked to them.
restrict
hope this will help
c-ya
2007/3/26, Lasitha Alawatta <[EMAIL PROTECTED]>:
Hello,
I have 2 issue, regarding MySQL "Foreign Key".
I have two tables;
Table 01 *CUSTOMER*
column name
characteristic
SID
Primary Key
Full_Name
Table *ORDERS*
column name
characteristic
Order_ID
Primary Key
Order_Date
Customer_SID
Foreign Key
Amount
When I run "ALTER TABLE ORDERS ADD FOREIGN KEY (customer_sid) REFERENCES
CUSTOMER(SID);" that sql statement,
I inserted 2 records to both tables.
* *
*Question No. 01.*
Then I removed 1 record from CUSTOMER table. But It want give any error
message. It should give an error message, because in ORDERS table
already
have some records relevant to the deleted customer record in CUSTOMER
table.
you have restrict constraint on Customer_SID in table orders. You have 2
options:
1. delete from orders where Customer_SID=foo
delete from customer where SID=foo
2. read
http://dev.mysql.com/doc/refman/5.1/en/innodb-foreign-key-constraints.html
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